Sign In

Info: Get rid of the Chroma Shift in Empire (GOUT) — Page 2

Author
Time

esb

@msycamore, here's a sample with my script, no colourspace conversion needed.

BTW did you try also shifting the blue plane the same amount and places as the red i.e. chromashift(v=2,u=2)  , the blue error isn't as obvious as the red but it's definitely noticeable.

 

Author
Time
 (Edited)

You_Too said:

Thanks. Actually, when looking at it again, it seems shifting blue by 1 was better than 2. When shifting by 2 it fixed the upper right part better, but in the rest of the picture it looks like the blues are too far to the right. Updated it in my post.

On the other hand, since that scene begins with a spinning fade from another scene without the blue shift, I guess it would need some additional scripting to make sure only this shot gets changed. Something I don't know how to do.

Yeah, looks a little better. But what you describe is what I remember happened when I tried it, it gets noticeable on the starfield that the blue gets misaligned once you apply the correction. Also, what you said, the wipe complicate matters, maybe better to just leave it alone.

Or not, damn I need to learn to type faster. ;) I actually don't remember if I tried that, Red5. Both examples are improvements alright.

We want you to be aware that we have no plans—now or in the future—to restore the earlier versions. 

Sincerely, Lynne Hale publicity@lucasfilm.com

Author
Time

Red5 said:

BTW did you try also shifting the blue plane the same amount and places as the red i.e. chromashift(v=2,u=2)  , the blue error isn't as obvious as the red but it's definitely noticeable.

 

Wait a minute, are you talking about my main chromashift-fix (if so, then the answer is no) or are you talking about this particular shot?

We want you to be aware that we have no plans—now or in the future—to restore the earlier versions. 

Sincerely, Lynne Hale publicity@lucasfilm.com

Author
Time

^ I should have been clearer, I was talking about your main chromashift-fix.

Look at the three blue lights bottom left, top sample has chromashift(V=2), bottom sample has chromashift(V=2,U=2)

esb

Author
Time

Red5, you're right! ChromaShift(V=2) doesn't shift all chroma, but adding U=2 makes sure it does. Or changing it to ChromaShift(C=2).

Updated my earlier post with the script. (I had missed one part too that I added)

Author
Time
 (Edited)

Ah, nice catch Red5! didn't notice that. You can actually see the blue shift on some of my screenshots on the first page as well. Thanks for pointing it out!

Great, will update the first post with your scripting You_Too. Thanks!

Before I update the first post, are we sure this blue shift is present on all those parts in the transfer?

We want you to be aware that we have no plans—now or in the future—to restore the earlier versions. 

Sincerely, Lynne Hale publicity@lucasfilm.com

Author
Time

Also, another sequence that may need some correction is the first establishing shot of the rebel fleet at the end of the film, if you guys check it out, there's red seen around the edges at the top of the medical frigate that looks suspicious.

We want you to be aware that we have no plans—now or in the future—to restore the earlier versions. 

Sincerely, Lynne Hale publicity@lucasfilm.com

Author
Time
 (Edited)

msycamore said:

Great, will update the first post with your scripting You_Too. Thanks!

Before I update the first post, are we sure this blue shift is present on all those parts in the transfer?

No problem! :)

It would take a lot of analyzing to be 100% sure, but after checking some of the scenes it does look like all the chroma was shifted in all of them, so C=2 fixes what V=2 did not.

Check for example the blue lights in the Falcon cockpit, they look correct now. I also checked the "I am your father" part, and most of the blue looks more correct there.

It seems though, that in some scenes the blue is differently shifted over the image but I guess we can't do much about that unless somebody wants to do a scene by scene correction. I sure am happy with this fix since it does fix the worst of the problems.

msycamore said:

Also, another sequence that may need some correction is the first establishing shot of the rebel fleet at the end of the film, if you guys check it out, there's red seen around the edges at the top of the medical frigate that looks suspicious.

I think that's gotta have something to do with how they made those scenes. There are shots in the Falcon cockpit where the window edges and edges of Han and Chewie's heads have a blue tint. Probably the same thing.

EDIT: Tried shifting the chroma to the left in the rebel fleet scene, and it seems I was right, because now it looked even worse. Instead there was a red edge around the left of the ships.

Author
Time

I think what you're talking about is blue spill from some of the effects work but the red I was referring to, seen on the medical frigate and some of the smaller ships in the rebel fleet sequence is something else.

We want you to be aware that we have no plans—now or in the future—to restore the earlier versions. 

Sincerely, Lynne Hale publicity@lucasfilm.com

Author
Time
 (Edited)

msycamore said:

Before I update the first post, are we sure this blue shift is present on all those parts in the transfer?

 

As You_Too already said the blue shift seems to follow the red shift close enough in most of the affected scenes.

Although I would suggest these slight changes to your frame numbers.  

(90888 - 96650) changed to:

90888 - 96324
96447 - 96650

(96325 - 96446 is then untouched)

 

And (163146 - 165249) changed to:

163146 - 165306

 

Author
Time

Thanks Red5! I'll update the script again.

Any other spots left to add or remove?

Author
Time

Nothing more from me, not right now anyway ;-)

 

Author
Time

Red5 said:

I would suggest these slight changes to your frame numbers.  

(90888 - 96650) changed to:

90888 - 96324
96447 - 96650

(96325 - 96446 is then untouched)

 

And (163146 - 165249) changed to:

163146 - 165306

 

Good eye! I updated the first post with your great observations. Thank you! :)

We want you to be aware that we have no plans—now or in the future—to restore the earlier versions. 

Sincerely, Lynne Hale publicity@lucasfilm.com

Author
Time

Red5, what are you using to view the video and take screenshots? Your viewer is not interpolating/upsampling the chroma when converting YV12 into RGB - you can tell by the blockiness at the extremities of the strong reds.

I seem to recall you get this if you load an AviSynth script which delivers YV12 into VirtualDub - you can get smoother results if you add ConvertToRGB() at the end of the script.

Guidelines for post content and general behaviour: read announcement here

Max. allowable image sizes in signatures: reminder here

Author
Time

Yeah, I noticed that, it's seen on You_Too's screenshot as well.

We want you to be aware that we have no plans—now or in the future—to restore the earlier versions. 

Sincerely, Lynne Hale publicity@lucasfilm.com

Author
Time

Moth3r said:

Red5, what are you using to view the video and take screenshots? Your viewer is not interpolating/upsampling the chroma when converting YV12 into RGB - you can tell by the blockiness at the extremities of the strong reds.

I seem to recall you get this if you load an AviSynth script which delivers YV12 into VirtualDub - you can get smoother results if you add ConvertToRGB() at the end of the script.

Yeah I see what you mean, I was using old Virtualdubmod and actually had the ConverttoRGB() at the end of my test/work script although mostly for CCE mpg encoding reasons, I didn't know this also resulted in smoother RGB conversion, but now it was bypassed by a return(last) further up the script. Thanks for the information this is good to know.

 

Author
Time

@Moth3r: Actually, the blockiness of strong reds is there in a lot of versions of the movies. Even the 2011 blu-rays. Since it's there in the source, I think it's better to post a screenshot which is directly comparable to the source to see the difference.

Author
Time
 (Edited)

Here's a smoother sample, with the script that shifts the blue more on the right side than on the left side (top sample), which is slightly better for this particular scene than the chromashift(c=2) (bottom sample), but perhaps not really worth the extra hassle.

esb

Author
Time

You_Too said:

@Moth3r: Actually, the blockiness of strong reds is there in a lot of versions of the movies. Even the 2011 blu-rays. Since it's there in the source, I think it's better to post a screenshot which is directly comparable to the source to see the difference.

No - what I'm talking about about is not an artefact in the source, it's a consequence of the source's format and how that is decoded for display.

Examples to follow...

Guidelines for post content and general behaviour: read announcement here

Max. allowable image sizes in signatures: reminder here

Author
Time

@Moth3r: Ok, I'll check your examples when you've posted them.

@Everyone else: Is there any chance any of you could go through the whole movie and check if there's any more frames that needs to be added to the script?

You see, me and DJ are going to use it for the Blu V2 and before we render the movie, (a very long process) we wanna make sure we haven't missed anything.

Before starting the work on cleaning up frames for SW, I was checking ESB frame by frame for things that needed cleanup, and that's a ton of work already so I'd be very grateful for the additional help with the chroma shift.

And are we sure there is no chroma shifting at all in the first half?

Author
Time
 (Edited)

You_Too said:

@Moth3r: Actually, the blockiness of strong reds is there in a lot of versions of the movies. Even the 2011 blu-rays. Since it's there in the source, I think it's better to post a screenshot which is directly comparable to the source to see the difference.

Not sure what blockiness of reds you describe seeing in other versions? I doubt any official video release have chroma sampling errors, but I guess you never know with Lucasfilm these days. Anyway, what Moth3r meant is the pixelated reds, easily seen on the stardestroyer's engine glows on your pic and Red 5's earlier pics in the thread. That's not in the source, you sometimes see this kind of errors on video material that has gone through some bad colorspace conversions.

Red5 said:

Here's a smoother sample, with the script that shifts the blue more on the right side than on the left side (top sample), which is slightly better for this particular scene than the chromashift(c=2) (bottom sample), but perhaps not really worth the extra hassle.

Hard to decide what looks best on that comparison but I actually lean towards your old sample, maybe I'm crazy. Both are great improvements.

This is what I described earlier.

See the red around the edges atop the frigate in the upper left corner. Am unable to check if there's a fix for this at the moment, but it's definitely a video artifact and not something special effects related.

Edit: I take that back, it could be special effects related.

We want you to be aware that we have no plans—now or in the future—to restore the earlier versions. 

Sincerely, Lynne Hale publicity@lucasfilm.com

Author
Time

msycamore, are you absolutely sure that only the scenes you point out are affected, and not the whole film? Do you have any good examples that have just as much red and blue info that show that the chroma channels line up perfectly without shifting the chroma?

Author
Time

msycamore said:

Not sure what blockiness of reds you describe seeing in other versions? I doubt any official video release have chroma sampling errors, but I guess you never know with Lucasfilm these days. Anyway, what Moth3r meant is the pixelated reds, easily seen on the stardestroyer's engine glows on your pic and Red 5's earlier pics in the thread. That's not in the source, you sometimes see this kind of errors on video material that has gone through some bad colorspace conversions.

Maybe it's media player classic's fault then. I see it in most Star Wars movies for some reason. Here's a closeup from the 2011 blu-ray, of the lasers firing between the star destroyer and Tantive:

@g-force: Here are some random screenshots from the first half of the film. I'm using my script that makes the colors a bit stronger so it's easier to see. (Using avspmod this time instead of MPC to avoid blocky reds)

Author
Time

g-force said:

msycamore, are you absolutely sure that only the scenes you point out are affected, and not the whole film? Do you have any good examples that have just as much red and blue info that show that the chroma channels line up perfectly without shifting the chroma?

Well, I actually thought I had done a meticulous job checking this but Red5 have since helped pointing out that the frames 96325 - 96446 wasn't affected and that 163146 - 165306 were, so I guess nothing is definitive as of yet. It was some time since I went through this myself but I remembered seeing those two additional issues I posted on the stardestroyer and the medical frigate and look what came up as a suggestion, an additional fix for the blue chroma information as well. I guess more people need to check things out to be sure, but I suspect Red5 already did though, as what he spotted wasn't something you normally do casually. But the whole film is definitely not affected.

We want you to be aware that we have no plans—now or in the future—to restore the earlier versions. 

Sincerely, Lynne Hale publicity@lucasfilm.com

Author
Time

You_Too said:

Maybe it's media player classic's fault then. I see it in most Star Wars movies for some reason. Here's a closeup from the 2011 blu-ray, of the lasers firing between the star destroyer and Tantive:

Weird, have to check if my media player behave in the same way. Does the same thing happen on all your video files?

We want you to be aware that we have no plans—now or in the future—to restore the earlier versions. 

Sincerely, Lynne Hale publicity@lucasfilm.com