TYPO3 Core

The same problem is still present on TYPO3 4.1.3. I also experienced it on Debian GNU/Linux 4.0.

I have the problem of same origin on FreeBSD 4.x and 6.x with im6
(I try this on 3 different hosting accounts with FreeBSD):

convert -colorspace GRAY test.jpg test3.gif

convert -colorspace GRAY test.jpg test3.png

does not works (test3.gif test3.png has RGB colors)
But this works fine on Debian and Fedora Core4.
(Please note that "convert -colorspace GRAY test.jpg test3.jpg" works fine on all systems).

The result on this is that GIFBUILDER does not works properly with
EFFECT = gray, because all temporary files have to be gif or png.

The solution is to change option "-colorspace GRAY" to something else.
There are many variants. I use "-type GrayScaleMatte"

The patch shoud be made also for class.t3lib_stdgraphic.php
to change:

case 'gray':
     $commands.=' -colorspace GRAY';
    break;

to

case 'gray':
     $commands.=' -type GrayScaleMatte';
    break;

I think it is good to create $TYPO3_CONF_VARS['GFX']['im_gray_option'] because the behavior on differen systems is really different.

looking to IM this is a bug from versions 6.2.xxx and was fixed with 6.3, so it should work without patch using any version of IM except 6.2.xxx

The proposed patch is no good solution as I have checked the recommended version of ImageMagick ( 4.2.9 ) and the patch does not work as expected ( blank images ) on this version.
As Steffen clarifies this is just a bug in 6.2 of ImageMagick.
Use version 6.3 or 4.2.9.

So this could be closed, no change required, because it's not a TYPO3 problem?

The affected Debian 4.0 (oldstable, etch) systems could solve this with:
- Switch to graphicsmagick
- Upgrade to Debian 5.0 (stable, lenny, comes with im 6.3.7)
- Use imagemagick package from backports.org (they have a imagemagick 6.3.7 lenny to etch backport)

It is indeed a bug in this specific version of ImageMagick. Closed because it has to be fixed outside TYPO3 (i.e. use any other version or GraphicsMagick)