Incorrect matrix in utilities.ctl about aces-dev HOT 5 CLOSED

I don't see CONERESPMATBRADFORD in transforms/ctl/utilities/utilities.ctl. Am I looking in the wrong spot?

from aces-dev.

The CONERESPMATBRADFORD variable only exists in utilities.ctl on the dev branch, so it doesn't affect anyone right now. The incorrect matrix was brought to my attention and was logged because it should be fixed if it eventually gets rolled into the master branch. For now, though, it does not affect anyone.

I've updated the original issue with a note describing that the erroneous matrix exists only in the dev branch.

from aces-dev.

Ok, thanks.

I'm using Bradford in chromatic_adaptation.rb and I was wondering why our matrix order is different. Is that a CTL-specific thing? Is it a Ruby-specific thing?

With the matrix order quoted below the tool will reproduce the results on Bruce Lindbloom's chromatic adaptation page.

M_A_Bradford = Matrix[
  [0.8951000, 0.2664000, -0.1614000],
  [-0.7502000, 1.7135000, 0.0367000],
  [0.0389000, -0.0685000, 1.0296000]
]

from aces-dev.

It's a CTL specific thing. In CTL, the matrix ordering is transposed from the "normal" way matrices are usually written in math textbooks (and Bruce Lindbloom's website). You'll see that the matrix I list in CTL and your Ruby matrix are transposes of each other.

from aces-dev.

This matrix was corrected in 339318f and is now correct in the master branch.

Closing the issue.

from aces-dev.