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Tint is a cool freeware utility by Martin Wennerberg that adjusts the color balance of images. For example, this shot of a PowerBook 1400 has a distinct bluish/purplish cast. A simple adjustment of the blue saturation corrected it to a more neutral cast. 
Color adjustments with original color near the pixel color are applied more, whereas color adjustments that differ in original color from the pixel color have little or no effect. This allows the changing of different colors separately (eg. make the gray greener but leave the white and black as they are). 
Click in the image to add new color adjustments. You can add both colors that you want to change and colors you want to keep constant. Click the color in the adjusted column in the color adjustment drawer to set it to set the target color you want. Pixels with color close to the original color will be adjusted to the target color. Letting the target color be the same as the original color for a color adjustment makes colors like the original color remain unchanged. 
A few color adjustments are created as default. They make black, white, red, green and blue stay constant which limits the effect of color adjustments you add. Disable these, or completely remove them if they conflict with the color adjustments you want to do. You can change the default settings for new images under the Tint menu. Here are a few of the many color adjustment palette options. 
A color adjustment can be applied as an RGB (Red, Green, Blue) change, or as a change in HSB (Hue, Saturation, Brightness). This gives slightly different effects. RGB is faster and usually a good setting. Read more about HSB by clicking the “Working with hue...” link below. This is an amazingly powerful and capable application for freeware, but the color adjustment process is a bit slow.. One way to speed things up is to work on a smaller version of your image that you’ve scaled down in some other imaging application until you’re satisfied with the color balance. Then drag in your large image in the document window to replace the small one, wait for it to calculate and then save it. (Automating this is a planned feature for a future version of Tint.) I encountered a bit of bugginess, but nothing too serious. New in this version:
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