[Sorry if this is a bit off-topic for the list; is there a "user questions" list?]
First, thank you for this library! It's vastly nicer than every other generic image library I've ever encountered -- every other such library I've found has been basically unusable (e.g. by requiring image I/O be done on entire images at once, etc). OIIO is the first one that's good enough to actually use! Second, a question: Is there a way I can tell OpenImageIO "whatever the output format is, use the 'normal' data-type for that format."? Currently, all my internal image data is floats. The OIIO library makes it simple to handle this: I can just use TypeDesc::FLOAT to ImageOutput::write_scanline, and it takes care of any conversion necessary. However, if I specify TypeDesc::FLOAT when _opening_ the output image, OIIO will basically use the deepest data-type it can for the output format, and often this isn't actually what I want. Really what I want is to use the "normal" data-type for the output format; e.g. for an EXR file, I'd like it to use HALF (which is almost always good enough, is what's "expected", and of course saves a lot of disk space). For PNG files, I'd actually like it to use 8-bits by default (OIIO chooses 16-bits for PNG); this is maybe more controversial, but again, the idea is that if the user specified a PNG file, they're probably expecting it. [Of course it would be good to have a way for the user to override such defaults and choose a deeper data-type when he really wants that... but that's an issue for my program, not OIIO.] I can do this, I suppose, by making my own mapping of format names to desired output data-types, but this seems obviously fragile and arguably something I shouldn't have to do when using a generic image I/O library. Is there some feature in OIIO that would let me easily do this...? Or maybe some future extension? [I'm not entirely sure what exactly the right thing to do is in every circumstance, but ... the idea is that when the user specifies a filename, the default output should roughly match what he _expects_, and this has as much to do with convention as it does with actual capability.] Thanks, -miles -- History, n. An account mostly false, of events mostly unimportant, which are brought about by rulers mostly knaves, and soldiers mostly fools. _______________________________________________ Oiio-dev mailing list [email protected] http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
