zoomenhance
the Mars anomalies image viewer with realtime enhancements
...The special second version of this filter adjust the contrast independently for any R,G,B layer. This maximizes the visibility of color differences. For example: very useful for images from the Mars-rovers with reduced contrast and color information.
More realtime functions: brightness, contrast, gamma, RGB/HSL, un/sharp, unblur.
You can find configuration notes here in the wiki.