Thanks DrDre, g-force and thorr.
Here are Harmy and Blu Ray matched to GOUT colors:
http://screenshotcomparison.com/comparison/138661
http://screenshotcomparison.com/comparison/138662
As you can see, the PDF algorithm doesn't really work well with bad target images. The colors are matched, but there are problems with the sky and the resulting images are way to grainy.
To reduce the grain artefacts, I implemented the grain removal algorithm described in the paper that also came up with the PDF-algorithm.
The idea is to match the gradient of the result picture with the gradient of the input picture without losing the colors of the target image. This should reduce the noise introduced by a bad target picture.
Here are the matched GOUT colors compared to the degrain algorithm:
http://screenshotcomparison.com/comparison/138663
http://screenshotcomparison.com/comparison/138664
Here are the final pictures compared to the GOUT: