InterColor Profile Format - CiteSeerX

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InterColor Profile Format Specification Version 3.0 June 10, 1994 ps2RenderingIntentTag redColorantTag redTRCTag screeningDescTag screeningTag technologyTag ucrbgTag viewingCondDescTag viewingConditionsTag PostScript Level 2 Rendering Intent Relative XYZ values of red phosphor Red channel tone reproduction curve Screening attributes description Screening attributes such as frequency, angle and spot Device technology information such as LCD, CRT, Dye Sublimation, etc. Under color removal curve Specifies viewing condition description Specifies viewing condition parameters 5.1 AToB0Tag Tag Types : lut8Type xor lut16Type Tag Signature : ‘A2B0’ 0x41324230 Device to PCS : 8 bit or 16 bit data. The processing mechanisms are described in sections 6.4 and 6.5. 5.2 AToB1Tag Tag Types : lut8Type xor lut16Type Tag Signature : ‘A2B1’ 0x41324231 Device to PCS : 8 bit or 16 bit data. The processing mechanisms are described in sections 6.4 and 6.5. 5.3 AToB2Tag Tag Types : lut8Type xor lut16Type Tag Signature : ‘A2B2’ 0x41324232 Device to PCS : 8 bit or 16 bit data. The processing mechanisms are described in sections 6.4 and 6.5. 5.4 blueColorantTag Tag Type : XYZType Tag Signature : ‘bXYZ’ 0x6258595A The relative XYZ values of blue phosphor or colorant. 26
InterColor Profile Format Specification Version 3.0 June 10, 1994 5.5 blueTRCTag Tag Type : curveType Tag Signature : ‘bTRC’ 0x62545243 Blue channel tone reproduction curve. The first element represents no colorant (white) or phosphors (black) and the last element represents 100 percent colorant (blue) or 100 percent phosphor (blue). The count value specifies the number of entries in the curve table except as follows: when count is 0, then a linear response (slope equal to 1.0) is assumed, when count is 1, then the data entry is interpreted as a simple gamma value (ranging from 0 to 8 in fixed unsigned 8.8 format), and when count is 2, the entries are intepreted as the beginning and end points of a line. Gamma is interpreted canonically and NOT as an inverse. 5.6 BToA0Tag Tag Types : lut8Type xor lut16Type Tag Signature : ‘B2A0’ 0x42324130 PCS to Device space : 8 bit or 16 bit data. The processing mechanisms are described in sections 6.4 and 6.5. 5.7 BToA1Tag Tag Types : lut8Type xor lut16Type Tag Signature : ‘B2A1’ 0x42324131 PCS to Device space : 8 bit or 16 bit data. The processing mechanisms are described in sections 6.4 and 6.5. 5.8 BToA2Tag Tag Types : lut8Type xor lut16Type Tag Signature : ‘B2A2’ 0x42324132 PCS to Device space : 8 bit or 16 bit data. The processing mechanisms are described in sections 6.4 and 6.5. 5.9 calibrationDateTimeTag Tag Type : dateTimeType Tag Signature : ‘calt’ 0x63616C74 Profile calibration date and time. Initially, this tag matches the contents of the creationDateTime header flag. This allows applications and utilities to verify if this profile matches a vendor’s profile and how recently calibration has been performed. 27
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