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dragon_warrior
11th January 2012, 16:20
Suppose we have 2 clips. One (clip1) is 30i footage IVTC'd to 24p, yet it suffers from severe rainbows and dotcrawls. The other (clip2) is free from the nasty dotcrawls and rainbows artifacts and has more details with correct luma, but it exhibits high amount of false positives due to improper method of deinterlacing. My question is: How can we make the most use of these 2 clips? For example, is it possible to replace the chroma from clip1 with that of clip2 to reduce the artifacts?
All feedback is appreciated. Thanks!
ajk
11th January 2012, 17:09
Yep, though obviously the edits would have to be frame-by-frame the same, otherwise you'll get the wrong chroma in some frames. If one is IVTC'd and the other one de-interlaced, chances are they may not match very well.

http://avisynth.org/mediawiki/Merge
dragon_warrior
11th January 2012, 17:42
Yep, though obviously the edits would have to be frame-by-frame the same, otherwise you'll get the wrong chroma in some frames. If one is IVTC'd and the other one de-interlaced, chances are they may not match very well.

http://avisynth.org/mediawiki/Merge

Thanks for the suggestion. Actually I can get a rainbow-free clip with MergeChroma. Have tried using MergeLuma also, and I can tell it does a good job 'removing' the dotcrawls, but it also merges the false positives caused by improper deinterlacing.
dragon_warrior
12th January 2012, 15:24
Ok, here are a few shots that demonstrate my problem (click on the thumbnails to view full-sized images)
http://thumbnails66.imagebam.com/16935/049b55169345471.jpg (http://www.imagebam.com/image/049b55169345471) http://thumbnails47.imagebam.com/16935/75c865169345512.jpg (http://www.imagebam.com/image/75c865169345512)
This is my first try using mergechroma
http://thumbnails54.imagebam.com/16935/78a79f169345539.jpg (http://www.imagebam.com/image/78a79f169345539)

What can I do more to enhance the image?
Bloax
12th January 2012, 16:51
A slight Deblock()?

Probably just the still shot confusing dotcrawl for blocking, but maybe not.
jmac698
14th January 2012, 13:17
What you need is a kind of relative IVTC, actually just the best frame matching between the two clips. I think it's possible but someone would have to write a script for you. You could make adjustments by hand, maybe the control file that can be used in TIVTC.
http://avisynth.org/mediawiki/TIVTC