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Traneptora / jxlatte

Java JPEG XL decoder
MIT License
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Are the default weights etc necessary for simple lossless decoding? #34

Closed peterdk closed 1 month ago

peterdk commented 2 months ago

I am researching a bit how to get JPEGXL decode of losless JXL images in my Android app. I am wondering about the size of the JAR file of this library. Are these weight files required for this functionality? They seem to take up a lot of space, undoing my gains with conversion of PNG to JPEGXL lossless.

Traneptora commented 2 months ago

They are necessary for VarDCT, but not for lossless images. They're in a file to avoid needing to compute them on the fly, which is a temporary measure before I optimize computing them.

Traneptora commented 2 months ago

I will say I hadn't considered the file size issue, so I will look into this.

Do note that I still have many optimizations to do, particularly in the lossless area.

peterdk commented 2 months ago

Yeah, no worries. I am developing for Android, and have some visual assets in PNG. I saw I could save around 1MB of storage, with converted to jxl lossless. But if the code to decode them, is larger then that, it has not much use ofcourse. But I'll experiment a bit with this library and see what I can drop/cherrypick.

Traneptora commented 1 month ago

Fixed with recent commits.