Color ImagesThis plugin can be used for batch colors enhancement of images in an Album. It uses the convert program from the ImageMagick package. A plugin effect preview (partial or full) is available. Ten color filter types are available:
Decrease Contrast: reduces the image contrast.
Depth: changes the color depth of the image.
Equalize: performs histogram equalization to the image.
Fuzz: merges colors within a distance are considered equal.
Gray scales: converts colors images to gray scales image.
Increase Contrast: enhances the image contrast.
Monochrome: transforms the image to black and white.
Negate: replaces every pixel with its complementary color.
Normalize: transforms image to span the full range of color values.
Segment: segments an image by analyzing the histograms of the color components.
Trim: trims an image (fuzz reverse technic).
You can see some samples built with this plugin at this URL.