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List:       imagemagick-user
Subject:    Transparency problem
From:       Joe Piskor <jpiskor () teleline ! es>
Date:       2001-08-26 7:00:02
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Hi all!
	I'm having a transparency problem with a script I've migrated from a system 
with the 4.2.9 version of ImageMagick and one running v5.2.7. The code giving 
me trouble is

# make the background of the cloud image transparent                  
/usr/X11R6/bin/mogrify -transparent black default.gif 

# layer the clouds on top of the topo background and save it 
/usr/X11R6/bin/combine -compose over topo_full.png default.gif fused_full.gif 
                    
The source image (default.gif) has the area I wish to have transparent set to 
black by the generating software.

This code works perfectly under 4.2.9, but under the newer version sets to 
transparent an intermediate color index. As a workaround, I've brought the 
older version executables (and libraries) over to the other system, renamed 
them as mogrify.old and combine.old, and am successfully generating the 
image.  ( http://www.nemoc.navy.mil/nemoc/prods/products/wmo/nsds/false.jpg )

I'm not fond of kludges, and have tried some other things as well (starting 
with a png, for example) with the same results.

Any ideas?


-- 
====================================================
   Joe Piskor - Programmer/Analyst - CSC-Ploenzke
Meteorological and Oceanographic Product Development
            NAVEURMETOCCEN, Rota, Spain
     piskorj@nemoc.navy.mil; jpiskor@teleline.es
----------------------------------------------------
   ...and the Penguins shall inherit the Earth...
  (Either you get it, or you just don't *get* it!)
====================================================

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