JEITA  CP-3451 - 21 - Type = LONG Default = none JPEGInterchangeFormatLength The number of bytes of JPEG compressed thumbnail data. This is not used for primary image JPEG data. JPEG thumbnails are not divided but are recorded as a continuous JPEG bitstream from SOI to EOI. APPn and COM markers should not be recorded. Compressed thumbnails shall be recorded in no more than 64 Kbytes, including all other data to be recorded in APP1.   Tag = 514 (202.H) Type = LONG Default = none C.    Tags Relating to Image Data Characteristics TransferFunction A transfer function for the image, described in tabular style. Normally this tag is not necessary, since color space is specified in the color space information tag (ColorSpace). Tag = 301 (12D.H) Type = SHORT Count = 3 * 256 Default = none WhitePoint The chromaticity of the white point of the image. Normally this tag is not necessary, since color space is specified in the color space information tag (ColorSpace). Tag = 318 (13E.H) Type = RATIONAL Count = 2 Default = none PrimaryChromaticities The chromaticity of the three primary colors of the image. Normally this tag is not necessary, since color space is specified in the color space information tag (ColorSpace). Tag = 319 (13F.H) Type = RATIONAL Count = 6 Default = none YCbCrCoefficients The matrix coefficients for transformation from RGB to YCbCr image data. No default is given in TIFF; but here the characteristics given in Annex E, "Color Space Guidelines," is used as the default. Tag = 529 (211.H) Type = RATIONAL Count = 3 Default = See Annex E