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Post #576584

Author
snicker
Parent topic
Info: Digging up those blacks - using the STAR WARS Blu-ray for preservations
Link to post in topic
https://originaltrilogy.com/post/id/576584/action/topic#576584
Date created
5-May-2012, 6:21 AM

TServo2049 said:

That frame, and the one of Leia peeking behind the corner, really make the red clipping obvious. In the 3PO/lobster-man frame, look at the reflection on 3PO's left leg. Even in the improved version, it's still an oversaturated blob that doesn't mesh with the rest of the image at all. You can see several other oversaturated red points among the wall lights, the reflections on 3PO, etc. There's blooming and pixellation around the edges - it look nasty even when the rest of the image is improved.

I'm absolutely not faulting you, Y_T - the red information in the transfer is just that screwed up.

Hey snicker, have you done any more work on your project to fix the clipped reds?

I've almost achieved a workflow I'm happy with. Had a massive tax problem to sort out (which I now have) so I can go back to this. To answer your question, yes, I have fixed the problem with the red channel clipping. Single channel clipping is not a major problem because there are two good channels to pull detail from. I know it's way past when I said I would have something ready but I really (no, really) hope to have a thread dedicated to all these colour problems up soon. I've also discovered through hue mapping that the Blu-ray transfer reproduces only 1/2 to 2/3 of all possible hues at any time. This range is usually cyan/blue (hue 210) to red/yellow (hue 30) and right in the middle of that range is magenta (hue 300) contaminating roughly half of the total hue range. If you scrub through the transfer in a video editor it's very rare to find green clipping but the instances of red and blue (magenta) clipping and colour shifts are numerous.