| Re: Plotting results from z-buffer are diffrenet than xwindow. [message #89028 is a reply to message #89027] |
Wed, 16 July 2014 13:30   |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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jlpippitt@comcast.net writes:
> I tried it with IDL version 6.3 and 8.2, both give the same result. Check out the images in question on the link below. They were created from the same data file, one in Z-buffer and one in x-window.
>
> http://gpm-gv.gsfc.nasa.gov/Radar/zbuff_ZZ.gif
Well, the images look exactly like you would expect if you don't pin the
data coordinate space down by using the position keyword with what I
presume is a Map_Set command in your drawing program. That was my
original suggestion. The "smoothing" effect might go away if you fix
that problem.
Or, the smoothing effect could also be caused by possibly not using the
same number of colors in the X device and Z-graphics buffer. Do you have
some kind of pre-1970s code in your IDL start-up file that somehow
restricts the number of colors you are using? It looks to me like
something fewer than 256 colors are being used on the display device.
You could check by doing a "HELP, r" after you issue this command:
tvlct, r, g, b, /Get
Make sure these vectors are the same size in both devices.
How are you specifying your drawing colors?
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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