[TYPO3-core] RFC #13406: thumbs.php: Thumbnails for images with transparent background look ugly

[Andreas Wolf]

This is an SVN patch request.

Type: Bugfix

Bugtracker references:
 http://bugs.typo3.org/view.php?id=13406

Branches:
 TYPO3_4-1
 TYPO3_4-2
 TYPO3_4-3
 trunk

Problem:

When viewing a thumbnail generated by thumbs.php for a file in the
backend, the background of transparent images gets filled and looks
really ugly. This seems to be related to a downsampling of the image's
colordepth. This downscaling is done in t3lib/thumbs.php, presumably to
save disk space and bandwidth.


Solution:

Do not downsample the color depth of images in thumbs.php.

As lines are faster and disks are cheaper now than 2003, this is
unneccessary. So the whole downscaling for GIFs and PNGs should be
removed. Attached patch fixes this.


Regards
Andreas
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