I dare you to find a nastier chroma problem than this.. [Archive]

View Full Version : I dare you to find a nastier chroma problem than this..

Defiler

12th September 2002, 22:51

This one is ridiculously bad.
Here's an example:
http://hellninjacommando.com/misc/avisynth/alias.jpg

I've tried various things.. CNR2 with aggressive settings, WNR, Anti-Blink (though it's not really designed for this sort of business.).. This sort of color bleeding persists throughout the episode. Any ideas as to which filters I should try here?
I've tried comparing various filters to the original source with Subtract(), and most of them aren't really adjusting the right areas.
I'm almost ready to greyscale the whole episode and be done with it. Heh.
On the off chance that someone has some spare time to spend on this, I'll link a 20-frame sample in Huffy. The only processing done on the original was GreedyHMA(all zeroes). Approximately 3.5MB:
Alias.avi (http://hellninjacommando.com/misc/avisynth/alias.avi)

Thank you for your attention.

ErMaC

13th September 2002, 01:28

Have you tried Warpsharp? I have no idea if it would work but the bleeding of colors around the edges might be fixed by the warping mechanism.

Belgabor

13th September 2002, 01:57

You can fix the small red and green bleeding (which actually seems to be a shift of the chroma channels) by flaXens VHS filter in vdub. The blue halo is a diffrent problem (for which i have no solution atm).

Cheers
Belgabor

Defiler

13th September 2002, 02:25

Ooh! fxVHS.. Good idea.
Time to see how slow it can go. Heh.

Belgabor

13th September 2002, 02:44

lol. shouldnt be too hard to code just the chroma channel shift funtionality into a avisynth filter. siwalters already did it for a total chroma shift 2 pixels right. On the other hand fxVHS shouldnt be too slow if you just use the chroma shift functionality.

Cheers
Belgabor

Defiler

13th September 2002, 04:16

In this clip, it seems like green colors are shifted in one direction, and red in another.. fxVHS only wants to shift /all/ the chroma in one direction.. I might need something more flexible..

Belgabor

13th September 2002, 10:45

No, thats wrong. i corrected your clip by -2 and checking the first checkbox (shifts magenta left) and another instance with +2 and the second checkbox (shifts green right)

Cheers
Belgabor

13th September 2002, 13:24

I'll see about making ChromaShift a bit more functional so people can shift any or both of the U or V values about by a configurable number of pixels.

regards
Simon