In V4L2 colorspaces are defined by three values. The first is the colorspace identifier (enum v4l2_colorspace) which defines the chromaticities, the transfer function, the default Y'CbCr encoding and the default quantization method. The second is the Y'CbCr encoding identifier (enum v4l2_ycbcr_encoding) to specify non-standard Y'CbCr encodings and the third is the quantization identifier (enum v4l2_quantization) to specify non-standard quantization methods. Most of the time only the colorspace field of struct v4l2_pix_format or struct v4l2_pix_format_mplane needs to be filled in. Note that the default R'G'B' quantization is full range for all colorspaces except for BT.2020 which uses limited range R'G'B' quantization.