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Re: [OM] Scanning

Subject: Re: [OM] Scanning
From: Moose <olymoose@xxxxxxxxx>
Date: Sun, 13 Nov 2022 14:40:21 -0800
On 11/13/2022 10:05 AM, Wayne Shumaker wrote:
At 11/12/2022 03:09 PM, Moose wrote:
On 11/12/2022 6:52 AM, Wayne Shumaker wrote:
I came across a used LS-5000 scanner and was comparing it with my LS-4000 
Taken in 2004, I suspect with the 90mm macro on OM4-Ti, Provis 100F using 


Here are two scans straight from the scanners. The LS-4000 scan looks better. 
Of course I have always kept my scanner covered or in plastic for its life.
. . .

Overall, they are subtly different colors, and the 5000 is slightly brighter. 
At this remove in time, through the medium of film, who's to say which is more 
accurate. The 4000 has red channel clipping, the 5000 has that, plus some blue 
clipping. That could account for some of the color differences.

I don't know, of course, whether and how much putting them in 8 bit JPEG may 
have caused that. If it's there in the scans, adjustment of scanning set-up may 
I did rescan an image and specified 64bit tif files. Before it was set to 48. 
That seems to have helped in the clipping.

All you have done there is add an IR channel, for dust/scratch cleaning. It requires a whole second scan, which doubles scan time. If you aren't using it, no point. Both are 16 bit per channel for RGB. OTOH, I always use it, for real scans, 'cause dust abides.

There are other VueScan settings I am not quite sure about. Namely the Color 
curve low/high setting.

I think the settings you want to look at, in the "Color" Tab, are:
Color Balance: I tend to use None or Neutral.
White Point: This is intentional clipping. Try changing the default of 1% to 0, 
0.1, 0.2%.
Brightness: Pulling this down a little may help hold the top.

The image looks flat during the scan but changes when complete as VueScan 
applies some settings. I guess I have a lot to learn.

What you see during the scan doesn't mean anything, other than that the scan is 

You may want to try saving to a Raw file, in Output Tab, for a couple of 

1. Take a look at the file in LR, ACR/PS, whatever; look at the histogram. Linear is Dark! Processing has to take that and turn it into something that looks good to our non-linear eyes. It gives some perspective on what's going on, both in VS and in Raw conversion programs for camera Raw files.

2. When futzing around with settings, it can be useful to work from a Raw file, as everything happens so much faster than putting the scanner to work redoing what it just did each time only to change a processing parameter.

When scanning multiple frames at once, esp. with multipass, one may just put the scanner to work and let it run for ages - to Raw files. Then, working from the Raw files goes very quickly. Then you can toss them.

Raw Moose

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