Re: [Gimp-user] Rescuing old color negatives

[Guy Stalnaker <jimmyg521 gmail com>]

William,

I believe that you're dealing the "orange" color of the film substrate 
of the color negative film. A simple "invert" will not invert to a 
"normal" color positive. That orange color must be dealt with (as I'm 
sure is obvious to you by now).

I believe that this is what you should review:

https://www.youtube.com/watch?v=Ifwz7vxm4Mc

Simple steps

1. Colors menu > Auto > White Balance
2. Colors menu > Invert

See how that works for you.

To fine tune, Colors menu > Levels > select Black Point or White Point 
control and click on image where you know the spot is truly white or 
black and Levels will adjust (or use the Auto Levels control to have it 
calculate based on the total image).

Guy

On 4/19/21 6:24 AM, William wrote:
> Thanks for your appended reply.
>
> I tried the invert function and it is not doing what I want to do.
>
> I want to rescue old color negative 35mm film strips by inverting them to a color positive that I can print 
> on a color laser printer.
>
> The negatives have an orange cast which inverts to monochrome blue. I tried some other invert options and 
> could not get a printable photo.
>
> Can you please outline the steps in the procedure to do what I am attempting to achieve?
>
> Is there a download PDF user handbook or tutorial?
>
> Regards,
>
> William McCreight
>
>   
>
> -----Original Message-----
> From: Liam R E Quin [mailto:liam holoweb net]
> Sent: Sunday, April 18, 2021 8:10 PM
> To: William; gimp-user-list gnome org
> Subject: Re: [Gimp-user] Rescuing old color negatives
>
>   
>
> On Tue, 2021-04-13 at 14:35 +0200, William wrote:
>
> > Can Gimp 2.10.24 change a color negative image to a printable color
> > positive image?
> yes - colours->invert.
>
>   
>
> There is also Filters/Generic/GEGL Operation, and then in the pop-up
>
> box choose Negative Darkroom (requires a fairly recent GIMP, e.g.
>
> 2.10.24).
>
>   
>
>   
>
>   
>
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