[Magick-bugs] Convert change in 6.4.5-8??

Peter Fales psfales at alcatel-lucent.com
Wed Nov 19 12:54:47 PST 2008


In moving from 6.4.5-7 to 6.4.5-8, we've noticed a change in the behavior 
of the convert command.   I can't find anything in the mailing list or
ChangeLogs that would lead me to believe that this was intentional.  

Start with a 640x480 png image, then run:

	convert foo.png -thumbnail 150x150 foo.gif

With the 6.4.5-7 version of convert, running identify on foo.gif would yield:

  foo.gif GIF 150x113 150x113+0+0 8-bit PseudoClass 64c 3.89kb 

but with 6.4.5-8, the result is:

  foo.gif GIF 150x113 640x480+0+0 8-bit PseudoClass 64c 3.21kb 
                      ^^^^^^^
	
Since the "screen descriptor" is still set to 640x480, the web 
browser is treating it as a 640x480 image, though only the 150x113
pixels in the corner are actually used.

-- 
Peter Fales
Alcatel-Lucent
Member of Technical Staff
2000 Lucent Lane
Room: 1C-436
Naperville, IL 60566-7033
Email: psfales at alcatel-lucent.com
Phone: 630 979 8031


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