[TYPO3-english] Alpha transparent PNG with GIFBUILDER and masks

[Rudy Gnodde (WIND Internet)]

Hello Bernhard,

Bernhard Kraft wrote:
> I am not absolutely sure. Back in 2005 I did a lot of changes to the
> GIFBUILDER / t3lib_stdGraphic, (I introduced the png_truecolor flag) But
> AFAIR it is not possible to create alpha-layer images using the GIFBUILDER.
> 
> There is only 0/1 transparency.
> 
> I guess what you would like to achieve, is to add the mask-image as
> alpha channel for the specified "file". But in face the "mask option
> works different:
> 
> When you have an image in your gifbuilder-object. probably defined by
> 5 = IMAGE
> in your case, then the GIFBUILDER file/mask options "overlays" the
> specified file over the "current" one, using the "mask" file as
> overlay-information.
> 
> so this is rather only useful for overlaying one image over another
> using a specified mask - and not for setting the alpha-layer of a png file.
> 
> I guess best solution to accomplish this, would be to create your own
> little extension, using imageMagick to accomplish this task.

That's what I thought, but I was hoping I was wrong. It shouldn't be too 
much trouble to make it myself, but it would have been easier if it was 
already there. Thanks for your answer.

Regards,

Rudy