| Re: WIN NT/95 DEVICE, DECOMPOSED=0 [message #12910] |
Mon, 14 September 1998 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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R. Bauer (r.bauer@fz-juelich.de) writes:
> I found in one of the readme.txt the command: DEVICE, DECOMPOSED=0
> It will switch if the graphic card is in true color mode to an indexed
> color mode of 8bit.
No, I'm quite sure it didn't say that (although I can't find the
reference to be sure). I think what it probably said was that
setting DECOMPOSED=0 allows you to specify colors *as if* you
were using the indexed color mode. In other words, you don't
have to do this to get your plot in a yellow color:
IDL> Plot, data, Color='00ffff'x
Instead, you can do this:
IDL> TVLCT, 255, 255, 0, 10
IDL> Plot, data, Color=10
> Set this keyword to 0 to cause the least-significant 8 bits of the color
> index value to be interpreted as a PseudoColor index. This setting
> allows users with DirectColor and TrueColor displays to use IDL programs
> written for standard, PseudoColor displays without modification.
I think this is a true statement, as far as it goes, although
it doesn't cause you to anticipate the problems you inevitably
encounter below.
> I found following differences to the real 8bit graphic mode.
>
> 1. tvrd() did not work!
> the results are very surprising me
You are obviously not keeping up with the articles on my
web page. ;-)
Try this one:
http://www.dfanning.com/tips/tvrd_16bit.html
> 2. if I change the color table e.g. loadct,2 the colors on screen won't
> refresh. I have to start the application again to get the result in
> the new colors.
Try these articles:
http://www.dfanning.com/tips/colors24.html
http://www.dfanning.com/tips/noxloadct.html
http://www.dfanning.com/tips/24bit_color_idl51.html
I am finding that I *love* to run IDL in 24-bit mode.
I can have as many color tables as I like, I don't have
to worry about direct graphics programs and object graphics
programs working together, I get *great* color saturation,
etc. The only problem is writing programs that work with
color tables properly when I change the color tables.
For that, you can read this article:
http://www.dfanning.com/tips/identical_graphics.html
Of course, my book explains all of this in even more
detail. :-)
Cheers,
David
----------------------------------------------------------
David Fanning, Ph.D.
Fanning Software Consulting
E-Mail: davidf@dfanning.com
Phone: 970-221-0438, Toll-Free Book Orders: 1-888-461-0155
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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