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Instead of perturbing each pixel in the input image at random, we can choose to dither by a predetermined amount depending on the pixel’s position in the image. This can be achieved using a threshold map; a small, fixed-size matrix where each entry tells us the amount by which to perturb the input value , producing the dithered value . This matrix is tiled across the input image and sampled for every pixel during the dithering process. The following describes a dithering function for a 4×4 matrix given the pixel raster coordinates :
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"INSERT OR REPLACE INTO items (url, title, author, published, tags, content, raw) "
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完美日记是如何一步步“哑火”的“当年猫狗盘席卷彩妆圈的时候，市场上还没有那么多五花八门的产品，化妆小白基本人手一盘完美日记的眼影，结果现在都成了时代的眼泪了。”苏苏打开化妆柜，早在2022年就过期的猫咪盘、小狗盘、熊猫盘、小猪盘还保持着99新的模样，但苏苏却再也提不起兴趣来使用了。