Re: Scanner Exposure Control
Re: Scanner Exposure Control
- Subject: Re: Scanner Exposure Control
- From: Ken Fleisher <email@hidden>
- Date: Fri, 03 Nov 2006 02:19:02 -0500
On Nov 2, 2006, at 5:27 PM, eugene appert wrote:
Hi.
I’m not sure if this is related. I wrote in a couple of months ago with a similar problem, maybe even the same problem. I noticed that all our transparency Epson scanners including the 4990 scanned the IT8 white patch at roughly RGB 190. We are using Silverfast to manage to scan.
That is very interesting. Since you are getting the same maximum value for your white (190), it sounds likely to be an Epson issue. I can't imagine though that the scanner is designed to max the exposure at 190. Can I ask if the RGB ~ 190 was on a raw scan (no pre- or post-processing)? I am assuming it is, but I just want to ask to be thorough.
What is interesting is that on an identical set-up (same scanner model, same computer and OS version, same scanning software with the same settings, same target) I am getting RGB ~ 235 for the white. That is what makes it even more strange that your white is about the same as the problem white that I'm getting.
Ken Fleisher
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