Method for preventing clipping in sl-hdrx systems

A device comprising electronic circuitry configured for:

• emulating an implementation of a post-processing process using input color components of a current sample of a current picture up to a computation of at least one intermediate chroma component, the post-processing process being comprised in a process for generating a picture in a first dynamic range from a picture in a second dynamic range and metadata representative of tone mapping parameters and color correction parameters;
• determining that a value of the at least one intermediate chroma component is higher than a maximum chroma component value depending on a calculation precision set in the implementation of the post-processing process;
• applying a correction process on the input color components to obtain corrected color components for the current sample respecting at least a clipping prevention condition and a hue preservation condition responsive to the value of the at least one intermediate chroma component is higher than the maximum chroma component value, the hue preservation condition allows obtaining a hue for the corrected color components in a range of admissible values around the hue of the input color components, the clipping prevention condition allows obtaining an intermediate chroma component value from a modified input color component lower than or equal to the maximum chroma component value;
• replacing the input color components of the current sample by the corrected color components;
• and,
• generating a picture representative of the current picture in the second dynamic range and the metadata wherein the generating comprises applying a pre-processing process on the current sample.