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Re: Black background in IDL 8.1 map projections? [message #77777 is a reply to message #77776]

Mon, 26 September 2011 08:35

Mark Piper
Messages: 198
Registered: December 2009

Senior Member

On 9/25/2011 7:32 PM, nata wrote:
> I get something similar when I try to save Post Scripts with
> transparency. PS does not support transparency and converts the alpha
> channel to black. Sometimes I have 2 IDLgrImages, one with completly
> tranparent pixels over another image. I have to take both images and
> blend them if I want to create a PS. In you case, I don't know how you
> could solve the problem because I don't like NG and I never use
> them :)
>
> nata

Yes, as nata explains, this is a consequence of how PostScript handles
transparency.

The workaround is to set BITMAP=1 when saving the graphic.
Unfortunately, this explodes the file size.

For future reference, this is logged as CR 62485.

mp

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[Message index]

		Re: Black background in IDL 8.1 map projections? By: David Fanning on Mon, 26 September 2011 10:45
		Re: Black background in IDL 8.1 map projections? By: David Fanning on Mon, 26 September 2011 08:48
		Re: Black background in IDL 8.1 map projections? By: Mark Piper on Mon, 26 September 2011 08:35
		Re: Black background in IDL 8.1 map projections? By: natha on Sun, 25 September 2011 18:32
		Re: Black background in IDL 8.1 map projections? By: David Fanning on Sat, 24 September 2011 07:34

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