Re: High Resolution Scans
Re: High Resolution Scans
- Subject: Re: High Resolution Scans
- From: "Bill Morse" <email@hidden>
- Date: Wed, 16 Apr 2008 08:11:39 -0400
Hi Frederick
There are two issues. The first is governed by the grain size of the film.
Is it fine-grained, generally slower film, or coarse-grained, faster film.
The grain structure of the film, combined with the optics of the camera
system, will determine the maximum information avaiable from the film.
Second is the resolution of the scanner/sharpness of the scanner optics.
Some people recommend scanning at the average grain size of the film, so as
to minimize grain aliasing. In my experience, it is almost always better
(assuming good focus in the origianl exposure) to scan at a much higher
resolution than the average grain size. Grain is not regular, like the grid
of a scan, but stocastic, irregular. To get all the information from the
film, you need to scan in and around the grain.
Given this, optimal (maximum) output size will vary widely, but from 4x5
film may go as high as 10x-20x for a Fine-Art print. For the highest
resolutions, a good drum scan at 16bit will always give you better results
than any other film scan.
Color correction is another question, and has little to do with the
resolution of the scan; rather, it is controlled by the accuracy and gamut
of the scanner-film profiling. That said, for fine-art reproductions,
scanning film is almost always inferior to a high-rez digital file from a
scan-back or Cruse scanner, because you have to deal with color inaccuracies
from two stages.
My opinions, YMMV.
Good luck with your project.
On Tue, Apr 15, 2008 at 5:29 PM, Frederick Park <email@hidden>
wrote:
> Dear Friends of Colorsync,
>
> I should like to inquire if any of you have knowledge of the highest
> resolution scan capabilities of 4x5" chrome in terms of ease of color
> correction and "best" or optimal final output size at 300 dpi. (Example:
> 500%, 5,000%, etc.) This project is two and three dimensional fine-art
> reproduction.
>
> Also I wish to ask if any of you know of service bureaus that provide
> archival output on paper 60+ inches wide with either pigment based inks or
> solvent based oil colors (wide gamut). Thanks for any help you may be.
>
> With highest regards,
>
> Frederick Park
> Asheville, NC
> www.apalache.com
> 828.505.2833
>
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