🚀 go-pugleaf

In article <SCHULTZ.93Jan8170850@halley.est.3m.com> schultz@halley.est.3m.com (John C. Schultz) writes:
>Basically I do not understand how colormaps should/can be used.  For a
>single band image is it valid to think of them as a lookup table?
> ...
>  For example the kitten
>image distributed with Khoros looks the same on an 8 bit SPARC display
>whether I use the colormap or not.   Why?

hi,
 
sorry, i do not understand the question, but the task is quite simple:

one-band khoros images look like this:

header map image-data
------=====+++++++++++++++...

if there IS a map, and you use putimage to display the image,
a byte/int/short from the image-data is taken and
map[image-data] is displayed.

if you use "putimage -use_cmap false" the "raw" image-data WITHOUT
the map information is used.

the image-processing tools ALWAYS use the mapped information,
so it is NOT GOOD to add optional maps INSIDE the image.
you can use "stand allown" map-files with the "[-cmap_image]"
parameter form putimage.

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