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Color matching and prediction: color correction tool v1.3 released! — Page 5

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This method is looking great considering it gets its colours from only a few frames, i am liking the Mike Verta frame especially :)

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Wow DrDre, these remind me of  a movie I saw once as a kid. I think it was called "Star Wars".

-G

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The fuchsia to red on the X-wing shot got a bit blocky, although everything else in that shot looks great. I bet the reference frame you are using just doesn't have enough magenta in it for a good mapping. I wonder what would happen if you used Mike's version of that frame as the reference.

-G

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g-force said:

The fuchsia to red on the X-wing shot got a bit blocky, although everything else in that shot looks great. I bet the reference frame you are using just doesn't have enough magenta in it for a good mapping. I wonder what would happen if you used Mike's version of that frame as the reference.

-G

 I think it is in the source.  Watch this video and Mike talks about it: https://vimeo.com/124147988

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NeverarGreat said:

These look wonderful, though still a bit on the green side.

  I agree and disagree.  :-)  Each shot has a different tint to it. Sometimes it is yellow.  I think that is the nature of how it was originally and the set it was on. 

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g-force said:

Wow DrDre, these remind me of  a movie I saw once as a kid. I think it was called "Star Wars".

-G

 Totally agree.  In my opinion, "It's a print!"

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thorr said:

NeverarGreat said:

These look wonderful, though still a bit on the green side.

  I agree and disagree.  :-)  Each shot has a different tint to it. Sometimes it is yellow.  I think that is the nature of how it was originally and the set it was on. 

 The later IB prints have an incorrect green cast to them.

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I haven't followed the thread, but in principle faded colors are not an issue, if the scan has enough color depth. You would need some color references, preferably as many as possible, for the best results. The reference can have a SD resolution. 

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Easily my favorite three you have posted. Very natural looking and not blown out or anything. 

And that first shot is tricky. Not sure if it's due to the actor's makeup or what, but the skin tones look bizarre in almost every version.

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It's also amazing how screwed up R2's blue panels look in the bluray. In that last frame Han's pants are also far more blue, than they were originally. Here's a prime example of how screwed up R2's colors are in the bluray. In this frame he simply looks awful in the bluray:

http://screenshotcomparison.com/comparison/140906

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Yeah, when I was color adjusting the blu-ray, I noticed that the saturation in every shot with R2 was horrible (especially in the desert). The shots without him in between are a little less crazy. Super inconsistent. Same with laser blasts on the Tantive. Guess they just wanted certain colors to pop, despite giving all the characters sun burns in the process.

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The model I use automatically adjusts the saturation, tint, contrast, and brightness by estimating how the three color channels in multiple color spaces have shifted. If the original frame has a lot of contrast, it can become darker, and if it has a lot of highlights, it can become brighter. 

One thing I noticed is, how much depth is added to the frames. The bluray colors are really flat. 

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Once you have video output working, I would be strangely interested in seeing some of the ridiculous SE moments in 35mm-ified color. Plastic Jabba, blurry dinosaurs, hilarious robots, 'hey guys, it's me, Boba Fett!', etc.

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Here's a set of color corrections at 1080p. Some are pretty awesome, if I say so myself ;-):

http://screenshotcomparison.com/comparison/141230

http://screenshotcomparison.com/comparison/141233

http://screenshotcomparison.com/comparison/141235

http://screenshotcomparison.com/comparison/141236

http://screenshotcomparison.com/comparison/141260

http://screenshotcomparison.com/comparison/141261

http://screenshotcomparison.com/comparison/141262

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I finally managed to extend the rotations method to be able to predict different frames. Most of the color corrections shown are based on a very similar reference. However, I believed that it should be possible to use the color correction model calibrated on one frame, to predict the color correction for frames in the same scene, as these have usually been altered in a similar way or have faded in a similar way. I tested my method on the bluray/digital download, and this is what I get.

First I calibrated the model on a 720p frame:

http://screenshotcomparison.com/comparison/140900

Then I predicted the correction for this 720p frame:

http://screenshotcomparison.com/comparison/140782

The results of the prediction are:

http://screenshotcomparison.com/comparison/141323

The prediction is a bit brighter, but it is very close.

Next I calibrated the model on another 720p frame:

http://screenshotcomparison.com/comparison/140902

Then I predicted the correction for this 1080p frame:

http://screenshotcomparison.com/comparison/141262

The results of the prediction are:

http://screenshotcomparison.com/comparison/141324

The prediction is a bit darker, but it is again very close.

So, to summarize, here are the color corrections, based on a color correction model calibrated on a different frame:

http://screenshotcomparison.com/comparison/141325

http://screenshotcomparison.com/comparison/141326

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thorr said:

NeverarGreat said:

These look wonderful, though still a bit on the green side.

  I agree and disagree.  :-)  Each shot has a different tint to it. Sometimes it is yellow.  I think that is the nature of how it was originally and the set it was on. 

I know that some prints have had color shifts in different shots. For example, from what bits I've seen of them, the IB prints have noticeable color shifts in the Greedo scene - every time it cuts back and forth between Han and Greedo, the colors seem to be different. And Team Negative1's color-corrected version of their faded Kodak copy of the scene (which was spliced into their LPP) has similar shot-to-shot color shifts.

Yet I've also seen versions (late-70s VHS bootlegs, the Derann Super 8 print) where this color shifting doesn't occur, and the color seems more consistent throughout the shot.

So there were color differences between certain runs if prints, and probably between individual prints. The Moth3r bootleg has one shot of Red Leader go totally orange for no apparent reason, something I have never seen in any other copy of the film ever. And I remember mverta/Harmy saying that on at least one of the IBs, some shots in the lightsaber duel have a cold blue tint, and when I checked other sources like the Senator photos and the aforementioned bootlegs, those shots had a different color balance, closer to the other shots in the scene. (poita, do you know anything about this last one?)

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DrDre said:

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. 

I noticed that in the reel 1 preview, when I tried making adjustments in Ffdshow. I wasn't sure if it was supposed to be that way, or if it was a result of the frames closest to the outside of the reel fading at a faster rate.

It definitely did seem like one scene, the set would look more green, then more blue in the next, and then back to green. I know I read about that somewhere before, but I didn't think it would be so overly noticeable. I'm sure someone with a master's touch could make it much more subtle.

I forgot about the Super 8 print. I was waiting for the re-scan to come out, but I suppose in the mean-time I should probably download the first scan before all the seeds die.

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