This isn't exactly nondestructive editing because at some point you need to make a "New from Visible" layer. The same general procedure can be used to darken as well as lighten portions of an image, again controlling the effect using a layer mask. High bit depth GIMP is my primary image editor, and I've used the procedure described below for several years as my "go to" way to modify image tonality. The procedure is completely "hand-tunable" using masks and layers, and is as close as you can get to non-destructive image editing using high bit depth GIMP 2.9/2.10.
#Photoflow and gimp 2.8 how to
This step-by-step tutorial shows you how to use GIMP's unbounded floating point "Colors/Exposure" operation to recover shadow information - that is, add one or more stops of positive exposure compensation to an image's shadows and midtones - without blowing out or unduly compressing the image highlights. But really these algorithms are special-purpose tone-mapping algorithms, which sometimes work pretty well, and sometimes not so well, depending on the algorithm, the image, and your artistic intentions for the image. Precanned algorithms for accomplishing this task are often referred to as "shadow recovery" algorithms. High bit depth GIMP's floating point "Colors/Exposure": much better than Curves for lightening the shadows and midtones of an image without blowing the highlightsĪ very common editing problem is how to lighten the shadows and midtones of an image without blowing out the highlights, which problem is very often encountered when dealing with photographs of scenes lit by direct sunlight.
High bit depth GIMP's floating point "Colors/Exposure": much better than Curves for lightening the shadows and midtones of an image without blowing the highlights.
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