Re: High Resolution Scans
Re: High Resolution Scans
- Subject: Re: High Resolution Scans
- From: "stevej" <email@hidden>
- Date: Wed, 16 Apr 2008 19:42:51 -0400
----- Original Message -----
From: "John Massman" <email@hidden>
To: "MARK SEGAL" <email@hidden>; "colorsync" <email@hidden>
Sent: Wednesday, April 16, 2008 04:40 PM
Subject: Re: High Resolution Scans
> Everything you say is true but the original post wanted to know the max res
> to scan 4x5 was to get the best possible result. In other words what is the
> resolving power of 4x5 film under optimal conditions.
>
> >I think there may be some lack of clarity here. There is input resolution
> >(the number of pixels per inch created in the imaage file) and output
> >resolution (the number of pixels per inch in the document outputted to the
> >printer). And for sake of further clarity let us call this
>
As I recall most film manufacturers rate their E-6(Ektachrome) emulsions
at 125 LPM(Line Pairs Per Millimeter). This is under ideal conditions:
contact printed off a glass plate. By the time you account for lens defects,
camera shake, misfocus, and other optical anomalies, I'd guess a really
excellent camera system might transfer 50-80 LPM, but most systems aren't
any better than 25-50 LPM.
Hope this helps.
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