Archived posting to the Leica Users Group, 2002/02/05

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Subject: [Leica] Re: neg to positive in Photoshop
From: David Prakel <dgp@btconnect.com>
Date: Tue, 05 Feb 2002 09:13:23 +0000

on 4/2/2002 10:26 pm, Lea Murphy at owner-leica-users@mejac.palo-alto.ca.us
wrote:

> I'm going through some old 35mm color negs trying to locate several to have
> reprinted.
> 
> Using a flatbed scanner and Photoshop 5.5 is it possible to scan the negs
> and convert them to positives so I can see what I'm looking at?
> 
> I don't need high quality........just the ability to see what I'm looking
> at.
> 
> Any help is greatly appreciated...

Hi Lea - two issues here. If your flatbed doesn't have a transparency
adapter you will have to 'kludge' something. An inverted lightbox on top of
the negatives might work.

Because you are scanning colour negs manually and do not have the luxury of
automatic mask removal and the like you will need to do the following in
Photoshop:

1) Sample colour from orange mask area of clear film
2) create adjustment layer, fill with orange colour and invert
3) create another adjustment layer to invert negative
4) create another adjustment layer to deal with levels
5) Flatten image and print

It works but it is a long haul!

Best of luck
David Prakel

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