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The Book of GIMP by Karine Delvare, Olivier Lecarme

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Exercise 7.1 The Image: Colors > Threshold tool is difficult to use well, and, unfortunately, it generates a black and white image. But you can choose a subrange that preserves the most significant part of the image. And you can often get interesting results by choosing a short subrange to produce something similar to an inverted etching.

Exercise 7.2 Screen mode is a good candidate when combined with an opacity reduced to 40% or less. Normal mode with a very reduced opacity can also be handy.

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