[TYPO3-core] Bugfix #760 GIFBUILDER 256 colors

[Michael Stucki]

Hi René & Bernhard,

>> 1. I dislike to introduce two more options to $TYPO3_CONF_VARS[GFX].
>> Suggestions instead:
>> - Use "gif" internally unless $TYPO3_CONF_VARS[GFX][gdlib_png] is set.
> 
> I agree and I disagree.
> 
> New option is not nice.
> 
> To make rendering internally truecolor PNG is needed, but that has nothing
> todo with gdlib_png which defines the final output format.
> 
> What about a runtime check like is_callable('imagePNG')?

+1

Michael
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