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]<mailto:[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] _______________________________________________ Oiio-dev mailing list [email protected] http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org<http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org>
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