Hi Steven,
Would you explain me how you do your editing/filtering/compositing in Y'CbCr ? I am trying to use y4merge but i am not sure to go the right path. Cheers seb Steven M. Schultz wrote: >On Wed, 6 Jul 2005, Matto Marjanovic wrote: > > > >>One thing though: in the frame you sent me, about 10% of the pixels >> are clipped in the initial conversion to R'G'B' --- these are Y'CbCr >> values in the orginal frame which lie outside of the R'G'B' color >> cube. When they are clipped (projected/forced into the R'G'B' cube), >> they will generally appear brighter (the Y' of the clipped pixel will >> be higher than the original Y' value). >> >> > > The reverse also be, possibly, a problem? When going from R'G'B' > to broadcast range Y'CbCr the clip/core to 16-235 and 16-240 can > cause luma dimming and color shifts (saturated red is particularily > nasty to deal with). > > > >> be no visible transition between the frames with 'effects' and those >> without? Or doing the work in Y'CbCr colorspace [all non-ideal for >> a few reasons]. Or writing tools which will handle negative R'G'B' >> >> > > Hmmm, that's not what I've found to be the case. Can you elaborate > on why doing all the work in Y'CbCr is non-ideal? So far I've found > doing the rendering/filtering/compositing/etc work in Y'CbCr format > (with 10bit per sample data the math in done with 32bit floating point) > gives fantasically good results. > > Cheers, > Steven Schultz > > > >------------------------------------------------------- >SF.Net email is sponsored by: Discover Easy Linux Migration Strategies >from IBM. Find simple to follow Roadmaps, straightforward articles, >informative Webcasts and more! Get everything you need to get up to >speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click >_______________________________________________ >Mjpeg-users mailing list >Mjpeg-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/mjpeg-users > > > > ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
