Not Moiré, that I would recognize. A random dot pattern.
I just went into Photoshop, opened a "new" doc, made the resolution 300 ppi,
and used the filter "add noise" at 18%, monochromatic, then used variations
with the step set to fine and added one step of blue and one of cyan and got
something that looks much like the sample he gave me. A very fine light
texturing of the paper with a cold blue-gray (with some green in it
obviously).
I will suggest that he try VueScan, but my sense of this is that since all
programs have to use XP's driver ultimately, it won't make any difference.
He's already tried three different scanners (all different models). The
problem is that the user software talks to the "virtual machine" which is
XP. As I write this I am thinking I am going to suggest that he reinstall
XP.
Thanks for the suggestions, I'll get him to try them anyway, one never knows
in trouble shooting something like this.
Brad
> It's not moire, is it? What is he scanning?
>
> Have him try a different scanning program - free trial of Vuescan. He can
> perhaps narrow it down to a hardware vs. a software problem.
>
>
>
> Maris
>
> Brad Davis wrote:
>> Hi,
>>
>> My electrician discovered that I know a little about scanning and
>> presented
>> me with this problem.
>>
>> He has an Epson 2400 scanner, hooked to a PC via USB2 - the PC is
>> running XP
>> personal. The Epson 2400 is his 3rd try at a scanner, the USB2 is the
>> second try at an interface. In all attempts, he gets a light
>> cyan-gray
>> random pattern across all scans. This shows most clearly in white
>> areas.
>> It looks very much like what I would get using Photoshop and doing a
>> random
>> fill with noise at perhaps 10%. (I've never done anything other than
>> a 50%
>> noise fill, so that number is a very rough estimate.) The gray
>> pattern,
>> while random, is much too regular to be from interference, and it
>> appears in
>> the image, on the monitor - it isn't being added by the printer. He
>> is
>> using the Epson supplied software to do his scans and has had
>> numerous
>> folks look at his set up with no one being able to figure out what is
>> causing the problem.
>>
>> That he has tried three different scanners seems to eliminate them as
>> the
>> cause. I wouldn't expect the interface to put in such an even (if
>> random)
>> dot pattern. I have no idea how XP might be at fault, but the one
>> thing
>> that would seem to be common is the XP driver for USB(1&2).
>
>
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