Layer Color-Stretching Commands
GIMP has several automatic commands for stretching
the columns of the histogram for the color channels of the active
layer. By pushing bright pixels to the right and dark pixels to the
left, they make bright pixels brighter and dark pixels darker, which
enhances the contrast in the layer.
Some of the commands stretch the three color channels equally, so that the
hues are not changed. Other commands stretch each of the color channels
separately, which changes the hues.
The way the stretching is done varies with the different commands and the
results look different. It is not easy to predict exactly what each
command will do. If you know exactly what you are doing, you can get the
same results, and even more, with the
Here are examples of the results of these commands, all together on one
page, so you can compare them more easily. The most appropriate command
depends upon your image, so you should try each of them to see which
command works best on it.
The original layer and its histograms
The “Equalize” command
The “White Balance” command
The “Stretch Contrast” command
The “Stretch HSV” command
The “Color Enhance” command
The “Normalize” command