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Interpositive vs Internegative Quality


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#1 Frank Chang

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Posted 29 August 2016 - 09:19 AM

How much of the image quality loss in terms of from interpositive to internegative?

I currently have a few "IN" that are 30 years old that are currently being approved

for 4K scanning projects. So far we only did one "IN" for a 15 minute feature and

the quality is great. But suppose if IP is used, is the quality going to be better?


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#2 David Mullen ASC

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Posted 29 August 2016 - 10:01 AM

IP and IN are the same stock, it's just that the image is always reversed from the previous generation.  In most cases an IN would be the next generation after an IP, though I suppose it is possible that someone would then make an IP from the IN for some odd reason.

 

The stock is very fine-grained so generational loss is minimal but if you can use the earlier generation, that's always better.

 

Technically an IN could be made from a camera original that is reversal -- in fact, technically the copy off of an IP is called a "dupe negative" and a copy off of a reversal original positive is called an "internegative" but today most people use the term IN or internegative to describe a dupe negative made off of an interpositive.


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#3 Frank Chang

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Posted 29 August 2016 - 10:15 AM

Thanks, David.

 

By the way, we have previously reviewed the IP (the IN that we have already scanned), but for some odd reason

the timeline (ie. order of the scene) are all mixed. (i.e. scene 3 comes before scene 1, etc). Not sure

why. And it is not spliced either. It is, however, marked as IP on the leader by hand.

 

Another odd thing is we also found a B/W film stock of the same scanned feature but all in B/W. Perhaps this was

a test copy?


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#4 David Mullen ASC

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Posted 29 August 2016 - 10:20 AM

Well if the IP is not spliced and the IN is not spliced, but they are ordered differently in terms of scenes, then that IN wasn't made from the IP...  unless someone was spending a lot of time in an optical printer re-ordering scenes as they copied the IP onto the IN.


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#5 Frank Chang

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Posted 29 August 2016 - 10:26 AM

Thank you, David.


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