 chroma4x4BlkIdx ), are assembled into a 2x2 matrix, and a 2x2 transform is applied to the DC transform coefficients of these blocks according to Equation 8-427 resulting in DC transform coefficients dc;ip. These DC transform coefficients are then quantised with the quantisation parameter QSc, as given by: = (Abs( dcup) * LevelScale2( QSc % 6, 0,0)+(1<<(15+QSc/6))))> 16+QSc/6) with i,j=0,1 (8-439) The parsed chroma DC prediction residual transform coefficients, ChromaDCLevel iCbCr with k = 0..3 are added to these quantised DC transform coefficients of the prediction block, as given by: dcij = dejj + ChromaDCLevel[ iCbCr [[*2+i] with i,j=0,1 (8-440) The 2x2 array f with elements fij and i, j 0..1 is derived using Equation 8-430. The 2x2 array f with elements fij and i, j=0..1 is copied as follows: Rec. ITU-T H.264 (01/2012) coo(j*2+i)=fiwithi,j=0,1 (8-441) Deblocking filter process A conditional filtering process is specified in this clause that is an integral part of the decoding process which shall be applied by decoders conforming to the Baseline, Constrained Baseline, Main, Extended, High, Progressive High, Constrained High, High 10, High 4:2:2, and High 4:4:4 Predictive profiles. For decoders conforming to the High 10 Intra, High 4:2:2 Intra, High 4:4:4 Intra, and CAVLC 4:4:4 Intra profiles, the filtering process specified in this clause, or one similar to it, should be applied but is not required. The conditional filtering process is applied to all NxN (where N = 4 or N=8 for luma, N = 4 for chroma when ChromaArrayType is equal to 1 or 2, and N = 4 or N = 8 for chroma when ChromaArrayType is equal to 3) block edges of a picture, except edges at the boundary of the picture and any edges for which the deblocking filter process is disabled by disable_deblocking_filter_idc, as specified below. This filtering process is performed on a macroblock basis after the completion of the picture construction process prior to deblocking filter process (as specified in clauses 8.5 and 8.6) for the entire decoded picture, wi