...ooops... done!

Here you are some new screenshots; top image is HDTV, second DVD, third ColourMatch (not tuned), bottom BD luma and BD ColourMatch'ed to DVD chroma (click for large version):

The fact is, when the sources have any clipping whites, the filter works flawlessly; I'm testing it with Halloween, and, even if it's not 100% color accurate, it *seems* that there is no artifacts. Obviously, if the clipping whites are present, you'll find something like the last image...

The HDTV cropping shifts wildly from scene to scene, so it's not possible to do a crop-it-all; it should be cropped scene by scene...