For that reason, calculating colors in Prophoto RGB is a nogo in my opinion.
What about AdobeRGB then? The a* 0/255/0 is -128 in Photoshop but -129.1 in Lightroom. If Lightroom can do it…. OK, so we’ve two problems in PS relating to this issue: 1) A need for greater precision (decimals) in the Color Picker. 2) Lab ab values are limited to +/-128 which doesn’t provide enough coverage. And Lightroom does both of these things just fine illustrating the need. If LR can do it, seems like the almighty PS should too... But back to my original question - is there an easy to use color calculator like Photoshop’s Color Picker that supports custom printer profiles and lists values (including Lab) to at least one decimal? Scott Martin www.on-sight.com onsite color science insight