Desree

User Group: Members
Join date: 20-Oct-2006
Last activity: 22-May-2025
Posts: 78

Post History

Post: #253026
Topic: Info: Auto-correction from SE colours to GOUT colours (lots of information)
Link: https://originaltrilogy.com/post/id/253026/action/topic#253026
Time: 23-Oct-2006 6:10 PM

Okay, here goes. Superrune, you wanted to see the source, so here are the same main three shots in Pan And Scan (though i wasn`t able to do an exact match on the Yoda shot, `cause i can`t remember which frame i used). These are taken from the raw capture (sorry, i deleted the Huffy render used for the histogram as i needed the hard drive space and want to still use the raw capture for a `definitive` render), before remove dust was invoked but after level correction. Noise for the histogram was removed with Removedust(6). That would be the only step left.

Rogue2 Fullscreen
Yoda Fullscreen
Fleet Fullscreen

Laserman, yes i am using the latest version. But I think i can scrap that line about the wasted histogram rendering. I`d forgotten something very important regarding YV12. I am using these in my script, before the RGB conversion (i forget things and get confused easily, as i am a heavy smoker, for those that know what i mean). A Polar and regular YV12 histogram is generated off the GOUT and SE, to make sure that the YUV levels match, and then the rgb histogram from the SE and the Pan And Scan used to correct colour. In fact, this is what it looks like without the YUV correction:

Rogue2NoYV12

Not bad, but doesn`t give that nice crisp white provided with the YV12 Histo`s, and both histograms are needed otherwise the endresult isn`t affected. And for PaulisDead2221, here is the section of my script that deals with the colour correction:

polarcolourlike("D:\Empire\ESBdvdSMART\Histogram\SeDVDallPolar.txt","D:\Empire\ESBdvdSMART\Histogram\OrigDVDallPolar.txt",true,true,true)
colourlike("D:\Empire\ESBdvdSMART\Histogram\SeDVDallYV12.txt","D:\Empire\ESBdvdSMART\Histogram\OrigDVDallYV12.txt")
converttorgb32(matrix="pc.709")
colourlike("D:\Empire\ESBdvdSMART\Histogram\SeDVDallRGB.txt","D:\Empire\ESBdvdSMART\Histogram\FullLaserallRGB.txt")
levels(36,1,214,0,255)
VD_HUE(sat=0.9)

But the page that moth3r linked to really does have all the info (be aware that the last version released is on page 2 of the discussion).
Should anyone wish to use them, here is a link to all the histograms used in the above sample:

Histograms

And for those that wish to know, my project isn`t yet finished, although Empire is rapidly entering the "Alpha" phase, in fact should be done by the end of the week, and Star Wars shouldn`t be too far behind (been de-se`d, but not colour corrected). When this is done, i will start a new topic where i hope to link to the script, histograms and plugins used and provide instructions as a `do it yourself` kit for owners of the original dvd`s. The "Alpha" release will simply use a remastered GOUT to replace SE footage, but i am simultaneously recreating missing frames at a higher quality, pulling together every source i own, but so far only have Vader And the Emperor and a tiny segment of Leia in the Clouds (about 25 frames of the pod car which was replaced by the Weather Vain), completed. But it is tedious and boring work. So the final version will be a while in coming. I do not wish to derail the thread, so this is the one and only time that i will hijack it to discuss my own project in detail.
Oh, and one last thing before i finish this post, the frame that inspired the thinking behind the idea of using the YV12 histogram before the RGB ones, the purple asteroid:

That Damned Asteroid

Post: #252835
Topic: Info: Auto-correction from SE colours to GOUT colours (lots of information)
Link: https://originaltrilogy.com/post/id/252835/action/topic#252835
Time: 22-Oct-2006 2:23 PM

Surprisingly the only formating needed for the picture was the removal of black bars on each version. The pan and scan version was cleaned with removedust, and rendered as a continuous Huffy file after capture. After that the histograms were written `as is`. It should be noted, however, that great care was taken to get a capture of the Pan and Scan version with accurate colour representation, contrast and brightness. Colourlike matches the histograms between the two versions on a frame by frame basis, meaning that brightness and contrast are affected aswell as colour. Oh, and this operation was performed in rgb colour space, as experimentation showed this to give a better match than either YV12 or Polar YV12. In fact, polar YV12 seems to do nothing at all, and is a waste of an afternoon of histogram rendering. Also, once colourlike was invoked, black and white levels needed to be corrected once more (i`d like to take this opportunity to thank the X0 boys for their tutorial on this), otherwise i got a washed out look:

Washed Out Fleet

To be honest, i would`ve thought that the lost in the snow section would have benefited from readjusting the time compressed laserdisc version to match the SE more accurately, but it doesn`t. I am, however, currently making a new Pan And Scan version of the SE to write a new histogram and see if this helps, but to be honest that`s only because i have time on my hands. I`m not holding out much hope that it`ll work.

Post: #252739
Topic: Info: Auto-correction from SE colours to GOUT colours (lots of information)
Link: https://originaltrilogy.com/post/id/252739/action/topic#252739
Time: 21-Oct-2006 7:04 PM

Hi there. First i suppose i`d better introduce myself. My name`s Desree. I`m a new member to these forums, but have been reading them or years. I started doing my own laserdisc transfers back in 2000 (You know,when Lucas said we wouldn`t see any Star Wars DVD`s until 2006), and found these boards to be an invaluable mine of info. Even though i finished those ages ago,i can`t stop reading these boards. They`re very addictive. Anyway, having become very dismayed with Lucas` attitude toward Star Wars, and the OOT in general (ye Gods the GOUT is awful), i decided the only way i was ever going to get the OOT in DVD quality was to do it myself. So i set about de-specialising and colour correcting the 2004 DVD`s. Easier said than done. Having experimented with chroma replacement (not easy), and colour level adjustment (just plain difficult and time consuming- LucasFilm did a proper botch job on these) i decided to us an avisynth filter called colourlike, and thought i`d share the results. Now, taking histograms from the GOUT doesn`t work, because contrary to how it might appear, the colour levels aren`t different enough (it doesn`t visibly look like it, but the blue levels of the THX edition aren`t so far off the SE). So, i captured the original Pal Pan And Scan laserdisc of Empire with which to take the histogram for it`s respective film, and lo and behold the results are stunning. First a comparison using the histogram on GOUT and SE:

Image1

And some shots of just the SE before and after:

Image2
Image3
Image4

There are, however, issues with this method. Because of the blue tint used, some blue detailing is "eaten" by the filter:

Image5
Image6

Notice the lighting of the echo base entrance and the core of chewies welder. Lukes lightsabre also suffers, but not so much that it`s noticable if you`re not deliberately looking for it. And only on the interior shots of the battle with Vader on Bespin. I suspect that might be more to do with Lowry`s algorythm than the histogram, since his lightsabre looks rubbish in the original SE on these frames as well. There`s also this:

Image7

For some reason the Lost in the Snow sequence suffers from a strange almost tourquoise glow that lessens or worsens depending on the scene. It begins with Luke leaving the ice cave, and ends at the cut to the speeders searching for Han and Luke. This`ll need to be manually corrected, but even this is proving difficult as i just can`t figure out how LucasFilm "colour corrected" it to mess it up so much. Certain scenes within this sequence (e.g Leia by the X-Wing, and the droids at the entrance), come out okay. Odd. But, for nearly all of the film this method has worked really well, and looks absolutely splendid. Yes, that`s the word. Splendid. I now just have to figure out what they`ve done to the lost in the snow sequence..