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newC.r) / 16),\n g: Math.floor((pixels[i].r - newC.g) / 16),\n b: Math.floor((pixels[i].r - newC.b) / 16),\n };\n\n // Match our quantized palette\n pixels[i] = newC;\n\n // Spread error to neighbouring pixels\n if (i < pixels.length - 1) {\n // Spread error to next pixel\n pixels[i + 1].r += err.r * 4;\n pixels[i + 1].g += err.g * 4;\n pixels[i + 1].b += err.b * 4;\n if (i < pixels.length - 2) {\n // Spread error to next pixel\n pixels[i + 2].r += err.r * 3;\n pixels[i + 2].g += err.g * 3;\n pixels[i + 2].b += err.b * 3;\n // Spread error to lower pixels\n if (i < pixels.length - width - 2) {\n pixels[i + width - 2].r += err.r;\n pixels[i + width - 1].r += err.r * 2;\n pixels[i + width].r += err.r * 3;\n pixels[i + width + 1].r += err.r * 2;\n pixels[i + width + 2].r += err.r;\n\n pixels[i + width - 2].g += err.g;\n pixels[i + width - 1].g += err.g * 2;\n pixels[i + width].g += err.g * 3;\n pixels[i + width + 1].g += err.g * 2;\n pixels[i + width + 2].g += err.g;\n\n pixels[i + width - 2].b += err.b;\n pixels[i + width - 1].b += err.b * 2;\n pixels[i + width].b += err.b * 3;\n pixels[i + width + 1].b += err.b * 2;\n pixels[i + width + 2].b += err.b;\n }\n }\n }\n i += 1;\n }\n return pixels;\n}\n\n/**\n * Dither the image into a smaller palette\n * Uses Sierra lite matrix\n * Use twoRowSierraDither for more accuracy\n */\nexport function sierraLite(\n pixels: Color[],\n width: number,\n palette: Color[],\n): Color[] {\n let i = pixels.length - 1;\n // pixels is an array of pixels with r, g, b values\n // width is the width of the image in pixels\n while (i >= 0) {\n const newC = findClosestColor(pixels[i], palette);\n const err = {\n r: Math.floor((pixels[i].r - newC.r) >> 2),\n g: Math.floor((pixels[i].r - newC.g) >> 2),\n b: Math.floor((pixels[i].r - newC.b) >> 2),\n };\n\n // Match our quantized palette\n pixels[i] = newC;\n\n // Spread error to neighbouring pixels\n if (i > 0) {\n // Spread error to next pixel\n if (i % width !== 0) {\n pixels[i - 1].r += err.r << 1;\n pixels[i - 1].g += err.g << 1;\n pixels[i - 1].b += err.b << 1;\n }\n // Spread error to lower pixels\n if (i > width + 1) {\n pixels[i - width + 1].r += err.r;\n pixels[i - width].r += err.r;\n pixels[i - width + 1].g += err.g;\n pixels[i - width].g += err.g;\n pixels[i - width + 1].b += err.b;\n pixels[i - width].b += err.b;\n }\n }\n i -= 1;\n }\n return pixels;\n}\n","deleted","subdomain",[163,164,146],"src","dither","permalink","https://www.val.town/x/maxm/monke/code/src/dither/sierra.ts","extension","routes/embed","actionData","errors"]