5.4. Brightness-Contrast tool
|Revision $Revision: 1.30 $
The Brightness-Contrast tool adjusts the brightness and contrast
levels for the active layer or selection. This tool is easy to
use, but relatively unsophisticated. The Levels and Curve tools
allow you to make the same types of adjustments, but also give you
the ability to treat bright colors differently from darker colors.
Generally speaking, the BC tool is great for doing a "quick and
dirty" adjustment in a few seconds, but if the image is important
and you want it to look as good as possible, you will use one of
the other tools.
In GIMP 2.4, a new way of operating this tool has been added: by
clicking the mouse inside the image, and dragging while keeping
the left mouse button down. Moving the mouse vertically changes
the brightness; moving horizontally changes the contrast. When
you are satisfied with the result, you can either press the "OK"
button on the dialog, or hit the Return key on your keyboard.
The Brightness-Contrast Tool can be called from an image menu:
-> -> . If you find yourself using this tool often, you
can add it to the Toolbox using the
This slider sets a negative (to darken) or positive (to
brighten) value for the brightness, decreasing or
increasing bright tones.
This slider sets a negative (to decrease) or positive (to
increase) value for the contrast.
The Preview checkbox makes all changes to the brightness
and contrast dynamically so that the new level settings
can be viewed immediately.