A mechanism for processing video data is disclosed. A value of an i-th depth nonlinear representation model (depth_nonlinear_representation_model[i]) syntax element is determined. The depth_nonlinear_representation_model[i] syntax element is specified to be in a range of A to B, where A and B are integers and A is less than B. A conversion is performed between a visual media data and a bitstream based on the depth_nonlinear_representation_model[i] syntax element.