Knit QR codes 1, repeats from BW images

A video on this topic. I work using Mac OS 10.10 at the moment. When I first wrote on this topic, I downloaded a then free converter The app, Aztec Code Generator, is now no longer free (11/2015), but costs $ 1.99 to purchase. There is a still free, online QR generator

my beginning code

the original image size was reduced to 60 pixels square, and in turn to 40 pixels square respectively, then magnified to 600 times for superimposing the single stitch grid as described in video; screen captured image saves are needed for saving gridded images

the 60 stitch repeat

the 40 stitch repeat

using the aztec code generator to control output size

Screen Shot 2015-11-13 at 9.30.23 AM

saved

Untitled

X1,000, cropped and gridded

screenshot_43

not all units are created equal: areas numbered indicate where some of the horizontal  units are 5 wide rather than as most 4, and closer inspection will reveal the same for some vertical units. Reconfiguring the grid ie to 4X4 pixels would be an alternative way to “resize” the image, but fails because of the disparities when the unit is applied overallscreenshot_43

trying the same process on this BW jpeg, the resulting repeats require further clean up and editing along edges of shapes

using GIMP: 40 stitch repeat, no additional scaling, converted to 1bit BW, could use a bit of clean up, I prefer to work with a black grid

40s scroll

24 stitch24s scroll

as an afterthought: results using img2track to pixelate same image before gridding

please note these scroll graphs are not accurate working repeats to be knit as they are

it is always a good idea to test tiling for any “surprises” before any actual knittingscreenshot_41

11/2015_Knitting’ low resolution is reflected in the number of stitches and rows per inch or per repeat. In this instance Gimp was again used to scale and process the image

Today’s generated image: happy holidays QR code, Aztec code generator, 300 pixels square including white border

happy holidayscolor mode converted to 1 bit B&W; 100 stitch repeat

&H100

scaling, gridding for 30 stitch repeat

HH30st

for 24 stitch repeat: note loss of detail as stitch and row count is reduced

h&h24

and happy holidays via the free, online generatorstatic_qr_code_without_logousing the generator options to control available output size

QR generator

The above begs many questions. Upon investigation it appears there are 18 2D bar code variants, some static, some dynamic. Qrme is a UK site that provides information on trackable QR codes, forums and more. Their page shows scaled in size codes modules.