pixfade — darken a pix file
pixfade darkens a color pix file by fading the entire image a fractional amount or by using a pixel value as a maximum level.
The
-f
option specifies a nonnegative fractional multiplier which is used
to scale the red, green, and blue values of each pixel. In a similar
way, the
-p
option is used to specify the multiplier as a nonnegative percentage.
An alternative way to darken the image is to specify a ceiling pixel
level (0 - 255) with the
-m
option. The pixel plotted is the minimum of the ceiling value and the
red, green, and blue levels of the pixel.