Strange Artefact with ColorsYUV

[mushishi]

Using ColorsYUV to expand TV levels to PC levels produces a strange banding pattern in the levels of the video:

http://img87.imageshack.us/img87/6664/levelsrs7.th.jpg (http://img87.imageshack.us/my.php?image=levelsrs7.jpg)

The top is with the filter enabled and the bottom without. Is this a bug? Should I be concerned? Are there alternatives that do not produce this effect?

[scharfis_brain]

You'll ALWAYS get a banding effect, when you try manipulate image levels...

[mushishi]

I don't see the same thing when I use the levels plugin itself to manipulate the levels?

[foxyshadis]

You know that the histogram in ffdshow's levels filter only shows the input, not the output, right? If you want to see the effect, you need to chain a second instance of ffdshow after the main one, and open levels on it. Then you'll see the troughs.

Alternately, you can enable avisynth and use histogram() to visualise it.

There are such things as interpolating levels, but they're quite slow compared to a straight lut levels.