Purple cast in daylight

[g-man]

@miaohaha

This is a Sony a7r4 that is astro-modified and then has a Kase hot mirror filter clipped in for daytime photography. Lens is a Voigtlander 21/1.4.

If the camera was modified (remove the aa filter?), then your best bet is to create a color calibration profile for that camera.

https://darktable-org.github.io/dtdocs/en/module-reference/processing-modules/color-calibration/#extracting-settings-using-a-color-checker