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Re: Display two images on one position [message #28660 is a reply to message #28659]

Sun, 23 December 2001 14:57

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Oliver Emmle (oemmler@ix.urz.uni-heidelberg.de) writes:

> i want to display two images on one position. I do this by using the
> attached Code becuase i don't want the pixels of IMAGE being erased when
> using the TV function for HIGHLIGHT.
>
> My Question:
> - Is there a shorter way to display to images like in the code ?
> - Is it possible to set some of the pixels of one image transparent ?
>
> Can anyone help ?

You can find an article on how to create
transparent images in both direct graphics and
object graphics here:

http://www.dfanning.com/color_tips/color_overlay.html

> TV, image
> LoadCT,5
> FOR x = 0,510 DO BEGIN
> FOR y = 0,510 DO BEGIN
> IF highlight(x,y) NE 0 THEN TV, highlight(x:x+1,y:y+1),x,y
> ENDFOR
> ENDFOR

At the very least, you can speed this code up
tremendously by doing this:

TV, image
LoadCT, 5
TV, highlight * (highlight NE 0)

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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[Message index]

		Re: Display two images on one position By: Craig Markwardt on Wed, 02 January 2002 14:57
		Re: Display two images on one position By: Emmler, Oliver on Wed, 02 January 2002 07:14
		Re: Display two images on one position By: David Fanning on Mon, 24 December 2001 09:37
		Re: Display two images on one position By: Emmler, Oliver on Mon, 24 December 2001 00:51
		Re: Display two images on one position By: David Fanning on Sun, 23 December 2001 18:27
		Re: Display two images on one position By: David Fanning on Sun, 23 December 2001 14:57

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