Color look-up tables (CLUTs) are frequently used to embedpre-computed transformations between a colorimetric space (e.g.CIELAB) and a device space (e.g. CMYK). The sampling methodused to populate a CLUT has a significant impact on its accuracyand its error distribution. This paper discusses sampling methodsof CLUTs which convert CIELAB space to device space. Based onthe discussion, a new sampling method to achieve betterperceptual uniformity of sampling between grid points isproposed. The method uses CIEDE2000 color difference equationto sample the grid points along a* and b* dimensions in a waythat the distance between the grid points along these dimensions ismore perceptually equal. Using such a strategy improves theinterpolation accuracy of neutral colors while keeping the CLUT size unchanged.
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