// 倒序遍历2*len-1次：模拟数组循环（核心！易错点1）
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While this is immediately effective, the random perturbations introduce a disturbing texture that can obfuscate details in the original image. To counter this, we can make some smart choices on where and by how much to perturb our input image in an attempt to add some structure to our dither and preserve some of the lost detail.
Creating visual content on the go