Jon Sneyers

This is undoing some of https://github.com/libjxl/libjxl/pull/3171 so pinging @szabadka in case I missed something.

> Just a piece of trivia: the 257 factor trick is also how Matlab does im2uint8() and im2uint16() conversion... [In Octave as well, only used between uint8/uint16](https://sourceforge.net/p/octave/image/ci/default/tree/inst/imcast.m#l103). To be clear:...

@jyrkialakuijala could you take a look? To me it looks like we're being too aggressive on the AC of the B component here, causing yellow details to get desaturated. Bumping...

This is related to https://github.com/libjxl/libjxl/pull/2704 Strictly speaking, the JPEG file is not conforming to the JPEG spec (since DHT needs to have "one or more" tables). The current `jbrd` spec...

Thanks for noticing this problem! Looks like this is caused by slight differences in the way the conversion from int to float is implemented in `dec_modular.cc` (which is what is...

+1 on adding support for the ISO 21496-1 binary format of gain map metadata, at least for decode (encode would be nice too). It would also be useful to have...

I tried again with this base image, which was encoded using ImageMagick `convert -quality 100` (i.e. libjpeg-turbo, 4:4:4, quantization tables all 1s).  The result is this:  Bumping up...

Thanks for the insights — I guess the bands are an artifact of the tone mapping I used to produce the SDR image then, and can probably be avoided by...

> I did some testing recently, and I think `-E 1` could be enabled at effort 9, with faster decoding level 2 defaulting it back to 0. It has a...

Rebased this. Now the performance impact is as follows: Before: ``` 31 images Encoding kPixels Bytes BPP E MP/s D MP/s Max norm SSIMULACRA2 PSNR pnorm BPP*pnorm QABPP Bugs ----------------------------------------------------------------------------------------------------------------------------------------...