Deoldify Vapoursynth filter

[Dan64]

The first sample is worse than the original, while the second is better.

I had the same problem adjusting gamma, on bright images a gamma above > 2 improves the quality but on dark scenes like your first sample the quality is worse.
That's the reason why I introduced the possibility to lower the value of gamma with the luma.
In this way I can have a gamma above 2 on bright images and a gamma below 1 on dark images.

Also the contrast can impact the ddcolor output. A contrast < 1 ddcolor images are less saturated, while a contrast > 1 the images are more saturated.

I applied a small update on the filter. I will provide a new wheel later.

Thanks,
Dan