re DPX log image

Bob and I have had some DPX discussion off-line. This is to recap.

Bob says the DLAD test image is linear, not log, and asked if I could get 
him some DPX log images for testing. I don't have any images cleared to 
release, but will try to get some. May take a month. Has been on my to-do 
list for some time to make such images available. With Bob's prompting I 
hope to get it done soon.

Bob asked about the CinePaint log-linear conversion process. I haven't 
looking into that code myself, but here's how it reportedly works.

We bit-shift so that the middle part of the 10-bit log curve is in the
middle of the 16-bit linear range. The top and bottom ranges are off of
course, but the image still looks presentable. Because bit-shift is
perfectly reversable, unmodified pixels suffer no damage on a round trip.
Bit-shift is also extremely fast.

Robin
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www.CinePaint.org - Open source digital motion picture software




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