Hello David,
It´s true Vuescan is now loading camera raw image files since 8.0 version
appeared. I think you are a little bit confused with precision bits colour.
A/D converters from old scanners, were 8 bit per channel and itwas a
nightmare to capture detail into very dense slides. If you increase your A/D
precison bit like Nikon LS-4000 ED 14 bit per channel, you´ll get wider
dynamic range and much better detail in dense slides. But if you add RGB
channels, (14+14+14) you´ll get a 42 bit precison image. Now you can imagine
from where is comming 48 bit (16+16+16). I don´t know any scanner into the
market with a dynamic range of 108 bit colour precision. Another important
thing is: It´s good to scan with the highest colour precision bits for
working into PS without losing data with your image adjustments; but when
you get your final image and you only want to save it, it´s time to convert
it to 24 bit becasue it´s plenty enough. (16,7 million colours) ;-)
I am working hard to get an Olympus E1 profile for 5500 ºK daylight. Vuescan
creates them with a very high precision, using 4096 points to create a TRC
curve. Gretagmacbeth Profilemaker only uses 512 points and you can see
clipping into your images and colour accuracy doesn´t work very well with
Digital Cameras. Maybe the new version 5, is better. I also have used Monaco
Profiler, Little CMS, XL Profiler, and Vuescan is the real winner!!! This
software is absolutely outstanding. If you want to create a very good
profile for your camera RAW images, buy Wolf Faust IT8/2 input targets.
And the last thing, PS works with 8bit and 16 bit images. If you have a 36
bit per channel drum scanner, PS will convert your image to 16 bit per
channel image. ;-)
I hope to help you with this.
Best regards,
David Irisarri
----- Original Message -----
From: "Moose" <olymoose@xxxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Monday, July 05, 2004 8:10 AM
Subject: [OM] RAW files aren't just for cameras.
> As I just mentioned, I've been revisiting the details of Vuescan. Although
I've used it for some time and update fairly regularly, I haven't really
kept up on what has changed or been added except as I encounter it in use.
>
> I don't know when it happened, but Vuescan Pro now does RAW files (maybe
it always did and I didn't notice? or see what it meant?). This is a pretty
cool feature. My scanner provides 36 bit color output and Vuescan can only
output 24 or 48 bit RGB TIFF files, so I have to either store less than the
whole available data or a big file partly full of nothing. With RAW files,
only the actual data from the sensor is stored. Also, as with camera RAW
files, one can go back to the RAW file and re-scan with different parameters
without actually running the film through the scanner again. Again like
better DCs, Vuescan can output RAW and/or TIFF and/or JPEG all in one scan
of the frame.
>
> Since I've found that more than 24 bit RGB isn't useful in most of my
scans, my new workflow is to scan to RAW and 24 bit TIFF. For those images
that I find need more luminance data*, or where I just blew the scan in some
way, I can redo the TIFF output very quickly without having to dig out the
film
> again.
>
> I recognize the long term electronis storage issues here, but haven't
worked out what I want to do about it yet. Of course I do keep the film.
>
> I don't remember Vuescan coming in 2 levels, i guess that happened while I
wasn't looking either. I guess whatever I bought was right, because my
updates are the Pro version.
>
> Moose
>
> *Mostly where lots of Levels, Curves, Contrast, Brightness etc. adjustment
is going to really cause some gaps in the histogram.
>
>
>
>
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> List nannies: olympusadmin@xxxxxxxxxx
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>
>
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