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3.
Doing the math
All you have to do is to click Image/Calculations. It is rarely mentioned in image editor manuals, despite of being a very useful and versatile feature, just like its companion, Apply Image, introduced a few articles earlier. Calculations may offer even more possibilities, among others, black-and-white conversion.
Leave everything in the Source 1 section on default. The first two options are without alternatives anyway, and Channel should be left set to Gray.
You’ll only have to care about Channel under Source 2 as well. Set it to Red so that the program will do the calculations by comparing the red and the "grey" channels. You’ll also need the Blending field. In our case, Soft Light led to an appropriate contrast without an obtrusive nature. Feel free to experiment with other blending types to see how well they perform. To refine the general effect, set Opacity to 10%.
Finally, choose New Document from the Result dropdown. This way, the result will constitute a new document. |