[TYPO3-dev] resized 24bit PNGs (RGBa) are to heavy in filesize - any tipps?

[Franz Koch]

Hey there,

on a current project I have to work with 24bit PNG images (images with 
alpha channel). Those images get resized and displayed quite nicely, but 
the file size is way to big, compared to the size when I export the same 
image in the same size from Photoshop or any other software. (Typo3 = 92 
kB, Photoshop = 31 kB)

I searched the web to find some imageMagick parameter I could add in 
order to reduce the file size, but didn't succeed so far. So I wanted to 
ask you for help. Can anybody give me a hint what parameters I need?

And if somebody knows how I can apply this parameters only to PNG files 
if I get trouble with other image formats, that would also be nice. If 
not I have to xclass t3lib_stdgraphic or something. Thanks.

-- 
kind regards,
Franz Koch