[filmscanners] RE: 3 year wait

["Laurie Solomon" <laurie@advancenet.net>]

Art,
The 8K is typically what is thought of as being for medium format and 16K
for 4x5, although one can use 4K recorders for medium format and 4x5 or 8K
recorders for 4x5 format ( but the quality would be from fair presentational
graphics to poor presentational graphics quality in most cases.)

I found a very informative bit of literature that might be of interest to
you at the following link:
www.presentingsolutions.com/adviceinfo/adviceandinfofilmrec2.html
The article title is Film Recorders: Understanding the Specs

It seems that the 4K, 8K, and 16K designations refer to lines of resolution
not line pairs, as I may have suggested and assumed: but lines are used as
merely another name for pixels so 4K referrs to 4000 addressable lines or
pixels across the horizontal side of the film frame. Resolution referring to
addressability not necessarily to sharpness, which has as much to do with
the size and nature of the spot relative to the CRT size (3" or 7" CRT) -if
not more - than with the number of lines or spots.

Alas the more I read the more confused I get. :-(

-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Arthur Entlich
Sent: Tuesday, May 14, 2002 8:52 PM
To: laurie@advancenet.net
Subject: [filmscanners] Re: 3 year wait


Hi Laurie,

Of course, you are correct about that last figure for 8K, I didn't study
the whole chart when I was typing it, and the 6K isn't the correct ratio
either, now that I look at it.  They may be a compromise toward 4x5"
(although the narrow dimension isn't wide enough) or another film ratio.

For instance, one Agfa model indicates the 35mm dimensions for 2K and 4K
as shown in the original posting.  They then show dimensions for
120/220, 3.25 x 4.25, and 4x5" of:

2K at 2048 x 1536
4K at 4096 x 3072

Art



Laurie Solomon wrote:

> Art.
>
> Thanks for the info.  I may have been misinformed with respect to LPI.  I
> can accept and agree with your conclusions in the last two paragraphs.  I
am
> not sure that "an 8K image is 8192 x 6144 pixel" will be " exactly a 3:2
> ratio, which is also used for a 35mm film frame" only because in film
> recorder speak I think that there may be a differetiation between "an 8K
> image" and "8K" as it relates to the recorder hardware designation specs.
I
> think that the "image pixel figures" you give are software generated and
> apply to a 8K film recorder using a 35mm CRT but would be different for
one
> using a larger film format CRT.  Moreover, a 4K film recorder would not be
> capable of an 8K image even if the software would be capable of showing
such
> a setting; and there are, to the best of my knowledge, no 6K film
recorders
> (an 8K film recorder may be capable of generating such an image if the
> software were set for that).
>
> Once again, I think that the literature and popular wisdom is very
> ambiguous, vague, and confusing when it comes to film recorders.  Those
who
> are in the know appear to have formed a secret society in which knowlege
is
> passed on privately sort of like the craft of magic. :-)
>
> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> [mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Arthur Entlich
> Sent: Tuesday, May 14, 2002 3:09 AM
> To: laurie@advancenet.net
> Subject: [filmscanners] Re: 3 year wait
>
>
> Hi Laurie,
>
> Thanks for the rundown on your research on film recorders.
>
> You inspired me to dig up my file on film recorders. What I can fathom
> from the literature here, the "resolution" numbers translate to a round
> down of the total addressable pixels across the long side.
>
> What I show is a 2K image is 2048 x 1366 pixels
> a 3K image is 3072 x 2048 pixels
> a 4K image is 4096 x 2732 pixels
> a 6K image is 6144 x 4608 pixel
> an 8K image is 8192 x 6144 pixel
>
> These are an 8K image is 8192 x 6144 pixel.
>
> So, this is basically the number of pixels in the total image,
> regardless of the magnification involved.
>
> I don't think it directly relates measurable lines of resolution, but to
> addressable points on the screen, sort of like Epson printers have 2880
> x 720 addressable points per inch, but that doesn't indicate the
> resolution of the image.
>
> Art
>


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