Separation negatives for better tonlity

[PiezographySupport]

@xander

would there be a visible advantage on the final platinum or, say, kallitype / salt / cyano print?

The only advantage in GUM or other process may be using different sensitivity for shadows and highlights to increase tonal fidelity and decrease grain etc. Not needed with higher quality processes like Platinum IMO.

@xander

would it be better to use the curve adjustment and white/black point adjustments in PPE2, or would it still be best to linearize for each color separately and do PS curves for fine adjustments / tonal separations

linearization should always be done after all layers have been printed and then the measurement data should be applied to each individual curve that is used to make up the final print.

eg:

1. Print neg 1 with curve 1 which may have totally blown HLs on purpose.
2. Print neg 2 with curve 2 which may have totally light shadows and dark HLs on purpose.
3. Print the 2x layer target with the two negs.
4. Measure target and apply this measurement to each curve in the same way.

This should enable a linearization of a 2x (or 3x) multi-neg setup.

best,
Walker