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Re: Alpha Blending inside of Widgets / Graphic Objects in Widgets [message #33841]

Fri, 31 January 2003 09:49

Karl Schultz
Messages: 341
Registered: October 1999

Senior Member

"Kay Bente" <k.bente@fz-juelich.de> wrote in message
news:b1dulh$3naa$1@zam602.zam.kfa-juelich.de...
> Hi,
>
> for the first part of your answer, I think you misunderstood me, i was
> thinking about to put an IDLgrImage or IDLgrWindow, or what ever of these
> objects i need (i don�t like objects) inside a Widget_Base, to display an
> image fusion.

If you want to do blending then I think you'll have to use Object Graphics
if you want the graphics support to do the blending for you. You can do a
lot of work and do the blending yourself with IDL code, but that's might be
slow and the amount of work involved depends a lot on what you are doing.

In IDL 5.6, the only objects that can really be blended are Images and
Polygons/Surface via a texture map.

You can configure Widget_Draw to use Object Graphics (GRAPHICS_LEVEL=2) and
then you can put your objects in that widget window.

> Or as another solution would it be possible, do get the fusioned image as
a
> truecolor image (256,256,3)-array out of an object.

You can use IDLgrBuffer to make an "off-screen" rendering buffer. You can
draw your objects into the buffer and then extract an RGB image.

If you can tell us more about what you want to draw, we can help more.

Also, there have been quite a few postings on this topic. You might want to
use Google to search the newsgroup for words like "transparency", "alpha",
"blending", etc.

Karl

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[Message index]

		Re: Alpha Blending inside of Widgets / Graphic Objects in Widgets By: Karl Schultz on Fri, 31 January 2003 09:49
		Re: Alpha Blending inside of Widgets / Graphic Objects in Widgets By: Rick Towler on Fri, 31 January 2003 09:09
		Re: Alpha Blending inside of Widgets / Graphic Objects in Widgets By: David Fanning on Fri, 31 January 2003 06:42
		Re: Alpha Blending inside of Widgets / Graphic Objects in Widgets By: Kay Bente on Fri, 31 January 2003 05:45
		Re: Alpha Blending inside of Widgets / Graphic Objects in Widgets By: Rick Towler on Thu, 30 January 2003 09:54

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