Color matching and prediction: color correction tool v1.3 released! — Page 17

FrankT said:

Is it able to remove the blue tint of Hoth from the DVDs?

 In principle it is meant for correcting old prints, not new color gradings, but it does neutralize the colors if you apply it to a single frame. Normally you would first calibrate the the model on a number of frames of the reel of a faded print. However, here's what it does with Semi-Specialised 2.2:

Thanks for reposting 1.2 DrDre.  It's really awesome and fun to use!

Back to my previous question with Bruce Willis and using a different frame that doesn't line up properly, how did you use multiple different parts of the frame to build the color correction model?  With the tool, I could grab a small piece of skin or something white, etc. but I am not sure if that is the right approach.  Thanks!

thorr said:

Thanks for reposting 1.2 DrDre.  It's really awesome and fun to use!

Back to my previous question with Bruce Willis and using a different frame that doesn't line up properly, how did you use multiple different parts of the frame to build the color correction model?  With the tool, I could grab a small piece of skin or something white, etc. but I am not sure if that is the right approach.  Thanks!

 You can grab parts of the frame that are very similar, but it won't work if the part is too small or doesn't have enough color information. In principle the method needs to identical frames, with some flexibility, but not too much.

Thanks for the help.  If you grab a portion that has greens, blues and whites in it, and also in the reference do the same thing, but the greens, blues and whites are in different pixel positions, will it still work, or do they need to be aligned and it would be totally screwed up?

As long as you have enough pixels, and the reds, blues, and greens have to same proportions relative to each other, it should work oke. 

I've further improved the parameter free color correction, for correcting color shifted prints. Here are some results for Team Negative1's reel 1 preview:

and some preliminary results for the frames piota posted for TESB. Since these are based on only two frames, the predictions are expected to be less accurate.

So, how do these color corrections compare to the bluray matched to the Tech IB print colors?

Tech IB:

Team Negative1 LPP automated color correction:

Tech IB:

Team Negative1 LPP automated color correction:

The predicted colors are a close match to the Tech IB colors, which includes the slight green shift in the second frame. This seems like too much of a coincidence, so it appears the green shift was also present originally in other prints of Star Wars, and is probably part of the original color grading of the film.

Here are a few more comparisons between the automated color correction, and the bluray matched to the Tech IB print:

Team Negative1 LPP scan:

Tech IB:

Team Negative1 LPP automated color correction:

Team Negative1 LPP scan:

Tech IB:

Team Negative1 LPP automated color correction:

Team Negative1 LPP scan:

Tech IB:

Team Negative1 LPP automated color correction:

Team Negative1 LPP scan:

Tech IB:

Team Negative1 LPP automated color correction:

Considering how close these predictions are to the Tech IB colors, while not having been matched to the Tech IB, my conclusion is that the original LPP colors were very close to the Tech IB colors. Consequently, I can only conclude that the Tech IB print is very representative of what people saw in the theatre in 1977. 

So, unless the agreement is a huge coincidence, which I think is higly unlikely, I think this is the first solid evidence of what the actual colors were of Star Wars back in 1977, when it was first released. 

Noooooooooooooooo! the dreaded tinypic images. Edit it was fixed XD

Tech IB = Beautiful

Can someone remind me what the suspected origin of the LPP is?

Bootleg of the film made in the early-mid 80's based on a Kodak print that had only begun to fade? 

Here's a comparison to a frame posted by piota a while ago of one of his scans:

Team Negative1 LPP scan:

Poita scan:

Team Negative1 LPP automated color correction:

This automated method looks interesting, I love the colours.

Could it be used for fixing faded 8mm film, e.g. something like this ?

pittrek said:

This automated method looks interesting, I love the colours.

Could it be used for fixing faded 8mm film, e.g. something like this ?

Image removed

 In principle yes, but it depends somewhat on, whether the film meets the underlying assumptions of the color correction model. One of those assumptions is that over the run of a reel/film the fading is similar across frames, and another is that over the run of a reel/film, each of the colors magenta, yellow, and cyan, are equally probable to occur. Consequently, the model needs enough shifted frames, to predict an accurate correction.

Impressive.

-G

g-force said:

Impressive.

-G

 I'm impressed by your edit as well as Dre's corrections. :)

towne32 said:

g-force said:

Impressive.

-G

 I'm impressed by your edit as well as Dre's corrections. :)

 ;)

-G

Hello,

I would want to really thank you for this great software  you made here, it will help me a lot in my future projects.

As I presume, I could use it to color correct deleted scenes to match the movie from other source, is that right (the color prediction correction)?

I would need to extract whole movie into .jpg and color correct them frame-by-frame using this, yes? For best results I propably should use new color correction model for each scene?

I tried it quickly with this movie I have been wanting to color correct and work on for a very long time now, but considering the colors it was really tough work for me. Your tool will really help me a lot :)

Source (horrible red tint)

HDTV Broadcast (IMO best colors of this movie out there, better than DVDs)

Color corrected

As you can see it producted a lot of artifacts on that spot there. What should I do about it? Try to match both frames even more to each other?

Thank you very much again :)

Colek said:

Hello,

I would want to really thank you for this great software  you made here, it will help me a lot in my future projects.

As I presume, I could use it to color correct deleted scenes to match the movie from other source, is that right (the color prediction correction)?

I would need to extract whole movie into .jpg and color correct them frame-by-frame using this, yes? For best results I propably should use new color correction model for each scene?

I tried it quickly with this movie I have been wanting to color correct and work on for a very long time now, but considering the colors it was really tough work for me. Your tool will really help me a lot :)

Source (horrible red tint)

image removed

HDTV Broadcast (IMO best colors of this movie out there, better than DVDs)

image removed

Color corrected

image removed

As you can see it producted a lot of artifacts on that spot there. What should I do about it? Try to match both frames even more to each other?

Thank you very much again :)

 The best thing to do, is to do the color correction shot by shot, although sometimes it works very well for multiple scenes or even a whole movie if the differences in color are very consistent.

The artifacts seem to be caused by some compression artifacts in the source. Increasing the stabilization parameter might reduce these, so try a value of a 1000, and then reduce the parameter if possible. 

DrDre said:

Colek said:

Hello,

I would want to really thank you for this great software  you made here, it will help me a lot in my future projects.

As I presume, I could use it to color correct deleted scenes to match the movie from other source, is that right (the color prediction correction)?

I would need to extract whole movie into .jpg and color correct them frame-by-frame using this, yes? For best results I propably should use new color correction model for each scene?

I tried it quickly with this movie I have been wanting to color correct and work on for a very long time now, but considering the colors it was really tough work for me. Your tool will really help me a lot :)

Source (horrible red tint)

image removed

HDTV Broadcast (IMO best colors of this movie out there, better than DVDs)

image removed

Color corrected

image removed

As you can see it producted a lot of artifacts on that spot there. What should I do about it? Try to match both frames even more to each other?

Thank you very much again :)

 The best thing to do, is to do the color correction shot by shot, although sometimes it works very well for multiple scenes or even a whole movie if the differences in color are very consistent.

The artifacts seem to be caused by some compression artifacts in the source. Increasing the stabilization parameter might reduce these, so try a value of a 1000, and then reduce the parameter if possible. 

 Thanks for your reply, I will try to set stabilization parameter to 1000 when I am at my workstation PC :)

You think I should firstly go with all the filters for the movie (denoisers, Super Resolution etc. using AviSynth for that) or color correction first?