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Again, these instances have no added manipulation A series of dithers: 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. Here are 2 conversions using the app, the images are 2 color B/W. 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. Prior to any knitting, they will need to be converted to B/W indexed. Other than GIMP: after straightforward load, convert, save, with no other adjustments, images shown in approximate 150 pixels/sts in width, no significant change results with conversion to color B/W indexedĬheck dithered results, downloaded images may be in RGB Mode. Online, options it is possible to choose from multiple palettes Sierra dither 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 or when converting to indexed colors, here to black and white, the image unaltered, using positioned dithering, the last option Hyperdither: options offered default Jarvis

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What happens if in addition color_ invert is used with Roberts adjusting B/W with Threshold after a bit of “tweaking” Image_Mode_Indexed, rendering it “knittable in 2 colors” getting silly with filling the ground with pattern behind the floating headĢ021: the latest, December 2020 updated version of Gimp for Mac OS Image_Mode_Greyscale Colors_Desaturate_OK Rocco desaturated, in “knittable portrait size” using edge detection and its algorithms Difference of Gaussians Reductions to greyscale may be achieved through Image_ Mode_ Greyscale or choosing Colors_Desaturate_OK options. Threshold adjustments may not be made in indexed images to alter the above image, so it’s back to greyscale. Image_Mode_Indexed_ one bit black: immediate result, too dark Tutorial links on Gimp edge detection available online as of May 2019 are listed at bottom of the post.

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Gimp offers some alternatives to the familiar dithers and is available, free, for both PC and Mac platforms.

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/. 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.

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