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"Pyramid" SW LD may have a pink filter...

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"A picture is worth a thousand words"...

As you can see, the first frame is normal. After few frames, the image is pinkish, like someone put a pink filter on it... during the whole movie, the picture shifts from normal scenes to pinkish scenes and back for many times...

I'd like to use some scenes for my project, but I don't know how to restore proper colors... I tested the avisynth filter Colourlike; the results are good but not perfect.

Is there someone who could use the overlay function of avisynth (or another method) to "de-filter" the pinkish scenes? I mean, take the former picture (PNG not compressed), split the two frames, overlay the two frames (taking the right part of the picture as reference), find the color difference, and use the results as a "negative filter" to defilter the pink-shifted scenes...

Sadly my projects are lost due to an HDD crash… 😦 | [Fundamental Collection] thread | blog.spoRv.com | fan preservation forum: fanres.com

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 (Edited)

_,,,^..^,,,_ said:

As you can see, the first frame is normal. After few frames, the image is pinkish, like someone put a pink filter on it... during the whole movie, the picture shifts from normal scenes to pinkish scenes and back for many times...

This might be a very tedious fix if each shot is fluctuating across it's frames. The only semi-automated fix for such a case that I can think of is over at g-force's New colormatching script thread:
http://originaltrilogy.com/forum/topic.cfm/New-colormatching-script/topic/15002/
It would mean finding a "reference frame" in each shot and applying it across the rest of the frames of that shot, for all the shots that need it.

For your above example, it is clear to see that the Blue channel is overly bright -- which results in the shadows going blue and the highlights moving towards pink (R+B where G is weakest). So, reducing the Blue channel brightness (dropping the max=255 to max=200) gets it really close to your reference shot. See the reference-frame Blue graph and the pink-frame Blue graph -- the pink frame's adjusted Blue (overlayed in red) now matches (roughly) the reference Blue:

 

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If the image isn't warped differently than the THX version you used for your other project, you can use the chroma (colors) from the THX version and merge with this capture.

I think this is the script to use:

MergeChroma(clip1,clip2)

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You_Too,

I just thought about this option, but the "pyramid" set has no fixed aspect ratio, and it has few lines of resolution top and bottom, and less left and right... to match those two edition, first every scene has to be checked, then the "pyramid" should be cropped top and bottom (loosing few horizontal lines of resolution) and the THX laserdiscs captures should be cropped left and right (losing some vertical lines of resolution)... at this point, the picture is the smallest possible!

I tried some solutions on VirtualDub - as Spaced Ranger suggested - and found some setting are good, but still not perfect... I must find some time for more testing. If these (of more) settings could be right for the whole movie(s), then it can be possible to apply them only to pinkish scenes, and use the needed ones to replace the clipped-white/crusched-black ones.

It came also to my mind the idea of making a "pyramid" ruLes project... why not?

Sadly my projects are lost due to an HDD crash… 😦 | [Fundamental Collection] thread | blog.spoRv.com | fan preservation forum: fanres.com

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Which is the Pyramid LD?

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Ah, I have that one!

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