Colour and Grayscale Contrast Enhancement


The following illustrates a colour contrast enhancement process and compares this with the grayscale equivalent. The images are arranged in a similar fashion to the page illustrating three modifications of histogram equalization. The colour results have been added, and the Gaussian smoothing results removed.

On your system you may prefer the images arranged horizontally.


BA CA DA
BB CB DB
BC CC DC
BD CD DD

(Click on any image for enlarged version.)
Local-mean
 subtractionOriginalColour original
Fraction 0.65, no
 local meanFraction 0.65,
 local-mean replacementColour, fraction 0.65,
 local-mean replacement
Fraction 0.3, no
 local meanFraction 0.3,
 local-mean replacementColour, fraction 0.3,
 local-mean replacement
Histogram
 equalizedHistogram
 equalizedColour, histogram
 equalized