I didnāt know about this problem, thanks for the explanation. Iām afraid that color shift is quite āspottyā and not constant across the frame, so it would be very hard to solve by software means.
Just a wild idea: since weāre talking about B&W negatives i suppose, what about shining an orange/yellow light through it, instead of white? If the problem is more evident in the blue channel, removing it from the source backlight could mitigate that.
Hi jdc, thanks for your explanation. I know nothing about color spaces, so iām talking as a complete ignorant here, but that is the exact use case that makes me dubious about auto-wb methods. I have some concert pictures that were shot with an awful red or purple LED light. The pictures have a strong tint all across the frame. How can an autowb method restore the original tint? I would rather take the color balance from another āreferenceā frame from the same film, and apply that to the other frames. (iām working on it at the moment and iāll post some examples later).
Anyway iāll try the hue variance method as soon as i can get my hands on the gmic filter