The many faces of Rocco
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.
Image_Mode_Indexed_ one bit black: immediate result, too dark
Threshold adjustments may not be made in indexed images to alter above image, so it’s back to grey scale. Reductions to grey scale may be achieve through Image_ Mode_ Greyscale or choosing Colors_Desaturate_OK options. Desaturation offers additional choices
rocco desaturated, in “knittable portrait size”
using edge detection and its algorithms
Difference of Gaussians
what happens if in addition color_ invert is used with Roberts
adjusting B/W with Treshold
after a bit of “tweaking”
getting silly with filling ground with pattern behind floating head
Free Pixel art patterns for both Photoshop and Gimp may be found at texturemate. To get them to work in GIMP if they are multiple sets, I would suggest combining them all into a single folder which may then be added to preferences, renaming or numbering patterns if the series #s repeat. The tutorial may be found here. The same patterns may be added to PS, a method for doing so may be found here.
As for camera portrait apps: SnapDot ($1.99) will render dotted “artworks”