David Fanning <david@dfanning.com> wrote:
: Gary Hodges(gary.hodgesREMOVE@cires.colorado.edu) writes:
:> I've read through several historical "color" threads and even bought the book
:> (IDL Programming Techniques), but I'm still only able to plot gray scale.
:> I've just followed the "Drawing Line Plots in Color" on page 25 of the
:> Fanning book without success. The exact commands are (time and curve
:> are already defined):
:>
:> IDL> TVLCT, [70,255,0], [70,255,255], [70,0,0], 1
:> IDL> Plot, time, curve, Color=2, Background=1
:>
:> This produces a black plot window. To see anything I have to increase the
:> color value to ~50, with higher values producing progressively less gray
:> plots. I gather this goes against what I'm trying to do with the above TVLCT
:> command, which is I understand things, to assign three RGB colors to indexes
:> 1, 2 and 3.
:>
:> I have also tried "IDL> Device, Decomposed=0" trick without success.
: Humm. I find this hard to believe. :-)
Me too!
: Did you try this *before* the two commands above?
: I presume you did.
Sure. I started with "Creating Line Plots" on page 20 even though I have a
pretty good handle on that. I generated Figure 1, then skipped over to
"Creating Your Own Plot Symbols." When the plot symbols didn't come out in
color, I went to the next section to try and get my line to plot in color.
: Try this. Start IDL, open a window (use the Window command),
: the send us the contents of a Help, /Device command.
: Something is not right in Denmark.
IDL> help, /Device
Available Graphics Devices: CGM HP LJ NULL PCL PRINTER PS REGIS TEK X Z
Current graphics device: X
Server: X11.0, The XFree86 Project, Inc, Release 40100000
Display Depth, Size: 24 bits, (1600,1200)
Visual Class: DirectColor (5)
Bits Per RGB: 8 (8/8/8)
Physical Color Map Entries (Used / Total): 256 / 256
Colormap: Private, 16777216 colors. Translation table: Bypassed
Graphics pixels: Combined, Dither Method: Ordered
Write Mask: 16777215 (decimal) ffffff (hex)
Graphics Function: 3 (copy)
Current Font: <default>, Current TrueType Font: <default>
Default Backing Store: Req from Server.
Window Status: ---------------------
id typ( x, y, backing store) id typ( x, y, backing store)
0: Win( 640, 512, Req from Server)
:> Curiously, if I move the plot window on the desktop I get a horizontal pink
:> and pink bar stretching across the screen.
: Yes, quite curious. I have no idea what it might mean.
I think this is probably a Linux/X issue, and not IDL. I tried adding the
TRUE_COLOR=24 that was suggested by Ralf, and while it didn't change much, if
I move the plot window on the screen the plot appears in color. That is,
while the plot window is being moved, the colorful plot appears. Along with
that pink/pink horizontal bar.
Cheers,
Gary
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