Category: Software

Color separations for knits_ Mac Numbers(3), some Excel

Double jacquard in 2 colors is a good place to start sorting out color separations. There are many methods for this. Japanese electronic machines and Passap tech 179 use a split row 1, col 1 method, which provides the least elongation of motifs upon knitting the piece. For some how-to and problems with these separations and knitting them please see this post. Getting familiar with the tools makes it possible to in turn separate colors for fabrics other than DBJ. The working area needs to be considerably larger than the original design repeat for moving segments of charts around. Some of the changes made to the original design area affect the spreadsheet across all rows (or if applicable, columns) in that area, and copying and pasting in other parts of the table, outside those spreadsheet rows does not do so by default. A 2 col motif will require 4 rows for each row knit (unless one is using double length in machines capable of it), so a 20-row motif would require at least 80 for the fully expanded separation. When I began experimenting I worked on multiple page spreadsheets, with multiple projects within the same document. I would suggest single project documents/ tables, however, so that inserting rows in either excel or numbers does not “accidentally” alter other projects that are saved, within the same row range, but out of working view. Both programs export to PDF and other file formats. Selective screen grab can capture segments for saving, scaling, or printing. Mac users have multiple options built-in for screen grabs. UPDATE July 12, 2014: the table split into rows command is gone from numbers version 3.0+

SPLIT INTO ROWS, ERASE

Begin with a small motif (even # colors per row, in this case, 2) that has been tested for repeats lining up correctly

select, copy and paste single repeat: this can be done through menu options or simple use of command C, command V (Mac)

choose color 1, and color 2 for the order of separation. In DBJ in most instances, it is best to begin the knit with the largest # of stitches in any one color, the reverse of the blue/yellow below in my chart below.

A: motif pasted, selected, Table menu select split into rows. Selecting and pasting the same motif just created on the same rows but different columns will copy its format A2 while going outside those rows in the document, copying the original size motif and pasting in adjoining rows to split ones will bring with it that format, seen in A3

B: copy and paste A (split rows) below its image/row range, motif will take on the formatting of that section of the document, resulting in large working squares once again

C: purple squares act as markers for odd rows, white for even. Chosen color (here = yellow) 1 will be “erased” on row one and odd-numbered rows (purple marker), and color 2 (blue) erased on even-numbered rows (white marker square). One of the ways to achieve this is to select cells to be erased, followed by clicking on fill-in format bar, and choosing no fill or white. Separation may be visually checked: if colored rows were to tumble down on each other, there should be no overlap of different colored squares. Colored squares punched or programmed using this illustrated method require elongation X2

D: C is split once again. This separation may be knit as is on any machine capable of the repeat width, without elongation. I prefer to avoid using double length in my knits if I can, find that makes it easier for me to accurately return to rows when unraveling and returning to any rows after errors in knitting

SPLIT ROWS (Numbers, eliminated in later releases)_INSERT ROWS (Excel)

NUMBERS: any # colors per row: SELECT, INSERT COPIED ROW

select motif, paste again in an area of document outside those rows

select single row of colors beginning at either top or bottom of motif, use Insert_copied rows, in this case, each row needs to be expanded to 3, one for each color

starting at bottom inserts rows below, starting at top inserts rows above

repeat the process for one row at a time, for number of rows required

here 3 cols per row, each row needs to be expanded to 3, so insert row is used X2 for each color

when the expansion is complete proceed with “erasing” as described in 2 col chart above, erasing first col 1, then col2, then col 3 for each row

use separation as is elongate X2, or split again for knitting without elongation

EXCEL_INSERT ROWS

yellow squares indicate starting and ending points for inserting rows; click on any square within a row, a row will be added across the whole document, copying the colored squares in the row above; I began on row 8, working my way down, stopping at row numbered one will have one row missing in elongated repeat on right; yellow squares are markers /reminders for beginning and ending row insertion commands

3 colors, separation requiring elongation for knitting

Both programs have options for changing viewing magnification, so grids may be of one size to start with, and viewed as preferred. This is also helpful in scaling screen grabs. The excel menu bar has a paint bucket that may be be used for coloring cells selected both singly and in groups.

INSERT COLUMNS

Split the column and insert copied column (numbers) will aid when wanting to chart twice as wide; in excel: insert column on the blank square to the left of motif will insert a blank column in that area throughout the document; same command beginning on the right of the first colored square on the left, or of the last colored square on the right, will repeat the colors in the motif, adding blanks to the remaining “squares” for that whole column in the document

NUMBERS

A: original motif, B: split columns for twice the width, selected and pasted elsewhere for C, inserting rows, rendering it also twice as long

the image below shows some of what can happen when any motif is repasted in areas affected by its new formatting ie. rows split at the bottom in E, columns split to the right of A, and if table column and rows are added by dragging on the “handle” on the document’s bottom right, colored squares are copied and extended into stripes. Unwanted areas of color may be selected, using Edit_ clear all will remove the colors, leaving the border lines intact

to remove text: select affected cells, use Edit_Delete

EXCEL



orange squares show sequence used: in order from left to right, beginning with selecting # 1, insert a column, working across the repeat, resulting in twice as wide.

tools are often self-evident, and experimentation helps sort out a way of working so they become familiar, and one may sort out of the many ways that are often available to complete the same task what is the easiest for them

both programs have options for changing viewing magnification, also helpful in scaling screen grabs

to my knowledge there is not a way when there are 2 colors in any one row to swap them for each other, even with formulas and rules, a feature that would be very convenient in other types of color separations.

Charting knits using Mac Numbers program 1

A free manual for the program may be obtained via Apple, with extended documentation. I thought I would share some of my notes in trying to work with it in creating knit charts. They are not intended as complete tutorials, but simply perhaps as a place to start for those owning the program. Having some familiarity with excel makes some things easier, Numbers reads Excel documents already created, will save/export files in its format as well

to create a chart: open a new document, a table will appear with wide, rectangular cells which will need to be readjusted

clicking on the square with 9 dots to the left of column A will highlight the whole sheet

the formatting bar

click on inspector (white i in blue dot) located above format bar

adjust column width and height to .4 and .4 or desired values hit return

click on the screen and a resized document will appear

drag on symbol  small rectangle with 6 dots (upper right, bottom left, marked A and B) to  increase # of column or rows, or copy and paste as they are needed

there are many ways to add color described in the manual in multiple contexts. For this purpose, I like to begin by creating a palette within the working table. To do so click on an individual cell, go to fill in the menu bar,

click on it, choose a color from the window that appears, select color, the cell will fill with color, having a palette within the document will save confusion, and save trips back and forth between

repeat until you have a row of chosen trial colors, same can be done with font symbols or numbers for easy access throughout the process, I have created a master document with all symbols in fonts I like to use to the left of the table,  in sizes suited for the working cells, for easy copy and paste as well

copy the individual color (cell) will work with paste  to place color in the design motif area, dragging the handle at the bottom right of the paste will produce single cells, rows, columns, or squares/ rectangular shapes in that color

copy and paste motif created both to change color segments, and to test motif repeat alignment

isolate final repeat for actual knitting, programming, or punching

Borders

here I miss the pencil drawing option in excel; a tutorial on border drawing Numbers, and some illustrations  using the motif in the downloadable document (post1) with variations

using select, copy, paste; border markings  illustrated

altering the repeat to a dropped one

brick stitch_ easy changing to visualize shifts in the pattern

Charting knits in Excel.

I began using the program for this purpose in 2009 and continued to in nearly all the colored charts in my color separations for knits posts since then. Gimp offers a whole other series of options for knitters in BW with magnification as seen in more recent posts here. I thought I would revisit some of the tutorials written by several other knitters prior to more posts of my own on using Numbers for anyone having Excel available to them. They are in no particular order. Marnie’s and Fleegle’s blogs offer tips, techniques, and how-tos in a series that I found extremely helpful when I began my own spreadsheet journey.

http://fibremuse.blogspot.com/2009/02/charting-patterns-with-excel-part-1.html

http://marniemaclean.com/blog/tutorials.html#.Um_-wpFQY7I

http://www.chemknits.com/2010/01/how-to-make-knitting-chart-in-excel_9394.html

http://fleeglesblog.blogspot.com/search?q=charting+with+excel

http://anniebeeknits.wordpress.com/2011/06/06/charting-in-excel/

http://www.youtube.com/watch?v=T9dwuarghqE

Charting knits using Mac Numbers: color separations 1

A lot has been written on the use of excel in knit charting, I don’t believe there is anything “out there” on doing the same with Numbers. After my latest OS upgrade, I thought I would revisit playing with the updated program. This is not a tutorial as such, just a sharing of some results and observations on this particular effort. For the design, I used the same motif as in the last post on 2 color drop stitch on Japanese machines. Under the table menu, there is an option to split rows or split columns. This can be achieved in any selected area, without affecting the remainder of the spreadsheet. Copying and pasting the split image over an area of full-size cells will change its format, and in turn, allow for splitting again. In the image below A is the original motif, B the first split after selecting only those colored cells, C repasting B in an area of full-size cells, D selecting and splitting C to achieve elongating the original motif X 4.

to separate the colors for the 2 color drop stitch using white “erase” every other row: these rows will result in no pattern selection, and will be the rows on which stitches are dropped. Select and copy and paste again. Choose either of the 2 colors and white-out that color (I chose to start with cyan) on the first and then every other colored combination row. Note there are 3 blank rows between each “erasure” after the first. Once the process is completed to the top of the design, select, copy, and paste again. On alternate rows that are still in 2 colors, the magenta can now be whited out, and this repeat when complete, visually be checked for any errors. Colored squares remaining in either color now translate to punched holes or black squares on mylar depending on the size of the original motif

This particular method works on even motifs with an even number of colors, as splits double existing rows. Row and stitch numbers, text, etc may all be added. The image below does not refer to color separations. It illustrates the ability to go twice as long, twice as wide through using splitting rows, and in turn, splitting columns. Twice as wide used alone comes in handy for any knitting on every other needle, sometimes used for thicker yarns on the standard machines that do not have the ability to do that via electronic programming.

WordPress will not allow uploading a numbers document; here is a numbers document exported as excel .xls  that should open in Numbers on a Mac for anyone wanting to play with charting a bit. The extra color square on the far right is a “place holder” of sorts, needed to avoid cropping of all empty cells to the right of the motif in the software’s exporting the file  numbers_test_doc

4/30/2018: the feature described below in 2012 disappeared from later versions of numbers, I am presently using version 5.0. Later versions offered these options for working with rows and columns. The highlighted row will be duplicated, a slower process than simply splitting cells. A positive feature is that an individual table may be changed while still within view on other tables on a single sheet, without globally affecting the document. 

While playing with more table options today I sorted out a way of creating blank rows between design ones, possible charting uses still TBD. Though the results from such charting are not capable of being downloaded directly into knitting software, they are a good way to sort out repeats and begin to understand and create any necessary color separations. By holding the command key, rows on the table can be highlighted and hidden as a group. I chose all the even-numbered rows. The repeat then is drawn. When it is complete, rows originally targeted for hiding are “unhidden”, leaving the design motif with a blank row between each design row, at twice its length. Hiding could take place at irregular intervals as well. 

December 8, 2012: in writing my latest post I found an easier way to deal with split rows and columns. If the motif area is copied and pasted on a “blank” part of the spreadsheet a new table is created, which can be altered without concerns about affecting the remainder of the document. It’s like working with small pieces of graph paper rather than a very large one. The motif area is chosen and pasted, creating a new table

the table, split into row option is used

simply select all, click on the line at bottom of any numbered, grey row cell on the left of the table, and resize to match the remainder of your document, when the desired measurement is achieved, release the mouse and the document cells will be uniform in size.

the same process may be applied to split columns, may well have to try this on some of my huge excel charted spreadsheets

Drop stitch lace, 2 colors per row, japanese machines

This is an attempt to duplicate the results of Passap tech 185 used in knitting multiple colors per row drop stitch “lace” fabrics.
The method may also be used for more colors per row, expanding the repeats accordingly to the number of colors per row X 2 for each motif row. For example, here 2 colors per row are expanded to 4 rows for each color in length, 3 cols per row would need to be expanded to 6 for each design row.
This fabric widens considerably when completed, so at the top and bottom edges, cast ons and bind offs, need special consideration and planning.

In this instance, the design has been separated for the dbj method wherein each color in each design row knits twice. The second row in each pair of rows is then cleared of any pixels which results in no needle selection, providing an opportunity for the loops formed on the main bed to be dropped with the assistance of a stitch ditcher.
The fabric may also be executed using the original separation, but the opportunity to use an accessory to facilitate stitch dropping is lost’
The method for swatching: cast on for every other needle rib, knit 2 circular rows followed by one row of all knit rib, and transfer all main bed stitches to the ribber. For an open stitch cast on directions and photos see later post.
COR Set up needles on both beds for every needle rib with an extra needle in work at each end on the main bed, cancel end needle selection (KC II). With the main bed needles in the B position, set the knit carriage to slip in both directions so as not to pick up loops across the whole row as the first pass toward the color changer is made, needles will be preselected for the first pattern row
COL: the ribber remains set to knit every needle, the main bed to slip in both directions. A piece of tape in front of needle butts of needles in A position aside from the edge needles in work helps keep from accidentally moving extra needles into work when dropping whole rows of stitches
change color, as the carriage moves to the right, selected needles will pick up loops on the main bed that will form the long stitches when dropped, while the next row of pattern is selected, so by the time the carriage has reached the right side of the machine, needles will have flatlined due to the all blank rows in this type of color separation
COR: use any convenient tool to bring all needles involved out to E, and use the same tool to return all stitches back to the B position, dropping the loops on the main bed which will form the long stitches. With this type of color separation, it is also possible to use a modified Studio P slider Directions on altering the studio tool for use on Brother machines to drop stitches from right to left before continuing to knit.
Check that all needles are empty and that loops free and between the beds.
As the carriage moves to the left again toward the color changer, the ribber only will knit all stitches (does so every row), needles will be preselected for the next row of long stitches, selected needles are not knitting.
Colors are changed every 2 rows
The pattern and the “color separations”, were achieved using GimpImages from left to right
1. motif  lengthened X 4
2. every other row erased (non-selection rows)
3. 2nd pattern row (every other row of design now left) color inverted
4. pattern marked in 5X5 blocks for easier tracking when drawing on the 910 mylar sheet
A downloadable PDF of basic info 185_brother
sideway views: knit side purl side The emerging pattern can be seen, and to be noted is the elongation factor involved as in many color separation DBJ fabrics
For a later review of cumulative posts on the topic see: revisiting drop stitch lace 
For the design method for staggered shapes in drop stitch see Ayab software-related post.
In other electronics, a single repeat in both height and width is adequate and machine selections will determine whether the design is knit as a single motif or as all-over patterns.
Ayab’s preselection is always from left to right. In unhacked 910s, the first preselection row can be from right to left, so no accommodations need to be made for shifting the last row to the first of the design repeat.
For machines accepting electronic downloads, program the repeat with the first design row containing black squares in it, and adjust the spacing between repeats as preferred. This particular version is 80 stitches wide In an unaltered 910 with the ability to double the width of the programmed repeat, mylar users are not excluded from exploring a similar fabric. The repeat above may be rescaled to half the width,  drawn that way, and then use the twice as wide built-in feature. In Gimp scaling this design to half-width, note the right side of each repeat contains an odd number of squares, the left side an even one. The repeat may be used as-is or redrawn, adding or eliminating black squares if symmetry in each shape matters. The free program Paintbrush produces the same image, mirrored.
The explanation: further analysis of the original design reveals the fact that some of the pixel numbers in the design black square blocks are uneven in width. In this instance, 3.5 is half of 7, and half pixels cannot be rendered, so the software assigns the split to 4 and 3.
A Passap sample

Online Pattern generators, hacks, free KM manuals, and more

I welcome being contacted re any problem links
generators that require color changing every 2 rows using a color changer (or 2 carriages)
mazes on gridded output, easily adaptable to knit http://www.ludiculus.com/maker/mazes.html
more mazes  http://www.billsgames.com/mazegenerator/
maze pattern http://www.unikatissima.de/e/?page_id=2062 blog closed 
cellular automaton http://www.unikatissima.de/e/?page_id=2148 blog closed  
Some unikatissima blog content may be found here, but generators fail as they relied on Flash Player, now defunct mosaic knitting
other generators that can help with shaping garments, or some basic knit motif design
Truchet tiles generator https://dmackinnon1.github.io/truchet/gen.html
knitting pattern http://kpg.sourceforge.net
top-down circular raglan calculator http://kpg.sourceforge.net
Icelandic round yoke design does not work any longer in later version browsers, on Mac even with the installation of Silverlight, on Ravelry, it was noted the program does operate in Internet Explorer http://knittingpatterns.is/#/Design
random square patterns http://www.unikatissima.de/e/?page_id=3638  blog closed

Random Stich lace pattern generator
https://www.knittingfool.com/Reference/LacePatternGenerator.aspx
Text to binary converters
1 https://www.prepostseo.com/tool/text-to-binary-converter,
2 https://www.convertbinary.com/text-to-binary/
3 https://codebeautify.org/text-to-binary

punchcard generator and how to use videos
https://patternpunchknit.com/  beta online tool 11/2022 https://brendaabell.com/knittingtools/pcgenerator/
https://www.youtube.com/watch?v=vBSVIJsSux4
https://www.youtube.com/watch?v=4rUBb6IUce0  English version
https://www.youtube.com/c/knitlabo/videos?view=0&sort=dd&shelf_id=1
https://www.youtube.com/watch?v=d8KvFiklGTE

math calculators for knitting
free online manuals, magazines
machineknittingetc.com now https://mkmanuals.com/
hacking
a hacking history https://www.beautifulseams.com/2014/10/29/tricodeur-writeup/
only the intro is in German: a nearly hour-long presentation by Fabienne
another approach for Brother models KH”‘930, 940, 950i, and 970: http://daviworks.com/knitting/ and the associated group on Ravelry 
970 how to hack instructable 
for additional cumulative information, software compatibility and hardware specs see Claire Williams’ website
GitHub
PatternUploader
color reductions/ conversions for large, nonrepetitive images Mac
Splitting large images into multiple segments, a free online tool
https://pinetools.com/split-image
online dither generators
https://ditherit.com 9 dithering types
https://app.dithermark.com  a huge range of possibilities
Hand knitting websites worth a browse:
https://www.knittingfool.com/Pages/Reference.aspx
pattern generators/ web design
open-source charting program http://sourceforge.net/projects/sconcho/
quick screenshot

1/21/2016: Online weaving program by Andrew Glassner ; associated blogpost 

11/26/17 a simple, user-friendly free motif design paint program for Mac, last updated April 2019: Paint Brush

Atkinson dither github (free)

I have linked before (March 14, 2013) to this github as a way to achieve atkinson dithered images for possible use in knitting. I received a post with questions on how to achieve this successfully. I work on a Mac, latest OS. The resulting dithered files were not read when downloaded by any app other than Preview, and resizing within program was poor quality. Here is my work-around: it is always best to resize any of the images to be processed in color or grey scale, before indexing modes or dithering. Once that is achieved, import image into github without changing output size in the program itself, and download. Your own image size will be retained. Now time for another freebie intervention: XnConvert will accept the file, convert it to BMP or other readable formats if preferred, resulting in a knittable image.

the sized image

hyperdithered.png

via github_XnConvert_.bmp

…

Converted images,”representational knitting”

One bit camera “snaps pictures in digital retro style. I began this tale with a partial shot of my face. The app apparently is no longer available via US App Store (11/15/2017)

resized, greyscale, knittable size bmp

The old bag of tricks did not produce an image I was happy with, I finally used Ggraphicconverter Picture_Mode_ Bitmap for my downloadable file

Migrated from Mac to a PC laptop, opened in WinCrea, the image repeat was downloaded to Passap, program tech 179. The bottom  of the swatch is knit single bed LX (slip stitch), the top is double bed, back bed set N/N, same tension throughout, the middle stripes are operator error in forgetting to make the lock change to LX on the front bed; the gauge is significantly and obviously different

Moving on to a birds’eye backing, the bottom starts the pattern with dark color, top with light (another operator error and a reminder to keep notes even for what may seem obvious); the black is slightly thinner than blue resulting in a change in gauge once again

The bouncing gauges certainly indicate some of the problems in maintaining aspect ratios in representational knits. The best solution may be to do a large swatch in the planned technique that is at least 100 sts X 100 rs in chosen yarn and then adjusting image aspect ratio before knitting the final piece, which in turn may be better done before conversion to final BMP and require repeating the process from its beginning.

For separations such as technique 179, and those by default in Japanese machines for 2 color DB, images must have an even number of rows in length. My original image crop was 73W by 85L pixels, so I had to shorten it by one row, which was actually achievable within WinCrea. The single bed FI swatch measured 7 inches in width, the double bed ones 12 inches at their widest point.

Last but not least, here is my friend Rocco processed via Hyperdither, Mac to PC, to WinCrea, to Passap and knit 150X150 pixels/ stitches

May 24, 2019 a greyscale mode scaled image processed in ditherlicious online produced a sharper, far more defined image than my previous effort 142X146 pixels

for more Rocco “portraits” see post

GIMP and dithering color reductions for B/W “portraits”

The many faces of Rocco: in my 2013 tests in Gimp, the image is 150 pixels wide by 154 pixels high  The image is used with the kind permission of Rocco’s owner. I have used this image before, when I posted previously on some ways to reduce colored images to B/W for possible knitting using a Mac computer, please see post on 013/03/14/ color-reduction- conversions-mac-os/. Gimp offers some alternatives to the familiar dithers and is available, free, for both PC and Mac platforms. Tutorial links on Gimp edge detection available online as of May 2019 are listed at bottom of the post.

Image_Mode_Indexed_ one bit black: immediate result, too dark

Threshold adjustments may not be made in indexed images to alter the above image, so it’s back to greyscale. Reductions to greyscale may be achieved through Image_ Mode_ Greyscale or choosing Colors_Desaturate_OK options. Desaturation offers additional choices

Image_Mode_GreyscaleColors_Desaturate_OKRocco desaturated, in “knittable portrait size”using edge detection and its algorithmsDifference of Gaussians

what happens if in addition color_ invert is used with Robertsadjusting B/W with Thresholdafter a bit of “tweaking” Image_Mode_Indexed, rendering it “knittable in 2 colors” getting silly with filling the ground with pattern behind the floating head

2021: the latest, December 2020 updated version of Gimp for Mac OS
Gimp dithering controls easily accessible with mode changes to indexed I found I got the best results adjusting the contrast in the original greyscale image prior to changing its mode to indexed and dithering (Floyd_Steinberg, normal)  Dithering options in Gimp 2.10 may be found at the bottom of the colors menu This filter can reduce the number of colors in an image by reducing the levels per channel (colors and alpha). Different dithering methods can be specified to counteract quantization-induced banding.
Presets are common features for many Colors commands.
Red levels, Green levels, Blue levels, and Alpha levels sliders set the number of levels for the respective red, green blue, and alpha channels.
Dithering method: can specify the dithering method to use
None: no dithering will be performed
Floyd Steinberg: the most commonly used method of dithering, and the default for this filter
Bayer: the algorithm is characterized by noticeable cross-hatch patterns in the result
Random, random covariant: use randomization of the pixel values to reduce the number of colors
Arithmetic variants are based on magic numbers and arithmetic
Blue noise variants are sometimes thought to be the least distracting
Random and new seeds are two random dithering methods.
When converting to indexed colors with the image unaltered, and using positioned dithering, the last option Hyperdither: options offered  default Jarvis
default Stucki
online, options https://ditherit.com it is possible to choose from multiple palettes Sierra dither

5/4/2019 Other than GIMP: after straightforward load, convert, and save, with no other adjustments, images shown in approximately 150 pixels/sts in width, no significant change results with conversion to color B/W indexed
http://gazs.github.io/canvas-atkinson-dither/
online, default settings https://29a.ch/2016/08/04/ditherlicious-1-bit-image-dithering
Check dithered results, downloaded images may be in RGB Mode. Prior to any knitting, they will need to be converted to B/W indexed.
Looking for ways to reduce the noise in dithered images I tried this conversion in XnSketch, using the photocopy effect,  beginning with the colored image of Rocco, the results: imported the result into Gimp and saved it in indexed  2 color BW and in turn, 3 color indexed mode, no color adjustments, finding the result pleasantly simple beginning with the greyscale generated image followed by Mode changes in Gimp, indexed 2 color BW, then indexed 3 color, there appear to be very subtle differences with a bit more detail: Another online resource with an extensive array of dithering options https://app.dithermark.com. Here are 2 conversions using the app, the images are 2 color B/W. The presence of a third color is an illusion created by the difference in the distribution of BW color pixels, they loaded fine as viewed for knitting in Ayab, and in img2track, once I remembered to change its setting to 2 color knitting from the last used one at 4 colors It is possible to reduce images to 4 or 3 colors using the program as well: a slider for color count is used to choose the final number of colors in the reduction. Again, these instances have no added manipulation A series of dithers:
To retain the quality and size of the dithered image, download it, rather than using a screen grab. The software used to separate the chosen dither may alter the result somewhat. I am writing my posts using an iMac M1 with OS 12.0.1. At this point Ayab is not operable, img2track does open images, but in this case, with interesting distortions, and it does not download any files at all. Yet another dithering tool, allows one to draw in dithering mode using a variety of patterns and will dither images. In the latter instance, there is no real opportunity to tweak or alter the result shapes drawn using a few of the large variety of offered patterns: 

2023 working with pattern fills and removing any background 

In this instance, a portrait of a dog wearing a sweater image was generated in Midjourney and scaled to 191X195 pixels.
Dithering online apps were used to reduce the colors in instants to 4, 3, and 2.
The greyscale image was also color reduced and dithered in Gimp.
All results were not adjusted further in any way.
Color reductions could be tweaked a bit further prior to actual knitting.
Magnifying the chosen individual result will help visualize the change in resolution quality of the image in the final knit piece.

 

More GIMP charting 3

These are quick notes from some of my continuing experiments, not explicit how-tos or item patterns. Possible lengthening of designs dependent upon knitting technique is not considered; the “charts” were created keeping the aspect ratio of the original motif. The initial images are copyright free.

from scanned B/W source, 200 pixels X 227

open document

Image_Mode_B&W 1 bit indexed_ Convert

Image Scale 200 wide down to 50

areas were “cleaned up” using single-pixel pencil, when satisfactory capture window with grid enlarged for working graph,  or remove the grid, export in format for download

this is a partial repeat of a large black and white .png image

working with a smaller, random selection

Open image

Image_Mode_B&W 1 bit indexed_ Convert

enlarge, show grid, decide on the accuracy of repeat,  when OK, graph or export and knit, no clean up required for this one

Filter_Map_Tile_magnifying result  will test the accuracy of the repeat

the motif was a random crop, with obvious issues, more work would need to be done with the original image to isolate the proper section for tiling accuracy to occur

a multicolor image 143 pixels X 112

Image_Mode_Indexed _3 color (manual change from 4 to 3)

Image scale to 100 pixels wide

Enlarge for viewing grid and/or cleaning up; result yields 2 repeats that could be used 50 sts wide each, leaves could use a bit more detail

a partial image grab, pre any “corrections”

if color separations are needed for software that can superimpose colors and do the necessary color changer manipulations cues a link on color separations for screen printing provides some ideas. Another method

Tools_Selection Tools_By Color Select

Edit_Copy

Create new document the same dimensions

Edit_Paste

repeat for each color

the results: the flower is actually in the “wrong place” even with what appeared to be the same document settings

easier and “on the spot”:

Tools_Selection Tools_By Color Select

Click on color one (flower)

Edit_Cut

Fuzzy select, click on the screen outside of the image: the result

Re-open original image

Tools_Selection Tools_By Color Select

Click on color two (leaves)

Edit _ Cut

Fuzzy select, click on the screen outside of the image: the result

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