Thank you for your response, all so many days ago; I must apologise for the delay.
I just tried several things, again. The problem I am having with the color shift when processing the CR3 files only happens, and always happens with files from my EOS R7.
As for jpeg files, white balance is set to “camera.” I have deleted all other versions of the dev / or predev appimage files, and all directories “RawT*” in ~/.config.
ART does not suffer from this problem.
As for Color Temperature, I think I was out in left field on that, because it is my capture methodology to use color temperature in camera. Could that be what leads me astray here? The preview image (I use Entangle under GNU/Linux for image captures under GNU/Linux).
Since I am photographing microscope slides of histological sections through a microscope, I can recover from this irksome problem by using the dropper tool, and clicking on a transparent part of the image, which should be rendered white in my estimation.
It has been problematic, even impossible, to process images of anything else.
Another problem with the binary RawTherapee, the newest under Manjaro GNU/LInux (ie., Arch-like GNU/Linux) has been a border of a strange hue, and bleached white images. I think efforts have been made to rectify the border problem.
ART, unfortunately, does not do a good job with Haze Reduction. DarkTable has been a black box, nonsensical controls, IMHO, but I am inclined to try again. If I can figure out how to save images in a sane manner.
BTW, I love the camera, but Canon has done it again, as it has with printers and cameras I have owned: protect itself from allowing the public to figure out how to use it’s drivers and firmware, to everyone’s detriment. What the heck do they think they have to lose? It’s a mob deal with the Big Two… I guess…
Thank you again.