| Re: Two Images in One Window - Like oplot or /NOERASE [message #27750] |
Thu, 01 November 2001 07:09  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Emmler, Oliver (oemmler@ix.urz.uni-heidelberg.de) writes:
> I produce two images in IDL
>
> a) Reference
> b) ROI of Reference
>
> Now i want to draw first the reference image an then plot the roi with
> another colortable like it is possible for plots with oplot or the keyword
> /noerase. Is there any possibility to do so ?
Commands that display images (e.g. TV) never
erase the display, so put as many images on the
display at once as you like. You can even overlap
them, etc.
If you are on a 24-bit display, just load a new
colortable before you display the second image.
If you are on an 8-bit display you will have to
divide your color table and scale your images
appropriately. Here is an article that describes
how:
http://www.dfanning.com/color_tips/twocolortables.html
Is it just me, or does the whole notion of
8-bit displays sort of date you. It's kind of
like mentioning the Mamas and the Papas, it
seems to me. :-(
Cheers,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@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: Two Images in One Window - Like oplot or /NOERASE [message #28934 is a reply to message #27750] |
Tue, 22 January 2002 21:13  |
Paul Joe
Messages: 2
Registered: January 2002
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Junior Member |
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the problem with 24 bit displays is if you want to create a 8bit gif image with
256 shades in each image.
David Fanning wrote:
> Emmler, Oliver (oemmler@ix.urz.uni-heidelberg.de) writes:
>
>> I produce two images in IDL
>>
>> a) Reference
>> b) ROI of Reference
>>
>> Now i want to draw first the reference image an then plot the roi with
>> another colortable like it is possible for plots with oplot or the keyword
>> /noerase. Is there any possibility to do so ?
>
> Commands that display images (e.g. TV) never
> erase the display, so put as many images on the
> display at once as you like. You can even overlap
> them, etc.
>
> If you are on a 24-bit display, just load a new
> colortable before you display the second image.
> If you are on an 8-bit display you will have to
> divide your color table and scale your images
> appropriately. Here is an article that describes
> how:
>
> http://www.dfanning.com/color_tips/twocolortables.html
>
> Is it just me, or does the whole notion of
> 8-bit displays sort of date you. It's kind of
> like mentioning the Mamas and the Papas, it
> seems to me. :-(
>
> Cheers,
>
> David
>
> --
> David W. Fanning, Ph.D.
> Fanning Software Consulting
> Phone: 970-221-0438, E-mail: david@dfanning.com
> Coyote's Guide to IDL Programming: http://www.dfanning.com/
> Toll-Free IDL Book Orders: 1-888-461-0155
--
Paul Joe
paul.joe@ec.gc.ca
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