Bob
I'm surprised that a 6x8 tranny output  required only 40mb
My 8k film recorder needs a file sized 67mb to make a 6x8cm tranny without 
interpolation
Even at this resolution I can tell the dupe from the original If side by side on a 
light
box !
if viewed independently one simply can not tell but direct comparison by a "trained " 
eye
will see the difference.
Regards
Michael Wilkinson. 106 Holyhead Rd, Ketley, Telford, Shropshire. England .TF1 5DJ
 44 (0)  1952 618986.  www.infocus-photography.co.uk
For Negatives & transparencies from digital files


----- Original Message ----- 
From: "Bob Croxford" >
I have also seen a digital dupe which output via LVT onto Velvia film.
> Pixel counting was used so that the scan lines and output lines exactly
> matched. The original and the dupe were indistinguishable. The file
> size was very close to 40Mb for a 6x8cm piece of film. Allowing for the
> fact that litho repro will never manage to pixel match we need a file
> 1.4 times bigger for press. This is why so many of us standardise on
> 55Mb files for uses like stock pictures where we don't know what size
> the repro will be. I use 72Mb for Xpan to enable the image to be
> cropped and still have good height. A magazine cover sale yesterday was
> a vertical crop from a horizontal frame.

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