Originally posted by arun54321
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One could control for some of that by using a monochrome or 4:4:4 JPEG file and potentially even skipping the colorspace transform - either by outputting native YUV or encoding in RGB (i.e. if the image isn't monochrome).
However, that would tell one less about what we actually want to know, which is the nature and significance of the differences between the original JPEG file and the JPEG-XL version. For that, it would be instructive to stick to more "typical" YUV 4:2:0 files and either analyze the differences between the two decoded outputs or ideally to compute PSNR vs. a raw original.
The potential benefit from this investigation could be informing users interested in maximizing the fidelity of their image collection that their best option would in fact be a full transcode.
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