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We would like to suggest using an attribute image with possible value as (blackwhite, grayscale, color, unknown). The fact of putting this color indicator is to enable the requesting Office and DAS to apply the appropriate action in processing such document if required (i.e. appropriate conversion in order to minimize the loss of quality in color). This would enable DAS to transmit the document via CD/DVD instead of the agreed protocol (e.g. TDA) if there is such a bilateral technical arrangemnt between DAS and the requesting Office which does not have the technical capability to handle color priority documents.
Therefore, if a document contains many possibilities (e.g. grayscale and color), it would be sufficient to indicate 'color' as attribute value. Similarly, if a document contain both images in grayscale and black and white, we would recommend using 'grayscale' as attribute value.