Re: Bug in convert: modulate is broken - introduces colour artefacts
Richard Neill <[email protected]>
| Newsgroups | gmane.comp.video.image-magick.bugs |
|---|---|
| Organization | RUO3.org |
| Message-ID | <[email protected]> |
> Just to let you know, this bug is still present in the current release, > which I downloaded and compiled today, namely: > Version: ImageMagick 6.4.4 2008-10-23 Q16 http://www.imagemagick.org > > I also downloaded the latest beta, ImageMagick-6.4.5-0.tar.gz, and this > is also affected. > > Is there anything else I can do to help fix it? I've narrowed this down to a change that was made in between the following releases. ImageMagick-6.3.9-10 - works correctly ImageMagick-6.4.0-11 - is broken. I can't be any more specific than that, since these are the two closest-spaced releases I find on this page: ftp://ftp.imagemagick.org/pub/ImageMagick/legacy/ Could someone who understands the ImageMagick internals take a look at this, please? Thanks, Richard > > Thanks, > > Richard > > > On Fri, 17 Oct 2008, Richard Neill wrote: > >> Dear developers, >> >> I've just upgraded from Mandriva 2008.1 to 2009.0, and now have a new >> version of convert installed, >> >> -modulate now does something horrible to colours around areas of high >> contrast, although it used to work just fine. >> >> Here is a sample image: >> http://richardneill.org/tmp/example.png >> >> And here is an invocation to show the bug: >> convert example.png -modulate 25 error.png >> >> Here is what I see as a result: >> http://richardneill.org/tmp/error.png >> >> Version: ImageMagick 6.4.2 2008-09-15 Q16 http://www.imagemagick.org >> Copyright: Copyright (C) 1999-2008 ImageMagick Studio LL >> >> The application, btw, is a rather complicated script to generate >> opening/closing titles for a video, and to provide a fade in from black >> at the start. The expected output should be much darker than the input, >> but should not have the ugly colour-errors. >> >> Thanks very much for your help, >> >> Richard >> >> >> >> P.S. Please consider adding a bugzilla for ImageMagick. >> _______________________________________________ >> Magick-bugs mailing list >> [email protected] >> http://studio.imagemagick.org/mailman/listinfo/magick-bugs >> > > _______________________________________________ > Magick-bugs mailing list > [email protected] > http://studio.imagemagick.org/mailman/listinfo/magick-bugs >