Gimp - 2.4 Guía Del Usuario
GNU Image Manipulation Program
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14.10.21
The ‘Auto’ Submenu
Figure 14.90: The ‘Colors/Auto’ submenu
The Auto submenu contains operations which automatically adjust the distribution of colors in the active layer, without requiring
any input from the user. Several of these operations are actually implemented as plugins.
any input from the user. Several of these operations are actually implemented as plugins.
14.10.21.1
Activating the submenu
• You can access this submenu from the image window through Layer → Colors → Auto.
14.10.21.2
Contents of the ‘Auto’ Submenu
The Auto submenu contains the following entries:
• Section
• Section
• Section
• Section
• Section
• Section
14.10.22
Equalize
The Equalize command automatically adjusts the brightness of colors across the active layer so that the histogram for the Value
channel is as nearly flat as possible, that is, so that each possible brightness value appears at about the same number of pixels
as every other value. You can see this in the histograms in the example below, in that pixel colors which occur frequently in the
image are stretched further apart than pixel colors which occur only rarely. The results of this command can vary quite a bit.
Sometimes ‘Equalize’ works very well to enhance the contrast in an image, bringing out details which were hard to see before.
Other times, the results look very bad. It is a very powerful operation and it is worth trying to see if it will improve your image.
It works on layers from RGB and Grayscale images. If the image is Indexed, the menu entry is insensitive and grayed out.
channel is as nearly flat as possible, that is, so that each possible brightness value appears at about the same number of pixels
as every other value. You can see this in the histograms in the example below, in that pixel colors which occur frequently in the
image are stretched further apart than pixel colors which occur only rarely. The results of this command can vary quite a bit.
Sometimes ‘Equalize’ works very well to enhance the contrast in an image, bringing out details which were hard to see before.
Other times, the results look very bad. It is a very powerful operation and it is worth trying to see if it will improve your image.
It works on layers from RGB and Grayscale images. If the image is Indexed, the menu entry is insensitive and grayed out.
14.10.22.1
Activating the Command
• You can access this command from the image menubar through Layers → Color → Auto → Equalize.
• or by using the keyboard shortcut Shift-Page_Down.