On Oct 27, 2009, at 9:41 AM, George Toledo wrote: I thought I had been clear that the bug was in the Constant Color; I didn't mean for anyone to wind up spending time looking at the sprite. ("In short, if the color value of the Constant Color is set to 0,0,0,0, it no longer outputs an image; it shuts down.) This has been that way for a while... In Tiger, images with zero alpha were legitimate, but then Core Image changed the behavior in 10.4.3 or 10.4.4 and now they just optimize down to nil. I'm inclined to agree with you all that constant color should return an image whose contents are transparent. Otherwise, it's really difficult to fade out an image and rely on the image size being constant. On the other hand, creating an image with transparent borders does not require a crop patch which can be convenient: |
ZeroAlpha.qtz
Description: application/quartzcomposer
It's a gotcha, so watch out. The recommended workaround is to create the custom CIFilter that outputs a color as discussed earlier in the thread.
We take bugs very seriously here, we just don't have a lot of time to respond to emails when we're trying to make Quartz Composer better :) We do appreciate the help that many of you give to your peers, and the bugs that all of you write. Troy |
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