Graphics Programs Reference
In-Depth Information
Correcting Color Casts
A color cast is a predominance of a certain color throughout the entire image. Color casts are usually
unwanted, but sometimes, a photographer might be attempting a certain artistic effect for which the color
cast is desirable. Most of the time, however, they are just representative of pictures that have gone wrong.
Color casts can be the result of a number of factors: the wrong film type used for the light source, incorrect
white balance setting in digital cameras, etc.
The Color Balance feature (Image Menu Colors Color Balance) in GIMP essentially offsets a color
cast by increasing its opposite color (Figure 4-6 ). This tool works fairly well on images with very light color
casts, but for most images GIMP offers better methods of correction, as you'll see shortly.
Figure 4-6. Color Balance involves increasing the offending color's opposite
Tutorial 9: Correcting a Color Cast (No. 1)
This photo (Figure 4-7 ) was just one of about a dozen that displayed the same color imbalance, and all
wound up with the same blue tinge. In this tutorial, we'll correct this color cast, using the Filter Pack/Hue
Variations function on this image.
 
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