python PIL保存不同大小的图像原始 [英] python PIL save image different size original

问题描述

我正在使用python中的PIL进行项目. 只需打开并保存图像，即可使输出图像比原始图像大(以字节为单位)，并保持相同的分辨率，而我不知道为什么...

I´m working on a project with PIL in python. Simply by opening and saving an image makes the output image bigger (in Bytes) than the original, maintaining the same resolution, and i don´t know why...

from PIL import Image
img = Image.open("photo.png")
img.save("photo2.png", "PNG")

以上代码的结果

有人知道为什么会这样吗?我需要它们完全一样.

Does any one have any idea why this happens? i need them to be exactly the same.

推荐答案

PNG是一种压缩的无损格式.原始图像可能使用不同的压缩设置保存.

PNG is a compressed lossless format. The original image was probably saved with different compression settings.

查看文档您可以尝试:

img.save("photo2.png", "PNG", optimize=True)

或

img.save("photo2.png", "PNG", compress_level=9)

默认情况下，使用compress_level=6.

请注意，optimize选项包括，将压缩级别设置为9.但是，它还会尝试找到最佳的编码器设置.

Note that the optimize option includes setting the compression level to 9. But it also tries to find optimal encoder settings.

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