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Re: [OM] BW film scan testing

Subject: Re: [OM] BW film scan testing
From: Ken Norton <ken@xxxxxxxxxxx>
Date: Sat, 23 Jun 2012 17:54:08 -0500
Well, that was productive.

I digitized the work print I had created. Then corrected the scan to
match the print. After that, I started opening up film scans and
manipulated until match. For the past hour, I've been duplicating my
settings with other films and subjects.

Here is where I am at right now. I would like somebody with VueScan to
try this and see what you think. I really don't want this to be a
one-man try, but would like this to be a bit of a collaborative
effort.

1. Scan the B&W negative as an "image". Use the following settings:

INPUT TAB:
Media: Image
Multi Exposure: Checked
Bits Per Pixel: Auto

CROP TAB:
Crop Size: Manual
Set the dimensions for the entire area, including gap and top/bottom mask.

FILTER TAB:
Everything off

COLOR TAB:
Color Balance: White balance
Black Point: 0
White point: 1
Curve low: 0.25
Curve high: 0.75
Everything else at 1 and sRGB

OUTPUT TAB:
TIFF File: checked
Name your tiff file
TIFF file type: 48 bit RGB

2. Open the file in your editor of choice. I'm using Picture Window Pro (PWP).

3. Convert file to 16-bit B&W

4. Invert (negative)

5. Open up the Curves control. Adjust ONLY the white point. If you do
this before cropping, you will need to adjust to the left of the bump
which is the top/bottom border. Do adjust the white point to the point
where the curve does a nice fillet out. It's OK that your image's
highlights are still slightly suppressed because the the grain
aliasing is causing some pixels to be lighter than they are supposed
to be. Do not adjust the black point or put any curves in it. Keep you
adjustment straight. ONLY adjust the white point.

6. Open up the Gamma Adjust control. In PWP, I'm applying a gamma
factor of 1.5 to 2.0, depending on the film. My input gamma is at 2.22
and my output gamma is about 4.5.

7. Open up the Curves control. If the blacks are clipping, go back to
the gamma adjust and back it off. Do make sure your blacks haven't
clipped. If clipped, your gamma adjustment was too aggressive. If your
curves are too far away from the left side, then go back to gamma
adjustment and use a little more aggressive of a setting. Once you are
satisfied that you are pretty close, adjust the curves to trim off the
gaps. At this point, I may go ahead and bring both ends in a bit to
get my exposure looking good.

8. Crop.

9. Edit, save, etc. to your heart's satisfaction.

Don't be fooled into thinking this is complex. It really isn't. Would
somebody please try this and see what you think?

Ken






-- 
Ken Norton
ken@xxxxxxxxxxx
http://www.zone-10.com
-- 
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