Thanks. I think that will help when I get serious about scanning again.
Chuck Norcutt
On 10/8/2010 10:08 AM, Ken Norton wrote:
> Moose spoke thusly:
>
>> I'm not entirely in agreement with him. When scanning color neg film with
>> an ICC profile, I usually find the scan to
>> look quite good "right out of the box". However, I still am mostly
>> interested in the histogram at that point - and he is
>> the well known master printer.
>>
>
> Moose's ICC profile applied in the scanner software is really just applying
> a pre-programmed curve to the image file. It's a time saver for getting the
> image close to the way the film renders a standard scene in standard
> lighting to a standard result. Absolutely no different than AA's "Zone
> System" which was a calibrated way of doing ICC profiles before there ever
> were ICC profiles.
>
> Since Moose referenced VueScan, let's address that. When you do a scan with
> VueScan and a decent scanner, one can turn off all the color adjustments.
> Perform a preview scan and see how light or dark the image is. Altering the
> scanner exposure (first tab) is no different than adjusting the exposure in
> a camera--it's a way to get the basic exposure as close to YOUR raw file
> ideal as possible. Some with ETTR, some will EFTM, some with ETTL. The
> histogram is a great guide. Once you have the entire histogram comfortably
> within limits (the Nikon scanners make this easy as they have gobs of DR),
> then you can scan and save this file making believe in your head that it's
> just a RAW file from a digital camera--as it is exactly that. The scanner is
> a digital camera and the scene just happens to be a macro picture of a flat
> see-through object, not a 3D distant image. So treat it as such.
>
> So, Moose's ICC profile is pretty much like the ICC profile digital cameras
> apply to the image data when you are doing in-camera JPEGs. Actually, it is
> no difference at all.
>
> Ctein applies his own curves (which is all an ICC profile is) to the image
> file in PhotoShop. Moose applies them in VueScan. Same thing, the curves are
> applied in exactly the same way post-scan. The scanner is doing absolutely
> nothing different. Tabs 2, 3 and 4 in VueScan are all post-scan. Only Tab 1
> addresses the physical traits of the scanner itself.
>
> AG
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