In the early days of digital I used to dream about ways to make masks to apply to my ULF negatives for printing in carbon. But by the time I figured out how to do it I discovered that there was vastly more control possible by just adjusting the image file in PS and printing a digital negative.
But it might be interesting even today to make masks and print directly some of the old negatives. In what book or article does Alan Ross describe his advanced method of making digital masks?
Sandy
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