Is there JXL lossless JPEG transcoding? about imagetoolbox HOT 7 CLOSED

you should better write it to the jxl-coder, because it doesn't have this feature yet

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Use jxl tools option, transcoding requires usage of raw files

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This is now a feature in jxl-coder. (losslessly) Transcoding jpeg into jxl is almost always better, but there should be an option to not transcode too (transcoding should be on by default as is with libjxl)

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Thanks

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I will add separate jxl tools for it, because it uses some different mechanism

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Check latest alpha, it's available now

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Where is it? Im on alpha 3 and using jxl lossless doesnt seem to transcode. Jpegli also doesnt do that (and its not what would do it anyway, but i really like that its there now)

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