Thank you! On Tue, Oct 4, 2016 at 4:57 PM Peter Hillman <pet...@wetafx.co.nz> wrote:
> Hi Chad, > > I'm afraid I only have an unhelpful answer for you: it's best to test and > work out what works best for you. > > I reckon the five important metrics in picking a compression scheme are: > > - Write time > - Read time > - File size on disk > - Quality (if using a lossy compression scheme) > - Compatibility with other tools > > Compatibility could be an issue for the DreamWorks schemes, DWAA and DWAB, > as it was introduced in OpenEXR-2.2.0 and may not be supported in all your > tools yet. The other metrics depend on the kind of images you are creating, > your software, and your system setup. Compression schemes behave > differently depending on the image content and the rendering algorithm. > Also, how you choose to trade off time against storage space and image > quality is really up to you, so it's hard for anyone else to give a > definitive answer. > > Given that, I'd suggest running your own tests to decide. You might try > all the schemes with exactly the same image sequence and compositing setup, > measuring the total time it takes to render the images, the compositing > time, and the file size. Beware that timing tends to be quite variable for > all sorts of incidental reasons that may not be anything to do with the > compression scheme. For lossy compression, you could check the final images > look OK to you compared to a lossless compression approach (e.g. ZIP). > > Personally I'd avoid lossy compression on images that will be further > processed unless there's a clear win elsewhere that's important to you. I'm > guessing that "Lossy 16-bit float, in blocks of 16 scan lines" is the "B44" > scheme. "B44A" may well be a better choice than B44, but it would be worth > running tests of all options anyway. > > Peter > > On 29/09/16 03:00, Chad Ashley wrote: > > Hello, > > This is my first posting to this list, so good morning everyone! I had a > question: When should one use the B44A compression? > > I am a 3D artist rendering primarily out of Arnold and I normally use > "Lossy 16-bit float, in blocks of 16 scan lines" compression. Should I look > to use the B44A compression instead? What are the upsides and downsides (if > any)? Or, should I be using a completely different compression? > > 3D App: C4D > Renderer: Arnold > Compositor: Fusion, After Effects > > Thank You, > > -chad > > > _______________________________________________ > Openexr-devel mailing > listOpenexr-devel@nongnu.orghttps://lists.nongnu.org/mailman/listinfo/openexr-devel > > >
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