TAILIEUCHUNG - COLOR MANAGEMENT- P11

COLOR MANAGEMENT- P11: ICC White Papers are one of the formal deliverables of the International Color Consortium, the other being the ICC specification itself – ISO 15076: Image technology color management – Architecture, profile format, and data structure. The White Papers undergo an exhaustive internal development process, followed by a formal technical review by the membership and a ballot for approval by the ICC Steering Committee. | 284 Profile Construction and Evaluation Finite precision of computation and rounding operations give rise to relatively small differences on roundtripping. These will depend largely on the CMM used to apply the profile but the profile generator can minimize such differences by using 16-bit data in LUTs. In situations where the magnitude of roundtrip errors is too high for a particular application higher precision floating point LUT encodings using DToBx and BToDx tags could be considered. In a BToAxTag output values are given at uniformly spaced intervals for the entire PCS encoding. Many of the values in the PCS will be outside the gamut of the data encoding and the BToAxTag maps these out-of-gamut colors to coordinates within the range of the data encoding. In the AToBxTag all input values have an output value in the PCS and no mapping of out-of-gamut colors is required. In the colorimetric intents only the values within the gamut of the data encoding can be roundtripped accurately while in the perceptual and saturation intents only colors within the Perceptual Reference Medium used in the profile BToAx and AToBx tags can be roundtripped accurately. The effective device values are the set of device values that results from mapping the entire PCS to the output encoding. It is only possible to roundtrip to within this set of values. The AToBTag maps these device values to the PCS which enables the effective gamut to be determined. The profile can only accurately roundtrip within this gamut. For example a given CMYK value has a unique PCS value in the AToBxTag but when this PCS value is converted back to the data encoding with the BToAxTag the resulting CMYK value will depend on the black generation and ink limiting choices made during profile generation and not on the starting CMYK value. Since the colorimetric intents in a profile must be measurement based it is implicit that the BToA1Tag is required to be an accurate inverse of the AToB1Tag. A preview or proof of

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