I am trying to work with the Luminance value in the True Color dialog. Here's what I am doing by hand that I wonder if perhaps it can be automated. Within the True Color dialog I enter some True Color number, say 132,154,174. The Luminance value now reads 60. Fine. I now want to get adjacent true color numbers by simply increasing or decreasing the Luminance value. I enter 57 Lum and then read and write down 122,146,168. Enter 54 and read and write down 113,139,162, etc., etc. I do this to make a list for half dozen True Color numbers. Then I use that list as input values in my little AutoLISP routine to create a sample printed color palette for visually selecting final colors for a large plot. I know of no way to address Luminance value under AutoLisp. Only True Color. Len Miller
