Dithering/True Color on PI, Indigos

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2 total messages Started by Mike Goza Wed, 06 Jan 1993 13:57

#78

Author: Mike Goza
Date: Wed, 06 Jan 1993 13:57

18 lines
1334 bytes

I have a PI (and assume the following problem is on indigos as well)
and I am in double buffer mode.  I wish to cpack a color and draw
polygons without lighting.  This in effect color codes polygons which
I use for different applications.  I check the number of bitplanes 
available and do not let the color range exceed the value for the 
number of colors available.  This method of coloring polygons works
great on all machines except the ones that dither.  My question is 
this...Can I turn the dithering OFF so the machine will use the cpacked
color I pass it while staying in double buffer mode?  I would have thought
it would have used the value in cpack.  I am passing cpack a long int in the
form of 0xAABBGGRR as per the man pages.  Does this need to be different 
for 12 bitplanes?  Is there anything that can be done to fix this?

Any help would be appreciated.  Please email or post.

Thanks,
Mike Goza
goza@cheers.jsc.nasa.gov

Re: Dithering/True Color on PI, Indigos

#79

Author: Peter Daifuku
Date: Wed, 06 Jan 1993 18:13

17 lines
990 bytes

In article <1993Jan6.135721.15635@aio.jsc.nasa.gov>, goza@norm.JSC.NASA.GOV (Mike Goza) writes:
|> My question is 
|> this...Can I turn the dithering OFF so the machine will use the cpacked
|> color I pass it while staying in double buffer mode?
|> Any help would be appreciated.  Please email or post.
|> 
|> Thanks,
|> Mike Goza
|> goza@cheers.jsc.nasa.gov


Dithering is on by default. You can turn it off using the dither command.
man dither should give you all the info you need.


Peter Daifuku
daifuku@sgi.com

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