Encoding and decoding pictures in of high dynamic range and wide color gamut format

A method comprising decoding a block of a picture represented in a current representation format, wherein a representation format of the block of picture is defined by a color gamut, a transfer function and a peak luminance;

• and wherein said decoding of a block of a picture further comprises:
• receiving a bitstream representative of a coded block of picture, an indication representative of a dQP table among a plurality of dQP tables, and an indication representative of a QP offset;
• determining a quantization parameter QP responsive to said current representation format for a luma color component of the coded block, said quantization parameter QP being based on a dQP table specified by said indication representative of the dQP table and based on a QP offset specified by said indication representative of the QP offset;
• decoding the luma color component of the coded block of the picture using the determined QP.

A device

• comprising at least one processor configured to decode a block of a picture represented in a current representation format, wherein a representation format of the picture block is defined by a color gamut, a transfer function and a peak luminance;
• and wherein said at least one processor is further configured to:
• receive a bitstream representative of a coded block of picture,
• an indication representative of a dQP table among a plurality of dQP tables, and an indication representative of a QP offset;
• determine a quantization parameter QP responsive to said current representation format for a luma color component of the coded block, said quantization parameter QP being based on the dQP table specified by said indication representative of a dQP table and based on the QP offset specified by said indication representative of a QP offset;
• decode the luma color component of the coded block of the picture using the determined quantization parameter QP.