Hmmm. I'm not sure that would work. Could you create a channel for - in the case of "negative white" - infinite density in magenta, yellow or cyan .. and infinite density overall? Conversely, in "positive white" there would be NO density in all... ?Originally Posted by Nick Zentena
I have channels set for - Color; Agfacolor 100 Exposed with Dynalites - developed with Tetenal C41, and printed on Ilfocolor developed in Tetenal RA-4 - using a gray card for reference; Agfacolor 400 - otherwise the same processing and printing as previous; another channel using "Fair Caucasian Skin", instead of a gray card; Another - "Gray card in Daylight" - and so on.
I'll do a test strip before each "session". Interesting to see the "chemistry batch - to batch" variations, the stability or lack of it, over time or in lot-to-lot variations of paper --
I've done a few "Painting with Light" images, where the model is illuminated solely by light from a transparency projected through a Hasselblad PCP80. The technical aspects of all this are complex: the lamp in the projector has a color temperature of something like 3600K - and I'm using Daylight (5500K) film - but all bets would be off anyway, considering the changes to the light, passing through the transparency. I've set a channel for "Fair Caucasian Skin" from a gray card held by the model, under those conditions, and analyze accordingly, using the ColorStar. The models' coloring looks natural, and the colors of the projected transparencies appear to be unaltered.
I'm sure this would be a exercize enough to drive me up a wall without the ColorStar.