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From: | Brendan Bolles |
Subject: | Re: [Openexr-devel] PIZ-Compression / Multithreading |
Date: | Fri, 11 Dec 2009 20:48:11 -0800 |
On Dec 11, 2009, at 3:31 PM, Florian Kainz wrote:
I don't know how Nuke works, but if it reads scan lines top-to- bottom or bottom-to-top (as opposed to accessing the scan lines in random order),then reading chunks of 16 lines might actually be faster than reading individual lines. Also, with 16-line chunks you tend to get slightly better compression.
If you're zoomed out in Nuke, the scanline renderer is only drawing every Nth scanline, so with Zip it will only decode and cache the lines it needs. That's why Zip is a good choice for Nuke. Virtually every other program reads the whole file every time, so Zip16 performs a little better for them.
Brendan
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