After you're changing WB by Alt-Click (or by preset or WB edit), XMP sidecar file should be created in folder containing your image. If not, please make sure you do not have XMP disabled in Preferences-XMP and you do not set 'Read Only XMP' setting on.
FRV's WB settings are stored in <libraw:WBCoeffs> section of XMP file.
When re-opening the file, WB settings are parsed and compared to standard presets. If custom WB is very close to one of presets, the preset is selected instead of 'Custom' display.
After you're changing WB by
After you're changing WB by Alt-Click (or by preset or WB edit), XMP sidecar file should be created in folder containing your image. If not, please make sure you do not have XMP disabled in Preferences-XMP and you do not set 'Read Only XMP' setting on.
FRV's WB settings are stored in <libraw:WBCoeffs> section of XMP file.
When re-opening the file, WB settings are parsed and compared to standard presets. If custom WB is very close to one of presets, the preset is selected instead of 'Custom' display.
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Alex Tutubalin/FastRawViewer team