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免费图片，搜索黑白照
https://www.pexels.com/search/black%20and%20white/
照片在浏览器里放大，右键复制，PS里面新建，粘贴，用自己阅读器的分辨率作为裁剪比例裁一下，然后将图片缩小到阅读器实际分辨率，存成png，jpg的话会有有损压缩水纹.
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