Originally Posted by Bob Sorel
Lossless remapping of what??? Remapping a wider color space down to REC 709 or remapping REC 709 content to a wider color space? If the former, then there is no use for such a feature, and if the latter, then there is no consumer source material available (that I am aware of) that utilizes a color space larger than REC 709....other than maybe some games. And remapping REC 709 to a wider color space would be a guessing game at best, as there is no way to know what "value" a certain color coordinate should be mapped to outside of REC 709.
Or maybe I am misunderstanding your point completely....
Yes, the display uses a wider colourspace, Mark bluntly states this 'is plain wrong', well it isn't. 709 material can easily be remapped to a wider colourspace, then the source material starts to match the display, again. And since the colourspace is widened, the remapping will be lossless. A researcher I know told me many years ago that management at the large TV manufacturer was considering which way to go, wide space display's with remapping or limiting the display's colourspace. His department didn't care as they had good algorithms to support either way.