Twas brillig at 20:23:17 17.08.2009 UTC+10 when ras...@rasterman.com did gyre 
and gimble:

 CHR> hmm - no that's grayscale. grayscale is a gray only verison of
 CHR> pseudocolor.  staticgray == linear allocation of gray values (ie
 CHR> what i described). at least so it says in the x protocol reference
 CHR> manual X11 release 6, page 412 and 417.  :)

"For PseudoColor, a pixel value indexes a colormap to produce
independent RGB values; the RGB values can be changed
dynamically. GrayScale is treated in the same way as Pseudo- Color
except which primary drives the screen is undefined; thus, the client
should always store the same value for red, green, and blue in
colormaps."

"StaticColor is treated in the same way as PseudoColor except the
colormap has predefined read-only RGB values, which are
server-dependent. StaticGray is treated in the same way as StaticColor
except the red, green, and blue values are equal for any single pixel
value, resulting in shades of gray."

So, PseudoColor -> RGB palette, may be changed. GrayScale -> grayscale
palette, may be changed.

StaticColor -> RGB palette, predefined colors. StaticGray -> grayscale
palette, predefined colors.

Hence, no direct grayscale visual, only palettized ones :(

-- 
  http://fossarchy.blogspot.com/

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