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comparison: FILM vs DI


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#1 Igor Zhiklenkov

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Posted 11 December 2006 - 07:41 AM

Hi, guys!
Can somebody help me and answer the question: How can we unambiguously define differents between original film material and DI materials??

Try to explain...

One way: we shot a scene on camera (and, for example, used Kodak 5201 negativ film),
develop negativ, scan it "fullframe" and then shooting
whith ARRILASER( or diferents recorders) at original camera negative (the same Kodak 5201).
What is the tichnical diferents between these negatives??

Another way: we have only a positive copy. In this case, how can we
define, what part of material shot on camera and what part after DI
process??

thanks a lot for answers!
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#2 Stephen Williams

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Posted 11 December 2006 - 09:21 AM

Hi, guys!
Can somebody help me and answer the question: How can we unambiguously define differents between original film material and DI materials??

Try to explain...

One way: we shot a scene on camera (and, for example, used Kodak 5201 negativ film),
develop negativ, scan it "fullframe" and then shooting
whith ARRILASER( or diferents recorders) at original camera negative (the same Kodak 5201).
What is the tichnical diferents between these negatives??

Another way: we have only a positive copy. In this case, how can we
define, what part of material shot on camera and what part after DI
process??

thanks a lot for answers!


Hi,

Original camera negative that can be contact printed (anamorphic + N35 1.85)

If you scan film to output on film, that is a DI.

Stephen
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#3 Igor Zhiklenkov

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Posted 11 December 2006 - 09:59 AM

tahnks, but diferents between difinitions I know!!!

I askes, what are the tichnikal diferents in resulting negatives, traditional and after DI??
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#4 Stephen Williams

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Posted 11 December 2006 - 10:05 AM

tahnks, but diferents between difinitions I know!!!

I askes, what are the tichnikal diferents in resulting negatives, traditional and after DI??


Hi,

Loss of quality with a D.I. There can be advantages but there is no such thing as a free lunch!

Stephen
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#5 Igor Zhiklenkov

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Posted 11 December 2006 - 10:17 AM

In theory - may be.
can we compare in common, whith some formal params?? I don't speak about concrete negative, in case, if I havn't original and DI negatives in my hand, only one of them...I mean, what is the source of this negativ??
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#6 Stephen Williams

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Posted 11 December 2006 - 12:33 PM

In theory - may be.
can we compare in common, whith some formal params?? I don't speak about concrete negative, in case, if I havn't original and DI negatives in my hand, only one of them...I mean, what is the source of this negativ??


Hi,

The only formal params will be from the film without a D.I. Once you start scanning, images get resized fixed etc.

Stephen
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#7 Igor Zhiklenkov

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Posted 11 December 2006 - 12:38 PM

Hi,

The only formal params will be from the film without a D.I. Once you start scanning, images get resized fixed etc.

Stephen


But, if I scaned fullframe and then printed it also fullframe with rounded corners??
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#8 Stephen Williams

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Posted 11 December 2006 - 12:46 PM

But, if I scaned fullframe and then printed it also fullframe with rounded corners??


Hi,

I tested a 3K scan downsized to 2k & 6K scan downsized to 4k, at ARRI, on the same machine on the same day. The pictures don't line up, here is a 14 pixel offset! FWIW they don't know why!

Stephen
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#9 Igor Zhiklenkov

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Posted 11 December 2006 - 12:57 PM

Hi,

I tested a 3K scan downsized to 2k & 6K scan downsized to 4k, at ARRI, on the same machine on the same day. The pictures don't line up, here is a 14 pixel offset! FWIW they don't know why!

Stephen


I have ARRISCAN at my work, and test the same.
Again BUT: if I have separate negative, and I have to compare for pixel offsets with nothing!!! How can I proof, that it is original negativ??
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#10 Stephen Williams

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Posted 11 December 2006 - 01:02 PM

I have ARRISCAN at my work, and test the same.
Again BUT: if I have separate negative, and I have to compare for pixel offsets with nothing!!! How can I proof, that it is original negativ??


Hi,

You will have to know, you could trick somebody if you wanted to! I guess only having 1 take of each scene is the give away!

Stephen
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#11 David Venhaus

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Posted 12 December 2006 - 04:42 AM

I have not tried this but I assume that you could tell the difference if the negative was examined with high enough powered magnification. If you knew what to look for, the differnences would be apparent.
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#12 Igor Zhiklenkov

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Posted 12 December 2006 - 04:59 AM

I looked with 800x ZOOM and saw no differents.
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#13 Stephen Williams

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Posted 12 December 2006 - 05:14 AM

I looked with 800x ZOOM and saw no differents.


Hi,

Well if you print the film & project it you will see the difference!

Stephen
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