id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc 909,Confusion in whether coordinates are for luma or chroma samples,peterderivaz,bbross,"There seems to be a general confusion as to whether sample locations for blocks with cIdx>0 is given in luma or chroma samples. The syntax elements seem to consistently use locations in luma samples, but the semantics are less clear. For example, in 8.4.4.1 ""General decoding process for intra blocks"", split_transform_flag is accessed via split_transform_flag[ xB0 << 1 ][ yB0 << 1 ][ trafoDepth ], implying locations in chroma samples. however, in 8.4.4.2.1 ""General intra sample prediction"", equations 8-26 and 8-27 compute what is called ""the luma location"" (based on the same xB0 values), and use PredMode[xBN][yBN], implying locations in luma samples ",defect,closed,trivial,,Text,D9 (K1003) v11,fixed,,bbross wjhan jct-vc@…