DrDre

Here's what I believe to be the more correct adjustment to Mike's frame:

http://screenshotcomparison.com/comparison/138976

Here's the bluray calibrated to this frame:

http://screenshotcomparison.com/comparison/138977

Here's the other three bluray frames from the Tantive IV scene, adjusted with this color adjustment model:

http://screenshotcomparison.com/comparison/138978

http://screenshotcomparison.com/comparison/138979

http://screenshotcomparison.com/comparison/138980

I'm just happy that with each release of the SE the amazon.com ratings keep dropping, and people are getting more angry in their reviews. 

Yeah, there definitely is a reddish, pink tone in some of the screenshots. I will redo them tomorrow with only a slight adjustment.

Some of the bluray colors are really odd, in the early part of the Tantive IV scenes there is a green tone, then later there is a blue tone. The colors are really all over the place.  

With regards to adjusting Mike Verta's preliminary color grading (it says so on his website), I let myself be guided by the stormtrooper's hands and weapon, which are really green in Mike's screenshot, and should be gray, but I may have overdone it a bit with the reds.

Let's not forget all the color adjusments are based on that single low-res frame, that doesn't have much color in the first place. 

Although the bluray is not known for it's consistent color timing, the following examples show that the color adjustment model based on the adjusted Legacy frame works pretty well for many other scenes:

http://screenshotcomparison.com/comparison/138907

http://screenshotcomparison.com/comparison/138908

http://screenshotcomparison.com/comparison/138909

http://screenshotcomparison.com/comparison/138910

http://screenshotcomparison.com/comparison/138911

http://screenshotcomparison.com/comparison/138912

http://screenshotcomparison.com/comparison/138913

That could indeed have been true. The print coloring probably depended on the type of print stock that was used. The question of course is, whether the green shift was deliberate, or whether age causes the print to become slightly green shifted, and whether the original negative also had this green shift? 

If we compare this color correction to Harmy's Despecialized Edition, Harmy's seems pretty green shifted by comparison. Also the red and green highlights in the background and on Vader's belt are much more dull in Harmy's version:

http://screenshotcomparison.com/comparison/138902

The photos of the Technicolor IB print, although not an absolute color reference, seem to suggest the reds are much more highlighted in the Senator print as well:

http://screenshotcomparison.com/comparison/138903

I did some further tests using a screenshot posted by Mike Verta as a basis. That screenshot was somewhat green shifted, so I first corrected that:

http://screenshotcomparison.com/comparison/138895

I calibrated the color adjustment model on this frame.

Reference versus corrected:

http://screenshotcomparison.com/comparison/138896

Before versus after:

http://screenshotcomparison.com/comparison/138897

Then I used the color correction model to correct three other Tantive IV frames:

http://screenshotcomparison.com/comparison/138898

http://screenshotcomparison.com/comparison/138899

http://screenshotcomparison.com/comparison/138900

Here's what you get for LOTR with my methodology:

http://screenshotcomparison.com/comparison/138893

Seems to be a very good match.

That looks really good! How much time did it take to make that clip?

Well, after reviewing a video sample of SRV13 I've come to the conclusion that the slow moving grain can be reduced somewhat, but at the expense of detail and clarity, as was clear from the screenshots. All in all, I think the grain is just something we're going to have to live with. It's part of the source, and gets enhanced with everything else. I will continue rendering SRV12.

The color adjustment is slightly green shifted, like the frame it is based upon. I will do a test next week, where I will adjust SRV13, using Mike Verta's frame as a reference.

I hope I will be able to make a small tool for color matching one or multiple frames next week, that everybody can use. Should be relatively straightforward.

The match is indeed pretty good, but grain, crushed blacks, and whites, are an issue for these types of algoritms. I think it could in principle be solved, by adjusting some of steep gradients in the color prediction.

The color prediction I did for Leia frame based on a 35 mm frame, is surprisingly close to a similar frame of Star Wars Legacy Edtion, that Mike Verta posted on his website.

http://screenshotcomparison.com/comparison/138669

I must admit, I really like these more saturated colors. They look really film like.

Actually the color prediction for the second frame is surprisingly close to a similar frame of Star Wars Legacy Edtion, that Mike Verta posted on his website.

http://screenshotcomparison.com/comparison/138669

I must admit, I really like these more saturated colors. They look really film like.

Thanks G!

I've been working on a color matching/transfer algorithm. I ran some tests using a scan of a frame of a print, that seems to have retained it's color, and I was surprised how different the colors look compared to Harmy's great work:

Reference frame:

http://www.thestarwarstrilogy.com/image.axd?picture=/2015/06/35mm-Frame-8228.png

After adjusting the brightness slightly, this was the result of the color predictions for two other frames:

http://screenshotcomparison.com/comparison/138626

http://screenshotcomparison.com/comparison/138627

Great match once more! 

For the GOUT the processing is quite fast, because colors are pretty consistent for the entire movie. So after a color model has been built, it only takes a few seconds per frame. However, since I'm doing it in MATLAB, I have to convert the raw avi to image files, and then import in MATLAB, adjust colors and then export. Subsequently the loose images will be converted back to avi. 

I can but currently I can only do it on a frame by frame basis, so no videos. Also I only have the code at work, so I can't do it this weekend sadly...

If we apply the color correction model directly to the Tantive IV scenes of the bluray it actually works pretty well. The bluray color adjustments are fairly consistent, except for a odd green hue in the opening scenes of the film. 

Here are some examples of color corrections done, based solely on frame 8228 of the GOUT:

http://screenshotcomparison.com/comparison/138583

http://screenshotcomparison.com/comparison/138584

and the same, but now based on frame 8228 of the 35 mm print (brightness slightly adjusted):

http://screenshotcomparison.com/comparison/138587

http://screenshotcomparison.com/comparison/138588

I've slightly optimized my color correction script, but the PDF algorithm is still better at matching frames of the same shot.

However, the real strength of my current method is that it can color correct frames from completely different scenes. 

Again the model is calibrated on frame 8228, where -1 video sample is matched to the GOUT:

http://screenshotcomparison.com/comparison/138571

http://screenshotcomparison.com/comparison/138572

Subsequently, the color correction model is used to correct a frame, which depicts a different scene with different colors.

Before versus after:

http://screenshotcomparison.com/comparison/138573

GOUT versus independent color correction:

http://screenshotcomparison.com/comparison/138574

Great, I think I also know how to adjust my script to better match your result for the match to a reference frame, and keep the possibilty to transfer the color mapping to different frames. To be continued...

Yep, that looks pretty much exact. Would be happier if I could match yours, though. ;-)

That depends. If the colors were adjusted or have faded in the same way in different scenes it would work just fine. The Tatooine scenes in -1 preservation have a very similar blue hue to them, so I expect the color corrected version would look very similar to the reference, even if the calibration was done based on a Tantive IV frame.

If the color was adjusted on a scene by scene basis or if the reels were stored under different conditions it would most likely not work very well.