Rikk Wolf said:
… thanks to ZFARNSWORTH, I was able to digitally capture both the UK and Japanese laserdiscs.
… is public domain so I’m hosting the captures …
I’m stuck in download-hell so I can only get the 1st 8 minutes (JP version) before I must shut down (and there’s no resume to pick-up again later). But that is enough to see there are problems (on and off interlacing of parts of the picture, odd pixels-flicker here and there) as if the capture wasn’t keeping up with the source (and/or problems with the laserdisc player). These should be addressed before considering doing work on them.
I just finished getting almost 8 minutes of the UK version. It looks less rough and has better distributed color. For a quick proof-of-concept in a paint program, I made color corrections on a frame of the two version by eye, just trying to get it looking normal. The JP will need more careful reworking to squeeze out the proper color:
Slipstream UK laserdisc original |
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Slipstream UK laserdisc color correction |
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Slipstream JP laserdisc original |
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Slipstream JP laserdisc color correction |
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Even though there isn’t much crushed or blown areas in either capture . .
UK: original . . . . . . . . . . . . . . . . . . . . . . crushed highlighted . . . . . . . . . . . . . blown highlighted

JP: original . . . . . . . . . . . . . . . . . . . . . . crushed highlighted . . . . . . . . . . . . . blown highlighted

. . the JP blue channel's contrast has been messed up (the reason for it’s “orange tint”):
JP – orig / Red / Green / Blue . . . . . . UK – orig / Red / Green / Blue |
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Once that channel is fixed, the colors of the two versions can be made the same for a seamless overlap (but not easy one – UK needed a tiny rotate to better line up with JP, and there may be some warp with which to contend) of the two sources for covering, or mostly covering, the burned-in JP subtitles. For now, I get this:

Referring to dvdmike's excellent trailer would be a big help for true color matching.