| 摘要 |
A computer system processes encoded digital data representing an image at image portions. The image at each portion has color coordinates S1, S2, S3 in a first color coordinate system (CCS), wherein S1√{square root over (T12+T22+T32)}, S2=T2/S1, S3=T3/S1, wherein T1, T2, T3 are color coordinates in a predefined 70%-orthonormal linear CCS. For each image portion whose color coordinate S1 is in a predefined range, the encoded digital data comprise color coordinates s1, s2, s3 such that: s1=kB·(ln(αS1)+β) rounded to an integer, whereαandβare predefined constants, s2=kef·S2/S1 rounded to an integer, s3=kef·S3/S1 rounded to an integer, wherein kef is about 3—kB, or kef is equal to the smallest power of 2 which is greater than or equal to about 3·kB. The processing comprises using the encoded digital data to perform editing, and/or displaying, and/or decoding the encoded data.
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