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Consider using Zstandard and/or LZ4 instead of Deflate
One of the issues we have with .PNG is slow read/write times. There are now new lossless open source codecs without patent concerns, such as Zstandard (maintained by Facebook) or LZ4: https://faceb...
There are now new lossless open source codecs without patent concerns, such as Zstandard (maintained by Facebook) or LZ4: Zstandard is used by the new Khronos KTX2 GPU texture format specification. There are also other far simpler but even faster codecs being developed, such as .QOI's, but using this would likely require changing or not filtering the image before compression: https://news.ycombinator.com/item?id=29328750
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