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[filmscanners] RE: 3 year wait

  • To: lexa@lexa.ru
  • Subject: [filmscanners] RE: 3 year wait
  • From: "Kapetanakis, Constantine" <KAPETAC@polaroid.com>
  • Date: Tue, 14 May 2002 08:15:11 -0400
  • Unsubscribe: mailto:listserver@halftone.co.uk

You are absolutely right.
 Now,knowing the pixel dimensions and the physical size of the film format
you are imaging you can calculate the corresponding dpi if you would like.
To see wether the film recorder will actually record all addressable pixels
you need to print a very simple image. Using Photoshop make an image that
consists of one pixel wide black (0) and gray (128) alternating lines. Print
the image and if you see these lines under magnification then you got out of
the film recorder all that it has to give.
One very critical required maintenance for the Polaroid film recorders or
any film recorder using a CRT, is the cleaning of the CRT itself. You must
do this periodically. Similarly to your TV at home, if you don't clean the
face of the tube reqularly (in some instances you can write your name on the
tube) you will loose a lot of contrast.

-----Original Message-----
From: Arthur Entlich [mailto:artistic-1@shaw.ca]
Sent: Tuesday, May 14, 2002 4:09 AM
To: KAPETAC@polaroid.com
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 exactly a 3:2 ratio, which is also used for a 35mm film frame.

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.


Laurie Solomon wrote:

> Arthur,
> I make no claims to expertise or to being even all that knowledgable with
> respect to film recorders.  I recently picked up cheap on Ebay a Polaroid
> Digital Palette 5000s film recorder to play araound with and learn
> about film recorders and recording.  It is obsolete and 35mm; and may have
> been a bad buy since it looks as if the lamp inside may be going which may
> cost a couple of hundred to fix or replace.  It claims to be a 4K
> but I suspect that it is probably more accurately a 2K + recorder only
> capable at its maximum 4K setting of nominally achieving 4K.

<much cut>

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