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RE: filmscanners: Scanner resolution (was: BWP seeks scanner)



This is a very good point.  I wasn't aware of it until a while ago - for a 
graphic illustration of colour channel sharpness differences, see John 
Brownlow's site:
http://www.pinkheadedbug.com/techniques/rgborgrayscale/rgborgrayscale.html

Paul

-----Original Message-----
From: Austin Franklin [mailto:darkroom@ix.netcom.com]
Sent: Friday, June 15, 2001 12:28 PM
To: filmscanners@halftone.co.uk
Subject: RE: filmscanners: Scanner resolution (was: BWP seeks scanner)

Typically, B&W is far sharper than color negative film, which is typically
sharper than chrome film (because of the double development which softens
the edges further).  Also, take a good look at your different channels.  If
you have a CCD scanner, you will find the red channel is soft.  This is for
two reasons.  One is smear, and the second is intensity.  Red "bleeds"
across to adjacent cells, and it also "blooms".  Both of these effects will
cause red to be fuzzy.

I'd suggest taking a good look at a decent B&W negative.

If you are going to be making B&W scans from a tri-color CCD scanner, don't
let the scanner do the B&W unless it does not use the red channel.  I'd
strongly recommend doing the conversion your self from either the blue
and/or green channel, and not use the red channel at all.




 




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