Advanced B/W Conversion No. 2
The Fourth Channel Mixer Layer: Expanding the Dynamic Range of a Continuous-Tone Black-and-White RGB File
At this point you should be fairly clear on the concept that red, green, and blue, the primary colors of light, all have relationships with each other. It’s that interrelationship in the visible spectrum that our eye perceives as “color.” What is unique about black-and-white film is its ability to record the spectral relationships among the primaries of light; it can also record the changes in those spectral relationships and do so in a grayscale.
When you convert RGB to a “gray scale” the way you did in the previous two exercises, you basically created a “digital positive negative.” Negative in the sense that, ...
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