What can i improve....and how

[Mounir]

I'm running out of idea and/or filter, i need your opinion:
(Source vhs ntsc)
picture 1 (smpte 170, reference) (http://img34.imageshack.us/img34/9545/76702214.png)
picture 2 (original frame) (http://img130.imageshack.us/img130/936/78490105.png)
picture 3 (my tweak..possibly definitive) (http://img97.imageshack.us/img97/1994/19564286.png)

The black level is not perfect but if you pay attention to the color histogram you can see that the colors are near perfection.
I don't know how to adjust this black level in a way that will not ruin the dark blue and purple.

[Mounir]

Anyone ?

[jmac698]

Hi,
This is one of my interests! I made a script to tell you, live, how to adjust levels to perfection, that is it calculates the adjustment brightness and contrast.
If you stay in a YUV mode, you can adjust the brightness and contrast with tweak, it won't get rid of the purple.
If I know what you mean, the purple is darker than should be visible, yet when yuv is converted to rgb, the purple will be visible.
http://code.google.com/p/avisynthrestoration/wiki/Measure

oops, looks like I didn't enclude the calibration.
I should also mention, don't clamp the YUV values to a valid range (e.g. y=16-235) until you've denoised, the noise beyond range is necessary to denoise.
Just set the brightness until recorded y=16 comes as y=16, then adjust contrast until measured y=235 becomes y=235.