Are there currently supported cameras in need of white frames?

henrym11106 · January 4, 2026, 10:40am

is there a list of cameras that could benefit from test photos? I have a Canon EOS-1D II and a EOS-1D IV and I don’t know if RawTherapee already has e.g. white frame sets.

I ask because in some photos I find magenta highlights and edges that are tricky to work around, and I read that white frames might be useful. not an especially pervasive issue but it happens.

also some low ISO settings get a distinct red color cast when exposure is pushed, but ISO 200+ on the 1D II is fine, as is ISO 400+ on the 1D IV.

the closest thing I could find to a list is here and both bodies are absent.

Lawrence37 · January 5, 2026, 12:57am

Here:

github.com/RawTherapee/RawTherapee

rtengine/camconst.json

dev

/*
vim: set syntax=javascript:

DO NOT EDIT THIS FILE!

All changes made here will be lost on software update. If you want to add custom values or change existing ones, create
a "camconst.json" file next to your personal "options" file. Its values will then override and/or complete the ones of
this file.

If you add values for your own camera, consider sharing them with the community for everyone's benefit. You can do so
via our forum or GitHub page:
- https://discuss.pixls.us/c/software/rawtherapee
- https://github.com/RawTherapee/RawTherapee/issues

Value priority:
1. If you set the dcraw matrix in your user camconst.json file for a camera entry which already exists in RT's file
    (same camera, same model), your values will replace RT's ones.
2. If you set the black level values in your user camconst.json file for a camera entry which already exists in RT's
    file, your values will replace RT's ones, even if RT's ones are more complete and/or detailed. You might want to
    copy/paste RT's levels first (if provided) to your user's file and complete/modify them.

This file has been truncated. show original

Find the camera model and see if there is a white section under it. If it does, white frames are NOT needed. You could also try searching the issues to see if white frames have already been supplied.

henrym11106 · January 5, 2026, 6:44am

Thanks. looks like there’s no mention of either camera there.

searching issues I only found incidental mention of the 1D IV and nothing for the mark II, so I suppose white frames have not been submitted.

and regarding the ISO-induced color/tone shift it’s not too much of a problem on the 1D4, it’s mostly just that 1/3 stop increments cause screwy image quality changes below ISO400. I only use whole stops anyway.

with the 1D2 however, the gamma response seems to change below ISO 200, as shadows become noticeably harsher and more green-tinted. can anything be done about this or is it just an inherent quirk with the camera?

anyway I can shoot a few sets of white frames as per the wiki and open an issue on github when I get the chance, probably in the next few days. is it just the white frames that are needed?