Plan 9 - man page for showimage (plan9 section 7)
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showimage - bitmap displayer, colormap changer
showimage [ option ] [ file ... ]
Showimage displays the bitmap contained in file in the top left corner of the current win-
dow. 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 col-
ormap takes the value of a pixel byte and uses the top 3 bits for red darkness, the
next 3 bits for green darkness, 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 max (black).
-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 format.
-d Dump the current colormap to standard output in the format of rgbpix(2).
Some sample pictures.
graphics(2), rgbpix(2), intro(9), getmap(9.1)
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