whitebalance is a Gimp script for changing the white balance of
images. This script-fu script can be used to convert the foreground
color to either a neutral gray, or to the color of the background. The
conversions are performed in the sRGB color space.
In Gimp 2.4, more colorspaces are supported, but the plugin has not
yet been adapted to work with general colorspaces.
The script installs itself under Filters/Colors/White Balance.
Download
Usage
The script can be used in two ways:
- Make foreground gray. In this
mode, the colors are scaled so that the foreground color assumes a
gray tone. Note that an actual gray tone may not be achieved, if
clipping occurs in some color channel.
- Convert foreground to background.
In this mode, the colors are scaled so that the
foreground color is converted to background color. Again, a perfect
match may not be achieved, if clipping occurs in some color
channel.
The
Conversion amount slider can be used to determine the
amount of converstion, from 0% (no change) to 100% (full conversion).
This can be used to leave some of the original color cast in the
image, which sometimes yields more natural results.
The Intensity slider is used to modify the intensity of the
image; this can be useful to avoid clipping of color channels. The
slider specifies the intensity of the new image as a percentage of the
intensity of the old one.
The Saturation slider can be used to modify the saturation of
the image. Sometimes, when performing a large change in white
balance, the effect is more natural if the image is desaturated a
little bit.
The conversion is done in the official sRGB color
space, taking into account of the definition of gamma for sRGB.
If your intent is to correct the red or blue cast of photos taken in
different lighting conditions, you may want to consider using the
colortemp script-fu.
