Because case sensitivity and the fact that the compression scheme used is lossless, is different from and is compressed as two different tags.
由于大小写敏感性，并且使用的是无损压缩，与不同，它们被压缩为两个不同的标记。
Like a GIF, a PNG file is compressed in lossless fashion (meaning all image information is restored when the file is decompressed during viewing).
像一个GIF, PNG文件压缩在无损的方式(即所有图像信息时恢复文件解压在观看)。
So, the compressed picture than before reduced about 10 times, and the compressed image quality basic no change, lossless compression.
左右，压缩后的图片比之前缩小了10倍左右，而且压缩后的图片质量基本没什么变化，实现无损压缩。
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