Milton Taylor wrote:
If you were doing serious B&W printing as well as color I was thinking it might have been important to have all the greys and near greys well represented, since the eye seems to be quite good at picking slight colour casts in grey scales, but then the Epson printers for example have B&W printing modes anyway.
That's why there are options to create your own mix of test patches. The measure used in any algorithm that takes notice of the perceptual spacing of the test patches does so in a space that is a version of L*a*b* that has been adjusted somewhat like Delta E CIE94, in emphasizing the neutral axis.
Graeme Gill.
