| Re: TVRD'ing under windows [message #15252] |
Fri, 07 May 1999 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Phil Aldis (philaldis@geocities.com) writes:
> I'm having trouble tvrd'ing under windows, when I'm running 16 bit
> mode, and using decomposed colour. If I display an image, and then
> tvrd it back in and the tv that image, I get a garbled mess. The only
> way I can get a representation of what is on the screen is to set it
> into 24 bit mode, image=tvrd (true=1) and then tv, image, true=1.
>
> I'm not really sure what's going on. Is this anything to do with what
> David was saying a while bakc, that when you're using decomposed
> colous, it runs stuff through the table or something.
Must be something going around, because I just wrote an article
about this last week and posted it on my web page:
http://www.dfanning.com/tips/strange_tvrd.html
You don't have to be in 24-bit mode (at least in IDL
5.2), but you *DO* have to set the TRUE keyword both in
TVRD and on the TV command, and you DO have to have
Decomposed=1 when displaying a 24-bit image on a PC.
(I *really* think this last requirement is a bug, RSI.
Anyone listening?)
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: TVRD'ing under windows [message #15256 is a reply to message #15252] |
Thu, 06 May 1999 00:00  |
Pavel Romashkin
Messages: 166
Registered: April 1999
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Senior Member |
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I remember reading that in order to tvrd/ tv you should have IDL provide
the backing store (device, retain=2). Maybe the Windows backing store is
not communicating with IDL properly in 16-bit mode. I have not tried it
myself, just remembered reading about it.
Cheers,
Pavel
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| Re: TVRD'ing under windows [message #15259 is a reply to message #15256] |
Thu, 06 May 1999 00:00 |
Liam Gumley
Messages: 473
Registered: November 1994
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Senior Member |
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Phil Aldis wrote:
> I'm having trouble tvrd'ing under windows, when I'm running 16 bit
> mode, and using decomposed colour. If I display an image, and then
> tvrd it back in and the tv that image, I get a garbled mess. The only
> way I can get a representation of what is on the screen is to set it
> into 24 bit mode, image=tvrd (true=1) and then tv, image, true=1.
My experience has been using IDL with a 16 bit display is just plain
unreliable, whether it's under Windows or Unix. My advice, play it safe
and use either an 8 bit or 24 bit display.
Cheers,
Liam.
---
Liam E. Gumley
Space Science and Engineering Center, UW-Madison
1225 W. Dayton St., Madison WI 53706, USA
Phone (608) 265-5358, Fax (608) 262-5974
http://cimss.ssec.wisc.edu/~gumley
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