User Guide

GNU Image Manipulation Program
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Color
Figure 8.27: Example for layer mode ‘Color’
(a) Mask 1 is used as upper layer with 100% opac-
ity.
(b) Mask 2 is used as upper layer with 100% opac-
ity.
Color mode uses the hue and saturation of the upper layer and the value of the lower layer to form the resulting image.
Value
Figure 8.28: Example for layer mode ‘Value’
(a) Mask 1 is used as upper layer with 100% opac-
ity.
(b) Mask 2 is used as upper layer with 100% opac-
ity.
Value mode uses the value of the upper layer and the saturation and hue of the lower layer to form the resulting image. You
can use this mode to reveal details in dark and light areas of an image without changing the saturation.
Each layer in an image can have a different layer mode. (Of course, the layer mode of the bottom layer of an image has no
effect.) The effects of these layer modes are cumulative. The image shown below has three layers. The top layer consists of
Wilber surrounded by transparency and has a layer mode of ‘Difference’. The second layer is solid light blue and has a layer
mode of ‘Addition’. The bottom layer is filled with the ‘Red Cubes’ pattern.