| Re: TVRD to make GIF's with 24-bit color [message #17151] |
Wed, 15 September 1999 00:00 |
Joe Means
Messages: 44
Registered: November 1996
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Member |
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Thanks to David and Liam for your help with this. I'll be using your
ideas soon.
Joe Means
Joe Means wrote:
> Hi, I run WinNT on a PC and IDL 5.2.1. I use the statement:
> Device, Decomposed=0
> to use colortable mapping and produce some fine images in screen
> windows.
>
> Then I read them in amd make GIF's:
> imgA = TVRD()
> Write_Gif, 'image_a.gif', imgA
>
> These GIF's however, have mostly white colors. Any ideas?
> Joe Means
> Forest Science Dept,
> Oregon State univ.
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| Re: TVRD to make GIF's with 24-bit color [message #17163 is a reply to message #17151] |
Wed, 15 September 1999 00:00  |
Liam Gumley
Messages: 473
Registered: November 1994
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Senior Member |
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Joe Means wrote:
Joe, just so we're clear: GIF files can only contain 8-bit images. If
you have displayed a 24-bit image and you wish to save it as a GIF, then
you must use TVRD(TRUE=1) and COLOR_QUAN to produce an 8-bit pseudocolor
image. If you wish to save a truecolor 24-bit image, then the JPEG and
TIFF formats are a good choice.
The SAVEIMAGE procedure mentioned in my previous post handles all of
this automatically. You just pick the output format, e.g.
IDL> saveimage, 'image.gif' ; GIF is the default
IDL> saveimage, 'image.jpg', /jpeg
IDL> saveimage, 'image.tif', /tiff
Cheers,
Liam.
--
Liam E. Gumley
Space Science and Engineering Center, UW-Madison
http://cimss.ssec.wisc.edu/~gumley
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| Re: TVRD to make GIF's with 24-bit color [message #17164 is a reply to message #17151] |
Wed, 15 September 1999 00:00 |
Liam Gumley
Messages: 473
Registered: November 1994
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Senior Member |
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Joe Means wrote:
> Hi, I run WinNT on a PC and IDL 5.2.1. I use the statement:
> Device, Decomposed=0
> to use colortable mapping and produce some fine images in screen
> windows.
>
> Then I read them in amd make GIF's:
> imgA = TVRD()
> Write_Gif, 'image_a.gif', imgA
>
> These GIF's however, have mostly white colors. Any ideas?
Joe,
You may wish to try my SAVEIMAGE procedure, available at
http://cimss.ssec.wisc.edu/~gumley/imagetools.html
To save the current window to a GIF, it's as simple as
IDL> saveimage, 'image.gif'
Cheers,
Liam.
--
Liam E. Gumley
Space Science and Engineering Center, UW-Madison
http://cimss.ssec.wisc.edu/~gumley
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| Re: TVRD to make GIF's with 24-bit color [message #17166 is a reply to message #17151] |
Wed, 15 September 1999 00:00 |
R.Bauer
Messages: 1424
Registered: November 1998
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Senior Member |
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David Fanning wrote:
> Joe Means (means@fsl.orst.edu) writes:
>
>> Hi, I run WinNT on a PC and IDL 5.2.1. I use the statement:
>> Device, Decomposed=0
>> to use colortable mapping and produce some fine images in screen
>> windows.
>>
>> Then I read them in amd make GIF's:
>> imgA = TVRD()
>> Write_Gif, 'image_a.gif', imgA
>>
>> These GIF's however, have mostly white colors. Any ideas?
>
> Uh, read my web page? :-)
>
> http://www.dfanning.com/tips/strange_tvrd.html
>
> Cheers,
>
> David
>
You are very patient David, I believe thats's the most important
question behind the decomposed one.
Reimar
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