colormap-invert!
Synopsis
(colormap-invert! colormap)
Parameters
- colormap
Description
This procedure inverts the supplied colormap applying a fuzzy “not” to each channel component of a pixel (regarding 0 as logical false and 255 as logical true).
Side Effects
The colormap is modified.
Return Value
The inverted colormap is returned.
Example
> (define image (colormap-readjpg "horses.jpg"))
image
> (colormap-writejpg (colormap-invert! image) "horses-inverted.jpg")
ok
>
The input image displays as follows (horses.jpg, JPG, 2400x1600):
The inverted image looks like this:
