[Gimp-user] Photos negatives scanned into the gimp

[Joao Moreira]

Hi,

I just took some photos negatives (memories from the pre-digital days 
:-) and
put them on my flat bed scanner. So now I have a color image of these 
negatives
in the gimp, so how do I go about turning them into a positive ?

I would expect this to be a very simple operation, like a subtraction, 
on each
pixel, right ? does this exist ? is there a tool/filter that does this ?

Or do I need to code a plugin, and if so, what exactly is the operation 
to be done
(in terms of RGB) ?

Thanks,
Joao

-- 
Joao Moreira de Sa Coutinho
[EMAIL PROTECTED]


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Re: [Gimp-user] Photos negatives scanned into the gimp

[Joao Moreira]

jim feldman wrote:
> Like others have said, you were probably better off to have done this
> while scanning using either xsane or vuescan (not open source, but a
> pretty good scanner prog).  I'm surprised whatever s/w you were using
> didn't give you the option when you told it you were scanning color negs. 
>   
I have an HP LaserJet 3057, and I just did "Acquire" in the gimp... but 
maybe
the option was there, I don't remember. I'll try that again, though.

I'd like to thank Alex for the link to www.c-f-systems.com, they have a 
paper
there, called "Negative to positive", that seems to explain it all. But 
it is
definitely NOT simple !

Thanks all,
Joao

-- 
Joao Moreira de Sa Coutinho
[EMAIL PROTECTED]


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