| 摘要 |
<p>An apparatus for generating interpolator input data (41) for a color space conversion from a RGB color space to a CMYK color space includes an address generator (43) having eight outputs and a memory (42) having eight inputs each connected to one of the address generator outputs. The inputs to the address generator (43) are the three sets of four higher order bits, RH, GH, and BH, of the twenty four bit RGB color space value and two bits for selecting one of the dimensions in the CMYK space to which the conversion will be directed. From these inputs, the address generator (43) can generate 19,652 addresses for accessing interpolator input data stored in the memory (42). The address generator (43) simultaneously generates eight addresses for accessing interpolator input data stored in the memory (42). The memory (42) is divided into eight memory banks (42a-42h) with the interpolator input data assigned to the eight memory banks (42a-42h) so that for any RGB color space input value, the eight values used for interpolation in the conversion to one dimension of the CMYK color space can be simultaneously accessed in the memory (42). The apparatus for generating interpolator input data (41) uses a look-up table expanded from 4096 to 4913 interpolation values for each of the dimensions of the CMYK color space. The look-up table for all four dimensions of the CMYK color space is stored in a memory (42) having a capacity of 19,652 bytes partitioned into eight memory banks (42a-42h) ranging in size from 2048 bytes to 2916 bytes. By using the expanded look-up table, interpolator input data can be generated for the case in which the input RGB color space value lies on the outer boundary of the RGB color space. <IMAGE></p> |
