Using the backgroundPattern seems intuitive, but read the fine print:
image dimensions have very specific requirements, and not heeding those
can yield unpredictable results.
Earlier this year I had a project that used backgroundPattern as a way
to use the graphic shape to mask an image. It worked well in most
circumstances, with a satisfying range of images sizes - until it didn't.
We eventually found some images that would render at a fraction of
actual size, tiling across.
I had to ditch it and find another approach, which led to the thread
here a few months ago about keyhole effect.
The result of that is you can use a graphic placed on top of an image as
a mark, with the graphic's backgroundColor set to black and the ink set
to blendDstIn.
That combo will give you a lot of flexibility for centering and even
resizing your masking graphic over the image.
--
Richard Gaskin
Fourth World Systems
Software Design and Development for the Desktop, Mobile, and the Web
____________________________________________________________________
ambassa...@fourthworld.com http://www.FourthWorld.com
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