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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 :，这一点在爱思助手下载最新版本中也有详细论述
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Фото: Maxim Shemetov / Reuters。业内人士推荐Line官方版本下载作为进阶阅读
第一百七十条 被拖方未按照约定支付拖航费和其他合理费用的，承拖方对被拖物享有留置权。