[Magick-bugs] quantize introduces black areas (confirmation ofalready posted bug)

[Peter Pimley]

> -----Original Message-----
> From: magick-bugs-bounces at imagemagick.org 
> [mailto:magick-bugs-bounces at imagemagick.org] On Behalf Of 
> Till Oliver Knoll

> Hello!
> 
> I want to backup a bug which has already been reported, but 
> probably turned down:


Hi Oliver,

I originally reported the bug that you refer to.

It's good to see that somebody else was able to reproduce the problem.
Though I did receive an email shortly after my report from Anthony
Thyssen confirming its existence.

I was quite lucky, because all of the images in my data set that
exhibited the problem ALREADY had less than my requried number of colors
(256).  With "identify -verbose" and a bit of sed, I was able to only
execute the "convert" if the images were over 256 colors.

That's a second bug, by the way; sometimes "convert" carries out the
color quantization even if the image already has less than the required
number of colors.

With the help of a few other posters, we found that earlier versions did
not show the problem.  It was only very recently introduced.  6.3.4
seems to be OK, whereas 6.3.5 is not.  Secondly, there were no reports
(either way) from linux users.  This is unsurprising, as they're
probably still on older versions.  Ubuntu 7.04, as well as Debian Etch &
Lenny, still ship with 6.2.4.

Peter Pimley





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