SHOWIMAGE(7) Miscellaneous Information Manual SHOWIMAGE(7)
showimage - bitmap displayer, colormap changer
showimage [ option ] [ file ... ]
Showimage displays the bitmap contained in file in the top left corner
of the current window. It goes to the next file when any character is
typed, exiting when there are no more files. The options, all of which
require no file, are:
-c Load the standard Plan 9 colormap, if this is an 8-bit display.
The standard colormap takes the value of a pixel byte and uses
the top 3 bits for red darkness, the next 3 bits for green dark-
ness, and the final 2 for blue darkness. So 0 is white and 255
is black. Exceptions: pixels 85 and 170 are intermediate grey
values, so that 2-bit-per-pixel grey scale images look right.
-g Load the colormap with a linear grey scale, from 0 (white) to
-r Load the colormap with a reverse linear grey scale, from 0
(black) to max (white).
Load the colormap from the file mapfile. See rgbpix(2) for the
-d Dump the current colormap to standard output in the format of
Some sample pictures.
graphics(2), rgbpix(2), intro(9), getmap(9.1)