[TYPO3-core] RFC #8878: Bug: Fix cropscale behaviour for transparent GIF

[Felix Buenemann]

Jigal van Hemert <jigal at xs4all.nl> wrote:
> On 16-7-2010 17:28, Felix Buenemann wrote:
>> Problem:
>> When using cropscale on an image with transparent background, the
>> parameters for cropping differ between im4 and im6, due to how they
>> handle the transparent canvas. This leads to incorrect cropping when
>> using im5 or im6.
>> 
>> Solution:
>> Adapt behaviour according to im_version_4 flag and revert to pre
> > #8025
>> behaviour when im5/6 are used.
> 
> The '!' flag for cropping was introduced with ImageMagick version
> 6.2.4-6 [1]. So for earlier versions of IM6 and IM5 this will not
> work.
> 
> Because TYPO3 4.5 will support IM4,5 and 6 I don't think this will be
> the right solution :-(
> 
> [1] http://www.imagemagick.org/Usage/crop/#crop_viewport

I'll try to come up with a solution that works across the board...

-- 
- Felix Buenemann