Archives for January 2016

This is the 27th in a series of posts on color reproduction. The series starts here. The day before yesterday, I posted a series of analyses of Macbeth ColorChecker images that showed that repeatablility was very good when the lighting, the camera position, and the exposure remained constant. However, we’ve see before in this series… [Read More]

This is the 26th in a series of posts on color reproduction. The series starts here. In discussions on DPR about analyzing Macbeth chart photographs, someone whose opinion I respect raised the issue of repeatability of the results. I thought I’d start with the basics, and made a series of 16 photographs of the chart… [Read More]

This is the 25th in a series of posts on color reproduction. The series starts here. I’ve cleaned up the u’v’ plot from yesterday a bit, and have done CIELab and CIELuv chromaticity representations of the three-way camera/profile/raw developer comparisons. Here they are:     I added the color shadings to the Lab and Luv… [Read More]

This is the 24nd in a series of posts on color reproduction. The series starts here. I spent most of yesterday and today setting up for chromaticity plots with one reference and two arbitrary profiles, cameras, and/or raw developers. It doesn’t sound like that big of a deal, but it turned out to be the… [Read More]

This is the 23nd in a series of posts on color reproduction. The series starts here. Yesterday, in what some may see as an exercise prioritizing form over function, I added two chromaticity diagrams to the Matlab code, xy and u’v’. Here are some samples, for Lr Adobe Standard Profile development of a 3200K lit… [Read More]