I must admit to not fully understanding samplerTransform, and why
calling it twice would be a problem. The page here: http://developer.apple.com/documentation/GraphicsImaging/Conceptual/
CoreImaging/ci_gslang_ext/chapter_6_section_3.html#//apple_ref/doc/
uid/TP30001185-CH206-BCIEGAIJ
is not very clearly worded on which space what coordinates are in,
and when you should try to convert them. A short page describing
coordinate systems in QC and/or Core Image, and what functions
convert between which spaces, would really help, and if I get to
understand it sufficiently, I'll try to write such a page on the wiki.
--Sam
On Jun 11, 2005, at 10:42 PM, Ralph Brunner wrote:
Hi,
note that the kernel code below has a bug, in that the sampler
transform is applied twice. This will fail in interesting ways if
the sampler transform is not identity (when Core Image tiles the
evaluation for example).
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