Stefan Boehringer wrote:
As a sidenote Willem Rein Oudshoorn pointed out in private mail that
[compositeToPoint:fromRect:operation:fraction:] is not equivalent to either of
the DPS operators DPScomposite or DPSdissolve. This method is new to MacOSX. Is
it just a wrapper for a sequential call of the above operators or does it do
anything new?
Yes, this is new, but I don't think it does a sequential call to the
above operators. It will rather use the alpha value given by the
fraction instead of the alpha values from the original images. But this
is also only a guess.
Fred probably means pixelwise blending by the "simple and slow implementation"
(do you?). Maybe such a trivial implementation may be enough for dissolving such tiny
images as icons.