----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, September 18, 2000 11:40 PM
Subject: Re: Group Scan site has posted SS4000 scans
> The best way to see if the hardware has noise is to carefully
> analyze the raw scan from the scanner. Just get a histogram
> of the darkest part of a scan and check the histogram width.
>
> Regards,
> Ed Hamrick
OK, for light reading I've attached a zip file containing these two histograms.
The ss4000 histogram is after I resampled it down to 2720 dpi in Photoshop.
This averages the noise and gives the Polaroid a head start which it needs when
going up against the Canon [1].
And it turns out I had saved a 16 pass version of the Canon back when I scanned
this slide (actually it might have been only 8 pass but who's counting). Since
this feature is available on the Canon (but not on the Polaroid) I figured it
was fair to use that image [2] (it was a jpeg also).
It's not the raw scan from the scanner but the protocol does specify bp=0.0%
and wp=0.001%, default white balance and no filtering etc which presumably is
close enough.
I was going to attach the corresponding cropped hat sections for people to look
at but they were just too big for a mailing list. So I'll just summarize what
I saw. Visually the noise was
In conclusion, the histogram tells the story.
Cheers,
Byron :))
[1] - Just joking folks, keep your shirt on... :)) But it really is resampled
down to 2720 dpi to match the Canon, I wasn't kidding about that [2].
[2] - Actually, I decided that adding a few more variables will allow everyone
to interpret the answer as they want and thus everyone can go to bed happy...
:))
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ss4000_and_canon_histogram_noise.zip
