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Exposure and Film Stock Examples


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#1 Rafael Rivera

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Posted 07 October 2010 - 01:00 AM

About a year ago I was getting ready to shoot a music video with portions filmed in Super8. As a result I did a simple study of bracketed exposures using different Kodak film stocks: Ektachrome 64T, Vision2 200T and Vision2 500T. I used internal and external shots and kept a journal where I annotated many details. The results were extremely useful when the time came to shoot the music vid. I thought it a good idea to post a video with the results so here is the link to the test:

Watch in Vimeo:

View on Vimeo

Watch in YouTube:



And here's the music vid where I incorporated some Super8:

Vimeo:

View on Vimeo

YouTube:

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#2 ignacio benedeti

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Posted 10 October 2010 - 04:10 PM

Thanks for the test, very interesting. Your video is, also, very nice.

About a year ago I was getting ready to shoot a music video with portions filmed in Super8. As a result I did a simple study of bracketed exposures using different Kodak film stocks: Ektachrome 64T, Vision2 200T and Vision2 500T. I used internal and external shots and kept a journal where I annotated many details. The results were extremely useful when the time came to shoot the music vid. I thought it a good idea to post a video with the results so here is the link to the test:

Watch in Vimeo:

View on Vimeo

Watch in YouTube:



And here's the music vid where I incorporated some Super8:

Vimeo:

View on Vimeo

YouTube:


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#3 Carl Looper

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Posted 13 October 2010 - 02:05 PM

It would be good to see examples of Super8 filmstock, via the web/download, that were actually available/playable at the definition they were scanned. The highest definition playback I've ever seen, of a web delivered Super 8, (apart from above) was still only 960 pixels wide. And yet many are scanned at 1920 pixels wide. Of course an HD signal amplifys the grain of a filmstock, so spatially filtering such grain (by downscaling the image) is one way of cleaning up the signal - but then actually doing so means the result is no longer a test of the filmstock but a test of the filtering technique (intentionally or otherwise).

Carl

Edited by Carl Looper, 13 October 2010 - 02:07 PM.

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#4 Carl Looper

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Posted 13 October 2010 - 02:35 PM

Attached are cropped 3K wide scans of Tri-X Super 8.

Scan_raw - both sensor noise and film grain are visible here (and a little difficult to distinguish)
Scan_spatial - 4X gaussian blur (spatial integration filter) representing how Super8 transfers typically end up after web publishing
Scan_temporal - 3X temporal integration - adjacent frames are merged together to increase the defintion of the signal (called super-resolution).

Attached Images

  • Scan_raw.jpg
  • Scan_spatial.jpg
  • Scan_temporal.jpg

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#5 Rafael Rivera

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Posted 15 October 2010 - 06:17 PM

Thanks for the test, very interesting. Your video is, also, very nice.


Thanks Ignacio. I hope the test video is helpful to others.

I was asked some tech specs so here they are:
Camera: Beaulieu 4008 ZMII with 6-66 Schneider lens
Lab: AlphaCine
Transfer: Cinelicious URSA Diamond
Format: ProRes (10-bit 4;2;2) Standard Definition, 23.98 fps (pulldown removed with CinemaTools)
Web Format: H.264, Data Rate 6225 kbits/sec

Edited by Rafael Rivera, 15 October 2010 - 06:17 PM.

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#6 Nicholas Kovats

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Posted 11 November 2010 - 11:23 PM

Carl,

Please post these on the Super 8 Digital Signal thread on the other forum. These are great as a point of comparison and illustrate your previous scan type references perfectly!
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