管理员能够指定各种压缩级别。
压缩选项压缩-压缩数据使用默认压缩级别。
Compression Options. Compress None - Do not compress data (although header information will be added).
当应用到压缩级别较高的图像时，如果润饰的区域足够大，依然会获得准确的结果。
When it is applied to the images that have higher compression levels, accurate results are also obtained if the region that has been retouched is sufficiently large.
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