color_subsampling_mode in JPEG_​Parameters

Name: color_subsampling_modeVersion Id:
Description: The color_subsampling_mode attribute specifies the JPEG color subsampling mode used during compression. Valid values: '4:2:2' - 4:2:2 chroma subsampling, which is the typical case, '4:4:4' - 4:4:4 chroma sampling, which indicates no subsampling, 'Grayscale' - indicates a grayscale image
Namespace Id: imgSteward: imgClass Name: JPEG_​ParametersType: ASCII_​Short_​String_​Collapsed
Minimum Value: NoneMaximum Value: NoneMinimum Characters: 1Maximum Characters: 255
Unit of Measure Type: NoneDefault Unit Id: NoneAttribute Concept: NoneConceptual Domain: SHORT_STRING
Status: ActiveNillable: falsePattern: None
Permissible Value(s)ValueValue Meaning
 4:2:2indicates 4:2:2 chroma subsampling. The typical case. The two chroma components are sampled at half the sample rate of luma: the horizontal chroma resolution is halved. This reduces the bandwidth of an uncompressed video signal by one-third with little to no visual difference.
 4:4:4Indicates 4:4:4 chroma sampling. Each of the three Y'CbCr components have the same sample rate, thus there is no chroma subsampling
 Grayscaleindicates a grayscale image