Tuesday, January 1, 2019

Basic Reference Guide to Movie Restoration

1. Films
2. Transfer (Digitizing)
3. Color Correction / Restoration


1. Films

First and foremost, film reels used to shoot movies are vertical, not horizontal like the header of my blog which is film for still camera.

Here are the most common types of 35mm film format used to shoot movies.

- Cinemascope 4-perf (2.35) Anamorphic Cinematographic Process

- Widescreen 4-perf (1.85) Spherical Cinematographic Process
- Super35 3-perf (1.85) Spherical Cinematographic Process
- Techniscope 2-perf (2.35) Spherical Cinematographic Process


As can be seen in the picture above, there is 2 different ways of shooting a 2.35 aspect ratio movie.

1 - Cinemascope 4-perf (Anamorphic Cinematographic Process)

2 - Technicope 2-perf (Spherical Cinematographic Process)

Cinemascope vs Techniscope


Interesting fact---> Since Techniscope (2-perf) was cheaper than Cinemascope (4-perf), a lot of exploitation films were shot Techniscope for budgetary reasons. In other words, for your 400 feet reel, you get twice the number of frames with a 2-perf reel as opposed to a 4-perf reel.

Interesting fact---> Cinemascope has twice the vertical resolution as opposed to Techniscope.


Interesting fact---> Cinemascope and Techniscope both offer a different look.

Spherical Cinematographic Process Lens Flare Signature (1)

Anamorphic Cinematographic Process Lens Flare Signature (2)

Before talking about digitizing, one must know what elements can be digitized.

- Cut Negative which is made of the OCN (Original Camera Negative)

- Answer Print
- Interpositive
- Internegative (Dupe Negative)
- Release Print (Projection Print)

Not sure what are these, please have a look at the following Kodak Optical Workflow chart. For the whole Kodak .pdf document, please click here.



Important---> The optimal source to digitize is the Cut Negative as every time you create a copy in the optical world you loose detail, loose color fidelity and you add more grain.

Important---> You can't watch a negative as the colors are inverted, you have to do a positive copy in order to watch the Cut Negative. This is what the Answer Print is for. It is a positive copy of the Cut Negative.

Important---> When you shoot a movie, it is quite possible to have to shoot a scene over the course of many days which can lead to unbalanced shot to shot when watching the first Answer Print iteration.

Important---> Believe it or not, they used to do Color Correction in the optical world (in a laboratory) so the shots match. Deliverance's famous day for night sequence was originally done that way too.

Important---> When satisfied with all the color correction from screening let's say 6 iterations of Answer Prints, the final Answer Print is labeled Interpositive. Could it be use as a reference when restoring the movie from the OCN? I bet it could!

Ok, now I'm confident you guys understand that the OCN  are not color corrected and that an Interpositive contains all the color correction as well as any additional optical work, things  like superimposed credit at the beginning of the movie for example.

Basically, the Interpositive is a second generation copy, it is a positive copy and it's the finished movie.

Important---> An Interpositive has 2 layers of grain, one from the OCN and one from the Interpositive itself. An Internegative has 3 layers of grain, one from the OCN, one from the Interpositive and one from the Internegative itself. Same thing goes for a Release Print (Projection Print) which has 4 layers of grain since they're next in the chain.


2. Transfer (Digitizing)

Film elements can either be digitized using a process called Telecine or by a process called Pin-registered Scan.

Open Gate Pin-registered 2K Scan of Techniscope Film (3)

A Telecine is limited to 1920x1080 and is done in real time. The resulting transfer ends up on a digital tape (HDCAM SR). The tape is then digitized to files like .mov (Prores 422 HQ) and sometimes to .dpx.

A Pin-registered Scan can either be 2K (2048x1556), 4K (4096x3112). A scan is usually done pin-registered (this stabilize the film a lot) and can take many seconds just to scan one frame.

Pin-registered Scan leads to better details. The grain structure will also be smaller and more refined with a scan.

Since the quality of scanned film is superior to the quality of a Telecine, therefore a Telecine is cheaper than a Pin-registered Scan.

The grain of a Telecine will most of the time end up being bigger than the grain of a Pin-registered Scan.

Some brands of Telecine equipment can result in noisy digitized files and images rendered with a non-organic texture. A good example of that would be the Telecine done at LVR Video in Italy. I would describe the texture as if you were watching the movie through a screen door just like in the picture below. I must admit the texture is less obvious in motion but still, it's there.

Non-organic LVR Video Telecine Texture (4)

Here's a frame that shows how the texture of a 2-perf Techniscope movie should look like when digitally transferred. Whether you like it or not, this is how film looks when properly scanned.

Organic 2K Pin-registered Scan Texture (5)

Interesting fact---> 2K or 4K? Well, in the past few months I've read many posts where people complained about movies being scanned at 2K rather than 4K. Ok, from 2003 to 2012, I happened to work in the visual effects industry as a Digital Compositor for movies shot on 35mm and the resolution of the scans always was 2K. In the early nineties, engineers working for Kodak came up with a file format named Cineon and concluded that it wasn't possible for a human eye to distinguish film that went digitized then printed back on film from the raw film when projected on the silver screen. To me, 4K is kind of just to make sure you're really not loosing anything.

Interesting fact---> Grain should be judged in playback as on a still it might appear twice as big as it actually is. You also need to be at 1:1, not zoomed in, not zoomed out, 1 pixel from the image = 1 pixel of your monitor.



3. Color Correction / Restoration

Restoration Color Correction Philosophy

Should a restored movie on Blu-ray offers the closest experience to a cinema screening of a pristine Release Print? In my opinion, yes! Yes but without the 4 layers of grain discussed earlier. To me, the most important thing is, the colors, they have to match those of a pristine Release Print. So, how do we achieve that? Here's the workflow:

- Scan / Telecine of the Original Camera Negative
- Color Correction using an Interpositive as color reference (Cineon Log file - Print Film LUT monitoring on a Rec.709 calibrated monitor)
- Export with baked-in Print Film LUT. This LUT emulate the colors of the Interpositive printed on a projection film stock so it looks like it’s projected in a theater.

References:

1. Frame from Nightmare City Blu-ray, UK, 2015, Arrow Video (FCD1112)
2. Frame from The Fog Blu-ray, US, 2013, Shout Factory (SF 14172)
3. Frame from the "Restaurationsvergleich" extra from Don't Torture a Duckling Blu-ray, Germany, 2015, 84 Entertainment (8731)
4. Frame from the European Cut of Dawn of the Dead Blu-ray, Japan, 2013, Happinet (BBXF-2062)
5. Frame from What Have You Done to Solange Blu-ray, UK, 2015, Arrow Video (FCD1198)

Tuesday, June 21, 2016

Blu-ray - Vampyres, US, 2010 (1974), Blue Underground (BU7019BD)


FPS: 23.976
Aspect Ratio: 1.85
Region: A

Film
No information.
I don't think this transfer is from the Original Camera Negative, an Interpositive at best. I also believe that the master used for this release is made of at least two different elements.

Normal quality element

Lower quality element


I'd like to add that I'm pretty sure Vampyres, just like Symptoms, was framed 1.37:1. I do find that on many occasions, the framing appears to be a little tight when cropped to 1.85. Here's an example.


Transfer
No information.
Looks quite like a Telecine.

Color Correction / Restoration
No information.

While rewatching Vampyres lately, I was surprised to see that José reused at least one shot from his previous movie, Symptoms.

Frame from Vampyres.

Frame from Symptoms. (1)

References:
1. Symptoms (Limited Edition) Blu-ray, 2016, US, Mondo Macabro (MDO164).






Blu-ray - Symptoms (Limited Edition), 2016 (1974), US, Mondo Macabro (MDO164)


FPS: 23.976
Aspect Ratio: 1.33
Region: A-B-C

Film
Transfer from Film Negative. (1)
Symptoms aspect ratio controversy.

Transfer
No information yet.

Color Correction / Restoration
Restoration at CINEMATEK - Royal Film Archive of Belgium. (2)

As natural and organic the transfer looks, I find that some scenes lack texture as if it had been degrained, properly degrained but still, degrained a tad too much. I would also point out that the color temperature and hue as well as the gamma can vary quite a bit from shot to shot during some sequences, in keeping, I suppose with the original material, the Original Camera Negative. I guess a reliable color reference for this movie was impossible to find so they probably decided not to color correct it rather than revisiting it which would explain why the movie colors appear that unbalanced.

Here's an example of 3 back to back shots that don't match.




References:
1. Back cover.
2. Slate at the beginning of the movie.






Tuesday, June 14, 2016

Blu-ray - Nightmares Come at Night, US, 2013 (1970), Redemption (R033)


HD Master Visual Essay on the restoration of Nightmares Come at Night.

FPS: 23.976
Aspect Ratio: 1.66
Region: A-B-C

Film
35mm Answer Print. (1)

Transfer
CNC, Paris, France. (1)

Color Correction / Restoration
Color Correction and Encoding by Crawford Media Services, Atlanta, US (1)(2)

References:
1. HD Master Visual Essay on the Blu-ray.
2. Slate at the end of credits.






Blu-ray - Don't Torture a Duckling, Germany, 2015 (1972), 84 Entertainment (8731)


Restaurationsvergleich featurette on the restoration of Don't Torture a Duckling. (German only) (1)

FPS: 23.976
Aspect Ratio: 2.35
Region: B

Film
2-perf 35mm (Techniscope) Original Camera Negative.

Transfer
Open Gate 2K Telecine on a Cintel DSX at LVR Video, Rome, Italy. (2)


Color Correction / Restoration
Color Correction and Restoration at TLEFilms, Brandenburg, Germany.

References:
1. Restaurationsvergleich featurette included on the Blu-ray.
2. Gianni Vittori at LVR Video.






Wednesday, August 19, 2015

Blu-ray - Nightmare City, UK, 2015 (1980), Arrow Video (FCD1112)


Nightmare City (Incubo sulla città contaminata) is presented in its original aspect ratio of 2.35:1 with mono sound.

Nightmare City has been exclusively restored in 2K resolution for this release by Arrow Films.


The Original 2-perf Techniscope negative was scanned in 2K resolution on a pin-registered Arriscan at L'Immagine Ritrovata, Bologna. The film was graded on the Baselight grading system at Deluxe Restoration, London. Thousands of instances of dirt, debris and light scratches were removed through a combination of digital restoration tools.


Unfortunately at some point during their history the negative elements for Nightmare City were subjected to heavy damage and photochemical decay, resulting in regular instances of heavy density fluctuation/image flicker, colour fluctuation and chemical stains. These instances of damage appear intermittently throughout the film.


Alternative source elements were examined, but the only other existing pre-print element, a 4-perf reversal dupe negative, proved to be of unacceptable quality. As a result, this project relied completely on the damaged but complete original negative as its picture source. In doing so, although much of the worst instances of damage have been minimised, this presentation still shows the considerable problems with the material.


This release also provides the option of viewing Nightmare City from a High Definition Restored version produced by Minerva Films/Raro Video. This version used the aforementioned 35mm 4-perf reversal negative as its source element, and as such appears much softer overall in comparison with the 2-perf negative sourced Arrow restoration. This element was not subjected to the same damage as the negative and as a result, appears much cleaner overall. However, unlike the Arrow presentation, grain management and other DNR-type processing software tools were used to achieve the results of this presentation. (1)

Nightmare City and the limits of restoration featurette looking at the differences between the two transfers included on this release. (2)


FPS: 23.976

Aspect Ratio: 2.35
Region: B

Film

2-perf 35mm (Techniscope) Original Camera Negative.

Transfer
Pin-registered 2K Scan on an Arryscan at L'Immagine Ritrovata, Bologna, Italy.

Color Correction / Restoration

Color Correction and Restoration on Baselight at Deluxe, London, UK.

References:

2. Nightmare City and the limits of restoration featurette included on the Blu-ray.






Wednesday, July 29, 2015

Blu-ray - Beyond The Darkness, US, 2011 (1979), Shriek Show (SSBD-1005)


Licensed by Variety Communications, Italy. (1)

FPS: 23.976

Aspect Ratio: 1.78
Region: A

Film

2010 Interpositive from the 16mm Original Camera Negative. (2)

Transfer
No official information but it's clearly a Telecine.

Color Correction / Restoration

Color Correction and Restoration at Heavy Light Digital, New York, US. (3)