Hi Zachary, The difference between ZIP and ZIPS is that ZIPS compresses a single line at a time whereas ZIP does it in chunks.
For reference, http://openexr.com/TechnicalIntroduction.pdf, pp16 On 4 January 2017 at 15:16, Larry Gritz <[email protected]> wrote: > In EXR speak, "zip" is the usual deflate/zip compression in blocks of 16 > scanlines, and "zips" is the same compression method, but applied to each > scanline individually. Both are supported by OIIO. > > The compression/decompression is handled on the OpenEXR library side, not > by the OIIO code itself, so in theory anything should be fine with either > one. Though I do see a comment in my code indicating that only "zips" has > been found to be reliable for deep files. > > Can you give more detail about what's going wrong? You're rendering out an > exr with "zips"? Writing it with OIIO? Then it's "borken" when you > "process" them... in what way is it broken, how processed, in what program > does it appear broken? (Is that when also reading with OIIO, or some other > app?) > > Which versions of OIIO and OpenEXR are you using? > > Can you either send me one of these broken files to inspect, or else give > a recipe for how to create one (ideally using only OIIO components)? > > > On Jan 4, 2017, at 2:28 PM, Zachary Bauer <[email protected]> > wrote: > > Hello, > A question about OIIO compression support: > > I am having redshift output Multi-Part EXRs and their headers say their > compression is "zips". Typically what I see is "zip" compression for my > EXRs from other renderers (PRMAN). Processing these redshift images using > Open Image IO is resulting in broken images, but if I convert them to "zip" > compression using oiiotool first, everything seems to work ok. > > Is "zips" compression different than "zip"? > Does OIIO support "zips"? > > Thanks, > Zachary Bauer > Senior Software Engineer (Tools) > Blizzard Entertainment > > _______________________________________________ > Oiio-dev mailing list > [email protected] > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org > > > -- > Larry Gritz > [email protected] > > > > _______________________________________________ > Oiio-dev mailing list > [email protected] > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org > >
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