| Re: changing the color map without having to re-load an image [message #30053 is a reply to message #29973] |
Wed, 03 April 2002 14:01  |
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Stein Vidar Hagfors H[1]
Messages: 56
Registered: February 2000
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Member |
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David Fanning <david@dfanning.com> writes:
> Marc Sauvage (msauvage@cea.fr) writes:
[..]
>> Which solves this problem. So now I can use colors, any color table,
>> in fact. I can modify the color table with xloadct, and I see the
>> color table changing in the xloadct widget, but these changes do not
>> affect the already opened graphics window and I have to reload the
>> images to see the changes (I' ve tried setting retain to 2 but I don't
>> think this addresses my problem). This is a pain because in my field,
>> astronomy, I have to do this almost all the time to actually see
>> what's in the images, and explore the structure of the objects.
>>
>> I checked on both the Mac and the unix server which types of visual
>> were supported (with xpdyinfo) and apparently the same types are
>> supported on both side. Currently I'm set to true_color. Also worth
>> knowing: my version of IDL is 5.4.
>>
>> Anyone with ideas on how to solve this problem is welcome.
>
> Welcome to the world of 24-bit color, Marc! :-)
Yes, brave new world and all that. Wonderful progress we've had, when
you can no longer interactively modify and view the results of color
table changes without making or using a full-fledged
application... Sort of takes the I out of IDL, as I've said a few
times before. But I guess astronomers & fellow tinkerers are not the
main group of customers - if we had been, a proper system would have
been worked out (i.e. for any direct graphics window, you can
associate a certain color table, which you can modify independently of
the others. They do it in object graphics, but those are not really
something you'd like to play with from the IDL> prompt directly ;-)
By the way, on my system (1) I *can* do what you want (with some
pointing and clicking in the display windows after startind xloadct),
so it is quite platform/visual dependent.
(1)
{ sparc sunos unix 5.3 Nov 11 1999}
Current graphics device: X
Server: X11.0, Sun Microsystems, Inc., Release 6410
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: 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)
--
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Stein Vidar Hagfors Haugan
ESA SOHO SOC/European Space Agency Science Operations Coordinator for SOHO
NASA Goddard Space Flight Center, Email: shaugan@esa.nascom.nasa.gov
Mail Code 682.3, Bld. 26, Room G-1, Tel.: 1-301-286-9028/240-354-6066
Greenbelt, Maryland 20771, USA. Fax: 1-301-286-0264
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