Macbeth 24 patch colour chart, Sun at 45 degrees, ASI224MC with ccm applied

A test shot of a Gretag Macbeth colour chart captured outdoors in mostly blue skies, Sun at around 45 degrees elevation (which I had read elsewhere approximated to D50 conditions but this was an error). Camera used was a ZWO ASI224MC with the fisheye lens and ZWO IR-cut filter in place, shutter speed 0.16 ms, gain 0, Wred = 62, Wblue = 99, max histogram 92%.

5000/10000 frames stacked in AS!3, colour correction matrix calculated using Coca and applied to image in Gimp, shown as 16 bpp png file.

2020 03 26 0332 5 L Test surface AS P50 L6 ap242 Ps convert rotated Gimpconverted.png