Graphics Programs Reference
In-Depth Information
Figure 3-42. Before and after comparison
Tonal Corrections Using Layer Blend Modes
Layers have 21 different blend modes in GIMP. Blend modes control how layers interact with one another.
They can produce a wide array of different effects. It's worth spending time experimenting with them. You
can come up with some interesting results. For the purposes of this chapter, we'll only be concerned with
two layer blend modes that are useful for correcting exposure—Multiply and Screen .
Multiply : Multiplies the value of each pixel of the top layer with the corresponding
pixel for the layer underneath, resulting in a darker image
Screen : The opposite of Multiply, resulting in a brighter image
Layer blend modes are very useful for correcting overexposed and underexposed images. They often
require duplication, adjusting opacity, and more than one blend mode. Using layer blend modes requires
some experimentation, but they can work very well.
 
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