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There are other dithering methods: Jarvis dithering, Stucki dithering, Burkes dithering, Sierra dithering, but they differ mostly in error diffusion scheme. Once verified, you will get the Select Photo button. Newpixel := find_closest_palette_color(oldpixel) To colorize photos, open the website and click on Try it yourself button. The pseudo-code of the algorithm from wikipedia: for each y from top to bottom do In the Floyd-Steinberg algorithm, the error between adjacent pixels is distributed as follows:Īs you can see, this distribution allows you to process the image in one pass - from left to right, top to bottom. 1 The idea of the algorithm is to calculate quantization error (rounding error) and "return" part of it to the original image, distributing it between neighboring pixels that have yet to be processed. To overcome this problem, in 1976, Floyd and Steinberg proposed a dithering algorithm based on diffusion of the image quantization error. Using only the threshold value results in too sharp transitions between black and white, especially at smooth edges. If lower or equal, replace the original pixel color with black.īy default, the calculator uses the value of 127 as a threshold, the middle of the range.
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