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guint8 numcomps = 0; /* Number of components in image
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(1 for gray, 3 for YUV, etc.) */
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guint8 precision; /* precision (in bits) for the samples */
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guint8 blockWidth[3]; /* Array[numComponents] giving the number of
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blocks (horiz) in this component */
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guint8 blockHeight[3]; /* Same for the vertical part of this component */