Scan Lines

Phototoxin

Hi Peeps,

Just a question ; I'm scannign prints (not negs) and I notice these 'scan lines'

Any idea why/how they happen and any idea how to get rid of them ?



I'm using a lexmark scanner and I'm doing it at 600 dpi before knocking it down to 300 in photoshop. I think this gives more detail but I'm not 100% sure. Scanning is a bit experimental for me!

Phototoxin

erm bumpety bump?

Anyone know ?

Also am I on the truman show as over 3 different fora I posted 3 different threads and the same issue has happened... odd... maybe Friday the 13th doesn't like me..?

Fajitas!

Scan at a higher res, see how the lines come out. Tbh, I'd be blaming the scanner until that proves me wrong.

You *do* have to remember though, your scanning twain/software will have a preset that will try to give you the 'proper' exposure on everything scanned. Try playing with what it sees.

ThOnda

I am sorry, but I cannot see any lines. Just red ones that are hand painted.

CabanSail

I can see the lines. I would say they are across the whole image but are only noticable in the shadow sections.

First off ... I don't have a clue.

If it were me I would go through & check all the settings in the scanning software. Is it set to Photo & not Document? Do you have Grey Scale selected & not Black & White? I am not sure what the software looks like but that would be my first line of enquiry.

10-10-20

Scan lines are the same as print lines. It's a small variation in each of the linear scans where auto-compensation by the image controller occurs. It's a tiny change per scan-line, but the high-contrast areas show it more than others.
The scanner software/controller may have a RAW image-grab feature, or try troubleshooting by using a TWAIN application to determine the origin of the lines.

It's similar enough to the moire effect seen when newsprint images are scanned.
Maybe try using a newsprint filter to descreen it or a smooth-tool with a horizontal bias to hide/remove the lines.
http://www.scanhelp.com/288int/scontent/descreen.html

Phototoxin

Thanks people... and I here I was thinking it was a simple question but just that no one liked me =p

Great I will have to descreen-inate them.

mrmac

Try these two links for some info and advice on how to remove the lines:

http://www.skeller.ch/ps/fft_action.php

http://www.dvp.co.il/eyefidelitytools.html


HTH