Re: Bug in convert: modulate is broken - introduces colour artefacts

Dear All,

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?

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
>