| Re: FLASH - Colors Update [message #17232] |
Mon, 20 September 1999 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Liam Gumley (Liam.Gumley@ssec.wisc.edu) writes:
> David Fanning wrote:
>> Liam, I have some more data coming in now (much of it
>> contradictory, as has always been my experience with
>> DirectColor visual classes), but here is one more
>> thing to try. Can you force IDL to get a private
>> color map. Something like this, I think:
>>
>> IDL> Device, Direct=24
>> IDL> Window, Colors=256
>> IDL> Device, Bypass=0
>>
>> I'm told the BYPASS keyword may not be required in
>> IDL 5.2, so you might try with and without.
>
> I still get the same behavior. I also tried
>
> window, colors=-32
>
> but the results were the same.
Yeah, the heck with it. I've never been successful
getting DirectColor to work right. I'm sticking with
my recommendation to use TrueColor and the right
color tools for automatic color updating. :-)
Thanks for trying.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: FLASH - Colors Update [message #17233 is a reply to message #17232] |
Mon, 20 September 1999 00:00  |
Liam Gumley
Messages: 473
Registered: November 1994
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Senior Member |
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David Fanning wrote:
> Liam, I have some more data coming in now (much of it
> contradictory, as has always been my experience with
> DirectColor visual classes), but here is one more
> thing to try. Can you force IDL to get a private
> color map. Something like this, I think:
>
> IDL> Device, Direct=24
> IDL> Window, Colors=256
> IDL> Device, Bypass=0
>
> I'm told the BYPASS keyword may not be required in
> IDL 5.2, so you might try with and without.
I still get the same behavior. I also tried
window, colors=-32
but the results were the same.
--
Liam E. Gumley
Space Science and Engineering Center, UW-Madison
http://cimss.ssec.wisc.edu/~gumley
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| Re: FLASH - Colors Update [message #17235 is a reply to message #17232] |
Mon, 20 September 1999 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Liam Gumley (Liam.Gumley@ssec.wisc.edu) writes:
> So while DirectColor mode does allow immediate graphics update when the
> color table is changed, it also exhibits a very annoying color-flashing
> behavior (at least on my system).
Liam, I have some more data coming in now (much of it
contradictory, as has always been my experience with
DirectColor visual classes), but here is one more
thing to try. Can you force IDL to get a private
color map. Something like this, I think:
IDL> Device, Direct=24
IDL> Window, Colors=256
IDL> Device, Bypass=0
I'm told the BYPASS keyword may not be required in
IDL 5.2, so you might try with and without.
DirectColor has always been extremely problematic
in my experience, but I guess it *can* work if we
figure out how to get it set up correctly.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: FLASH - Colors Update [message #17236 is a reply to message #17232] |
Mon, 20 September 1999 00:00 |
Liam Gumley
Messages: 473
Registered: November 1994
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Senior Member |
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David Fanning wrote:
> Speaking of having your cake and eating it too,
> I just learned what may be the secret for having
> 24-bit color AND having the colors in your IDL
> graphics windows automatically updated when you
> change color tables.
>
> This will work ONLY for those machines (e.g., UNIX)
> which support a DirectColor visual class. Set the
> BYPASS keyword on the DEVICE command to 0, like this:
>
> DEVICE, DIRECT_COLOR=24, BYPASS=0
>
> I can't try this on my machines, but the person who
> passed this tip along to me was pretty sure it would
> work. Make sure you do this before you open any
> graphics windows in your IDL session.
I have an SGI PowerIndigo2 with GR3-Elan 24-bit graphics running Irix
6.5 and IDL 5.2. Here's what happened when I started a new IDL
command-line session without a startup file:
IDL> device, direct=24, bypass=0
IDL> window, /free
IDL> help, /device
Available Graphics Devices: CGM HP LJ NULL PCL PRINTER PS REGIS TEK X Z
Current graphics device: X
Server: X11.0, Silicon Graphics, Release 6300
Display Depth, Size: 24 bits, (1280,1024)
Visual Class: DirectColor (5)
Bits Per RGB: 8
Physical Color Map Entries (Used / Total): 256 / 256
Colormap: Private, 16777216 colors. Translation table: Bypassed
Graphics pixels: Decomposed, 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)
32: Win( 640, 512, Req from Server)
IDL> device, bypass=0
IDL> help, /device
Available Graphics Devices: CGM HP LJ NULL PCL PRINTER PS REGIS TEK X Z
Current graphics device: X
Server: X11.0, Silicon Graphics, Release 6300
Display Depth, Size: 24 bits, (1280,1024)
Visual Class: DirectColor (5)
Bits Per RGB: 8
Physical Color Map Entries (Used / Total): 256 / 256
Colormap: Private, 16777216 colors. Translation table: Enabled
Graphics pixels: Decomposed, 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)
32: Win( 640, 512, Req from Server)
IDL> loadct, 13
IDL> tvscl, dist(256)
IDL> loadct, 1
Note that DEVICE, BYPASS=0 only takes effect after a window has been
created.
The graphics window exhibited the 'color-flashing' behavior I've always
seen in DirectColor mode. That is, the color palette of the entire
display 'flashed' to a different set of colors when the cursor entered
the graphics window.
After the TVSCL command, with the cursor positioned outside the graphics
window, I saw a grey-scale image. When I moved the cursor into the
graphics window, the colors inside the graphics window 'flashed' to the
rainbow color table, and the rest of my desktop flashed to an unpleasant
combination of green, red and blue colors. When I moved the cursor back
to the IDL command line window and executed the second LOADCT command,
the grey-scale image did not change. However when I moved the cursor
back to the graphics window, the image 'flashed' to the blue/white color
table. Unfortunately, so did the rest of my desktop.
So while DirectColor mode does allow immediate graphics update when the
color table is changed, it also exhibits a very annoying color-flashing
behavior (at least on my system).
Cheers,
Liam.
--
Liam E. Gumley
Space Science and Engineering Center, UW-Madison
http://cimss.ssec.wisc.edu/~gumley
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