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RE: [APML]: Stacking images in photoshop

To: "'astro-photo@nightsky.com'" <astro-photo@nightsky.com>
Subject: RE: [APML]: Stacking images in photoshop
From: Matthew Considine <mconsidine@wesleyan.edu>
Date: Sun, 15 Feb 1998 21:37:03 -0500
Reply-To: astro-photo@nightsky.com
Sender: owner-astro-photo@nightsky.com

Hi,
I've written a program that gets the internal 30bit data out of the PhotoSmart
scanner.  While it's still "alpha" software, anyone interested can check it
out at

http://auk.con.wesleyan.edu/~mconsidine/sing001.zip

It was written for someone who only wanted to scan 1 single frame, but
I generalized it to a negative of arbitrary length.  (FWIW, this is the 
work-in-progress version of the next version of MULTSCAN).  It is a
DOS-window command line program, but I hope to get a Win95 version
out at some point.

The way I've done it is 
        - specify 30bit pixel depth in the .INI file
        - do NOT save the "final" image, only the "header" and
                "data" files.  Put a ".RAW" extension on the data file.
Caution :  the resulting file can be monstrous.
In Photoshop, use the information from the .HDR file to tell Photoshop
how to import the .RAW file (ie. specify 3 channels, 16bits, interleaved, etc.)

FWIW, HP says in its documentaion that 30bits are not available to the 
outside user.  However, they assume that the scanner is accessed via a
TWAIN interface.  This software accesses the scanner directly.  As before,
the liabilities are the user's, though I haven't damaged my scanner yet :)

Regards,
Matt Considine

Wil wrote :

<snip>

Using an image-processing package which allows 16-bit or larger pixel values
avoids this by capturing the full value of multiple summed images. Some
scientific-imaging packages also allow pixels to be respresented by 16- or 32-bit
floating-point values, which has advantages for some kinds of numerical
processing.

> And this is really pretty much of a moot point anyway for those of us who
> shoot film, because all of the scanners may scan at more than 8 bits per
> channel, but you can't get more than that into a program because of the
> limits of the scanner software, as far as I know.

True, but stacking multiple images typically results in pixel values which
require more than 8 bits per pixel.

> Another question, do these scientific programs even support film scanners?

TIFF format is commonly supported by most imaging packages, and every scanner
driver I've seen can generate TIFF files.

> How would you get more than 8 bit per channel data into them from film?

If nothing else then by stacking, as discussed above. But I'm not sure there
aren't scanner drivers capable of more than 8 bits per pixel output (if there
aren't, here's a golder opportunity for someone). And of course most CCD cameras
generate 12 or 16 bits per channel.


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end
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