[gentoo-user] ImageMagick -contrast-stretch

[gentoo-user] ImageMagick -contrast-stretch

[John Green]

Hi,

The ImageMagick option -contrast-stretch is not recognised
in my installation (6.2.5 01/31/06 Q16).  The option is documented on the
IM web-site.

If the option exists on your installationi, or you have any insights,
please reply here with your version, so I can decide whether and
where to file a bug-report.

You can do something like this:

convert input.jpg -contrast-stretch 10% output.jpg

Thanks.

J Green
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] ImageMagick -contrast-stretch

[Alexander Skwar]

John Green wrote:
> Hi,
> 
> The ImageMagick option -contrast-stretch is not recognised
> in my installation (6.2.5 01/31/06 Q16).  The option is documented on the

> convert input.jpg -contrast-stretch 10% output.jpg

Seems to work.

[09:06:44 vz6tml@dewup-ww02:/tmp] $ convert input.jpg -contrast-stretch 10% output.jpg
[09:06:55 vz6tml@dewup-ww02:/tmp] $
[09:06:55 vz6tml@dewup-ww02:/tmp] $ convert -version
Version: ImageMagick 6.2.6 01/27/06 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2006 ImageMagick Studio LLC

Maybe you might want to consider upgrading to the current version.

Alexander Skwar
-- 
No man is an island, but some of us are long peninsulas.
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] ImageMagick -contrast-stretch

[Martins Steinbergs]

[-- Attachment #1: Type: text/plain, Size: 417 bytes --]

On Friday 03 February 2006 09:51, John Green wrote:
> convert input.jpg -contrast-stretch 10% output.jpg

my installation is working with this

media-gfx/imagemagick-6.2.6.0  USE="X jpeg mpeg perl png tiff truetype xml2 
zlib -bzip2 -doc -fpx -graphviz -gs -jbig -lcms -nocxx -wmf"


m
-- 
Linux 2.6.15-ck2 AMD Athlon(tm) 64 Processor 3200+
 10:05:47 up 55 min,  6 users,  load average: 1.05, 1.74, 2.41

[-- Attachment #2: Type: application/pgp-signature, Size: 189 bytes --]

Re: [gentoo-user] ImageMagick -contrast-stretch

[John Green]

Martins Steinbergs wrote:

>On Friday 03 February 2006 09:51, John Green wrote:
>  
>
>>convert input.jpg -contrast-stretch 10% output.jpg
>>    
>>
>
>my installation is working with this
>
>media-gfx/imagemagick-6.2.6.0  USE="X jpeg mpeg perl png tiff truetype xml2 
>zlib -bzip2 -doc -fpx -graphviz -gs -jbig -lcms -nocxx -wmf"
>
>
>m
>  
>
Thanks to Martin and Alexander.

Upgrading fixed the problem, as you suggested.

To get the upgrade, I added media-gfx/imagemagick to
/etc/portage/package.keywords, so my system will now
iupgrade to every new version of ImageMagick that has an ebuild.
The last automatic upgrade I saw (January 26)
was to version 6.2.5.5 to fix security bug #83542.  
I can't be sure from the ImageMagick ChangeLog that
the security fix is also in 6.2.6.0.  Am I worrying about nothing?

Thanks again,

John Green
-- 
gentoo-user@gentoo.org mailing list