White Balance for film slides (negative color film) not working

[NotMyFault]

Hi,

 

I'm in the process to scan hundreds of analog film slides, color negatives from 1950 to 1980, who start to self-destruct. 

In my process I use RAW persona, Tones panel, and presets for inverted curve (with different curves for RGB channels). 

This works really fast and allows to inspect the inverted image directly in RAW.

Currently the presets are not applied by default (this worked long time ago and seems broken in V2)

Main issue: the white balance tool does not work correctly probably due to inversion. If you pick any almost white area, you get erratic jumps to green / magenta / orange, as the RAW is actually almost black before inversion.

I expect this will not be rated as bug, then please move this to feedback section.

We need full support for film slide scanning:

• invert B/W images (thus scanned full RGB for fine-tuned defects correction)
• invert color images using a range of RGB curve presets depending on film type.
• Allow self-defined presets.
• Provide option to create curve from image of "black" capture which are often available at the start / end of a 24/36 photo slide.
• Allow white balance adjustment on inverted color films: the white balance need to start AFTER the inversion is done, but still in RAW/Develop Persona.