GIFBUILDER support for additional blend-modes
Currently, GIFGUILDER does not support blend-modes other than "over" (gm composite -compose over) for overlaying images. Having modes like "Multiply", "Difference", "Bumpmap", etc. available would greatly enhance the image processing abilities.
(issue imported from #M11130)
#6 Updated by Christian Hennecke about 6 years ago
The blend-mode "over" is currently hard-coded in class.t3lib_stdgraphic.php (at least in TYPO3 4.7, don't know about 6.x). See the function combineExec(). What we need is a new parameter "blendMode" for the IMAGE object that is then used to generate a suitable GraphicsMagick command.
#7 Updated by Chris topher about 6 years ago
The file is GraphicalFunctions.php in 6.x.
However, GraphicalFunctions.php is only the place, where it is hardcoded one time, but when you need the option for the IMAGE object, then you should edit the PHP file, which defines the IMAGE object, add a new option there and remove the hardcoded parameter from combineExec() (as otherwise you would get a command with two blend modes).