| 摘要 |
The invention concerns a method and device for the conversion of colorimetric values for a colour negative (3) in accordance with a positive/negative inversion function Rp, Gp, Bp = f (Rn, Gn, Bn). Opto-electronic scanning of the colour negative (3) in a colour scanner (1) enables colorimetric values (Rn, Gn, Bn) to be obtained for the three colour components. From the colorimetric values (Rn, Gn, Bn), the exposure value (BLr, BLg, BLb) and image-depth value (BTr, BTg, BTb) are determined for each colour component of the negative (3) in an image analyser (12), as well as the associated density ranges ( DELTA Dr, DELTA Dg, DELTA Db). From the density ranges ( DELTA Dr, DELTA Dg, DELTA Db) and a defined density range ( DELTA D'), the positive/negative inversion function is determined in a calculation stage (15). The positive/negative inversion function is stored as a value table in a table memory (16). The colorimetric values (Rn, Gn, Bn) for the negative (3) are then converted, using the table stored in the memory, to the corresponding colorimetric values (Rp, Gp, Bp) for the positive.
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