seashore
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grayscale image operations do not work on older OSX
similar in cause to issue #47
The graphics context does not support gray with alpha for rendering.
Bummer - OSX 10.9 doesn't support it (10.9 is the minimum supported OSX version now)
This has been fixed in 3.17. Everything internally is now ARGB - which uses more memory, but simplifies a lot of code.