but you seem to imply that with a 'white plate' correction file and Photoshop
layers one could bypass the raw converter.
How would one do this?
Shoot a white plexi plate (see: "lens cast calibration") with the same aperture and focussing as the actual image.
- Process capture as a TIF
- Process LCC shot with the same settings (white balance, icc profile) as a TIF.
To correct color shift:
- Open the capture in Photoshop
- Add a second layer, mode overlay, select "fill with 50% grey", set layer back to mode "normal"
- Add the LCC shot on a third layer, set layer to mode "color"
- Merge 2nd and 3rd layer on a fourth layer, invert, set to overlay
- Delete (or turn off) layer 2+3