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[OM] ( OM ) Scanning and on-screen resolution

Subject: [OM] ( OM ) Scanning and on-screen resolution
From: "Brian Swale" <bj@xxxxxxxxxxxxxxx>
Date: Sat, 25 Jan 2003 20:11:49 +1300
Hi folks,

This might possibly open a can of worms, but anyway, here goes.

I've been playing with a print, about 8 x 12 inches, and scanned it at a 
variety 
of resolutions. Mostly this was due to my scanner misbehaving horribly, and 
swapping parts of the image around, and I tried several scanning resolutions 
to find if that would get around the misbehaving.

In the process, I found this.

When I scanned at 66 pixels/inch (25.98 px/cm) I got an image that was
(height = 20.01 cm / 520px / 7.87 in.)
(width = 29.56 cm / 768 px / 11.6 in.) as a pdd file

I presume the jpeg I converted it to is the same.
I adjusted colour and brightness, and did one simple sharpen. I did not re-
size. The image has come out quite sharp with none of the over-sharp 
artifacts one sometimes sees, including none of the white halo effect.

When I scanned at 168  px / inch then after adjusting colour, brightness and 
contrast, resized and sharpened in that order (I think) I just could not get it 
as sharp no matter what method I used, and sharpening artifacts appeared 
quite quickly..

Brian

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