| Color woes [message #25042] |
Mon, 14 May 2001 20:19 |
Richard French
Messages: 173
Registered: December 2000
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Senior Member |
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Hi, folks -
I am posting this for a friend who does not have access to this
newsgroup. She is having trouble displaying images in color - I sent
her to David Fanning's device,decomposed=0 page but she is still having
trouble. I asked her to provide information about the version of IDL,
her machine, operating system, graphics card, and a coded example of the
specific problem she has. Here is her reply. I hope some of you color
experts can pass on a suggestion to her about what to try. Thanks!
(Please post reply here, but feel free to cc: to Rebecca at
rdanos@astro.ucla.edu if you think you can help her directly.)
My hunch is that her machine is set up for 16-bit color, but I can't
be sure.
Thanks everyone,
Dick French
> 1) version of IDL, and info about the display
> IDL> print,!version
{ sparc sunos unix 5.4 Sep 25 2000 32 64}
> IDL> help,/device
When I do this I get an error:
Available Graphics Devices: CGM HP LJ NULL PCL PRINTER PS REGIS TEK X Z
Current graphics device: X
% Unsupported X Windows visual (class: StaticGray, depth: 0).
Substituting default (class: <UndefinedVisual>, Depth: 0).
% Execution halted at: $MAIN$
> 2) machine and operating system (and version) - if you
> are running Linux, I'd need to know the graphics card
> you are using.
I've been coming accross this problem on two different Linux systems and
one SunOs. One of the Linux computers is just a PC and says it has a
generic graphics device. It runs version RedHat 6.0. Another Linux PC
I tried runs RedHat 6.1 and also says it has a generic graphics device
but
also says it uses device "Matrox|MGA G200 AGP [Millennium] AGP".
>
> 3) the specific error message you get when you try
> device,decomposed=0
>
IDL> device,decomposed=0
% Unsupported X Windows visual (class: StaticGray, depth: 0).
Substituting default (class: <UndefinedVisual>, Depth: 0).
% Execution halted at: $MAIN$
> Another thing you might want to do is to try these
> commands first thing after starting IDL - I have them
> in my startup file:
These didn't work either.
> device,true_color=24
It will display the image, but not in the specified color table.
> window,/FREE,/PIXMAP,colors=-10,xsize=10,ysize=10
> wdelete,!d.window
> device,decomposed=0,retain=2
> device,get_visual_depth=depth
> print,'Display depth: ', depth
> print,'Color table size: ', !d.table_size
First of all, I don't get errors only when I start off with the
device,true_color=24 or pseudo_color=16. The errors I get are:
% Unsupported X Windows visual (class: StaticGray, depth: 0).
Substituting default (class: <UndefinedVisual>, Depth: 0).
% Execution halted at: $MAIN$
> in IDL that attempts to display what you want but fails,
> you can send that along, including a description of what
> went wrong.
>
Here is a demonstration:
image = Congrid(Dist(200), !D.X_Size, !D.Y_Size)
device,true_color=24
loadct, 11
tv,image
I get this:
IDL> image = Congrid(Dist(200), !D.X_Size, !D.Y_Size)
% Compiled module: DIST.
% Compiled module: CONGRID.
IDL> device,true_color=24
IDL> loadct, 11
% Compiled module: LOADCT.
% Unsupported X Windows visual (class: TrueColor, depth: 24).
Substituting default (class: TrueColor, Depth: 16).
% Compiled module: FILEPATH.
% LOADCT: Loading table BLUE-RED
IDL> tv,image
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