Re: opacity

On Fri, 28 May 2004, Patrick Welche wrote:
>
> and I was confused by the outcome, because gm display out.png shows
> a ragged circular outline. The whole point of using the mask, was
> essentially to use the automatic antialiasing of the mask to get
> semitransparent pixels and avoid seeing the pixelation. I just

GraphicsMagick's display program does not support a full opacity 
channel under X11.  This is apparently due to X11's capabilities.  A 
work-around is to composite the image on top of a background pattern 
image so you can see the effect of the opacity channel.  A 
checkerboard image is commonly used (ala GIMP) as the background 
pattern to overlay the image on.

I have been thinking about adding built in background compositing 
(optionally enabled) to the X11 display program.  This was already 
done for the Windows version.

Bob
======================================
Bob Friesenhahn
[email protected]
http://www.simplesystems.org/users/bfriesen


-------------------------------------------------------
This SF.Net email is sponsored by: Oracle 10g
Get certified on the hottest thing ever to hit the market... Oracle 10g. 
Take an Oracle 10g class now, and we'll give you the exam FREE.
http://ads.osdn.com/?ad_id=3149&alloc_id=8166&op=click