Re: [APML] 16-bit Slide Scanning Question

["Franklin A. Holub" <lists@my-spot.com>]

Alen,

I have spent a lot of time using the DiMAGE Scan software (V1.0.2) and have
become familiar with some of its quirks. First of all, and worst of all,
there is no way to set the black point and white point until after the image
has had its levels clipped by the software and the damage has been done. So
when an image is saved using the "16 bit" option - its levels will be
clipped and the data is forever lost. By the way, this "clipping feature" is
much worse with negatives then with slide film. When the image is saved
using the "16 bit linear" option, the data is not clipped. Slides only need
to have gamma adjusted (from 1 to 2.2 or so). Negatives will appear negative
but without the orange mask, apply gamma correction and then invert (make it
positive). Then you can process to taste.
Of course, a better way is to just use Ed Hamrick's Vuescan (which is what I
normally do)...

Frank
http://www.my-spot.com


----- Original Message -----
From: "Alen Koebel" <alen_koebel@yahoo.ca>
To: "APML" <astro-photo@seds.org>
Sent: Thursday, January 02, 2003 7:19 PM
Subject: [APML] 16-bit Slide Scanning Question


> I'm trying out a Minolta DIMAGE Scan Dual III
> and came across something I hadn't expected:
> a choice between two types of 16-bit scans,
> Linear and not (the latter presumably gamma
> corrected). This is in addition to 8-bit
> scanning, of course. Which type of
> 16-bit scan should I choose for astrophotos?
>
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