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    exif:referenceBlackWhite
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    http://www.w3.org/2003/12/exif/ns#referenceBlackWhite

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    exif:

    lang:en
    ReferenceBlackWhite
    lang:en
    The reference black point value and reference white point value. The color space is declared in a color space information tag, with the default being the value that gives the optimal image characteristics Interoperability these conditions.
    lang:ja
    画像情報の黒点・白点値。YCbCr形式の場合、最初の2つの値がY(輝度)の黒点・白点、次がCb、最後がCrとなり、デフォルト値は'0,255,0,128,0,128'。RGB形式の場合はR、G、Bの順で黒点・白点値が並んでおり、デフォルト値は'0,255,0,255,0,255'。