now I'm at work the best documentation I have is from ITU T.871 which is ISO/IEC 10918-5:
Units for the H (horizontal) and V (vertical) densities: = X'00': units unspecified; H and V densities, expressed in dots per arbitrary unit, specify only the pixel aspect ratio (width:height pixel aspect ratio = Vdensity:Hdensity). which is more explicit than the JFIF 1.02 de facto standard, which was what I read last night. JFIF 1.02 I thought could be read in an ambiguous manner. This is much better, but reinforces something I mentioned to some people yesterday; specifications should come with some form of examples/reference implementation, especially when tying together multiple standards or when there are variations supported due to combining multiple proposals. Kevin _______________________________________________ Oiio-dev mailing list [email protected] http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
