Ken, this is similar to what I do, except that I scan in 16 bit grayscale,
and I use curves adjustments instead of messing with image gamma (not sure
you even can do that in photoshop, never tried). My testing years ago
showed no image quality difference between RGB scans and grayscale scans
so long as you scanned in high-bit (16 bit for grey, 48 bit for RGB) mode.
--
Chris Crawford
Fine Art Photography
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260-437-8990
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On 6/23/12 6:54 PM, "Ken Norton" <ken@xxxxxxxxxxx> wrote:
>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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>
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