For DWAA/B compressed openexrs, .R and .Y would be lossy compressed, whereas .I would not. So from that perspective either would suffice.
On Wednesday, June 15, 2016, Larry Gritz <[email protected]> wrote: > OK, preliminary proposed fix here: > https://github.com/OpenImageIO/oiio/pull/1434 > > I'll let it sit for a few days for comment before committing. If others > chime in that R is not smart and most people prefer Y or something, we can > revise. > > > > On Jun 14, 2016, at 9:50 PM, Jonathan Tilden (2K) <[email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote: > > For us bc4 (single channel dds) and bc5 (two channel dds for tangent space > normals) are read in shaders as .r/.x or .rg/.xy > > To follow with that logic, I'd just suggest R > > > > Sent from mobile. > > -----Original Message----- > *From: *Larry Gritz [[email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');>] > *Sent: *Wednesday, June 15, 2016 12:41 AM Eastern Standard Time > *To: *OpenImageIO developers > *Subject: *[Oiio-dev] RFC on Auto-naming of channels > > Very few file formats support explicit naming of channels in the files. > For those that don't (i.e., everything but OpenEXR and a couple other > stragglers), we impose a convention: > > * 1 channel is called A. > * 2 channels are I, A. > * 3 channels are R, G, B > * 4 channels are R, G, B, A > * >4 channels are R, G, B, A, channel4, channel5, ... > > I'm concerned now about the 1 and 2 channel cases. "A" is a special name, > and designates a channel as alpha, and there are a variety of places where > where alpha is treated specially. > > So I want to revisit the conventions for naming channels of 1 and 2 > channel images, for formats that don't supply channel names in the file. > > Suggestions? What's the best name for a single channel image? > > R? Y? I (for intensity)? Grey? (ugh, gray?) > > > -- > Larry Gritz > [email protected] <javascript:_e(%7B%7D,'cvml','[email protected]');> > > > _______________________________________________ > Oiio-dev mailing list > [email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');> > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org > _______________________________________________ > Oiio-dev mailing list > [email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');> > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org > > > -- > Larry Gritz > [email protected] <javascript:_e(%7B%7D,'cvml','[email protected]');> > > >
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