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Re: Keep getting a transparent background on a composite image [message #90747 is a reply to message #90745]

Wed, 08 April 2015 19:12

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

simulana@gmail.com writes:

> It's hard to see the problem if you open up the png on a browser, because the browser natively has a white background. However if you open up the png with a photoviewer like Picasa or against a black background you will see that the background of the border of the image is transparent (anywhere there is not a cgimage plot).
>
> So I guess my problem has something to do with the device command, or some other thing missing. I have tried setting !P.Background, but with no apparent effect.

Well, I've tried a number of photo viewers, but I have to admit I don't
see any problems with the output. I put it in Lightroom, which has a
black background, and I don't see any black at all around the border of
any image. In fact, the PNG image appears to me to have a white
background, as I would expect from a PNG created from a PostScript file.

If you are saying that your images don't always fill up your image
positions, I can believe that. That would be a result of using the two
keywords I mentioned before simultaneously and would be a mistake.

Anyway, still not sure what your real question is. The output looks
great to me.

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		Keep getting a transparent background on a composite image By: simulana on Wed, 08 April 2015 14:26
		Re: Keep getting a transparent background on a composite image By: David Fanning on Wed, 08 April 2015 16:35
		Re: Keep getting a transparent background on a composite image By: simulana on Wed, 08 April 2015 19:00
		Re: Keep getting a transparent background on a composite image By: simulana on Wed, 08 April 2015 19:12
		Re: Keep getting a transparent background on a composite image By: David Fanning on Wed, 08 April 2015 19:12
		Re: Keep getting a transparent background on a composite image By: simulana on Thu, 09 April 2015 06:12
		Re: Keep getting a transparent background on a composite image By: David Fanning on Thu, 09 April 2015 06:14
		Re: Keep getting a transparent background on a composite image By: simulana on Thu, 09 April 2015 07:47

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