Sebastien Leon wrote: > Back again :-) This WE, I implemented some basic premultiplied alpha > support.
Something that occurred to me rather a long time ago while reading one of Jim Blinn's articles in CG&A, is that (at least in principle), the multi-dimensional nature of color lookups could be used to handle various matting operations. For instance, in theory the RGBA case could be handled as a normal color lookup using a 4D color table, which would take care of the alpha de-multipliying & re-multiplying using the standard mechanisms. In practice it may not be a good use of an extra dimension, since the tables blow up in size or the resolution and speed drops rapidly as you increase the number of input dimensions, and vector instructions are rather fast in modern CPU's. Graeme Gill. ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
