The Stretch Contrast.
Like “Stretch Contrast”,
however, there may be hue shifts in the resulting image. This command
operates on layers from RGB images. If the image is Indexed or Grayscale,
the menu item is insensitive and grayed out.
command automatically adjusts the colors of the active layer by stretching
the Red, Green and Blue channels separately. To do this, it discards pixel
colors at each end of the Red, Green and Blue histograms which are used by
only 0.05% of the pixels in the image and stretches the remaining range as
much as possible. The result is that pixel colors which occur very
infrequently at the outer edges of the histograms (perhaps bits of dust,
etc.) do not negatively influence the minimum and maximum values used for
stretching the histograms, in comparison with
Activating the Command
“White Balance” example
Image after the command