I’ve noticed that opening a GIF or PNG file in Pillow and then saving it unchanged can increase the file size, even when optimize=True is specified.
For example, the GIF at https://i.giantitp.com//comics/oots/oots0001.gif has size 109220 bytes, but when saved via Image.open("oots001.gif").save("oots001_copy.gif", optimize=True) the size increases to 121630 bytes.
Similarly, the PNG at https://i.giantitp.com//comics/oots/oots1000.png has size 1589401, but when saved via Image.open("oots1000.png").save("oots1000_copy.png", optimize=True) the size increases to 2136596 bytes (and without optimization it’s 2172818 bytes).
Is there any way to compress these files optimally using Pillow?
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