Trichromy - RGB color separation

Pál_K said:
Spectacularly good results, dourbalistar - those colors look so pure and clean!
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Thank you, Pál_K, much appreciated!

CharlesDAMorgan said:
I'll see how I get on with GIMP. I suspect my lack of technological knowhow will be the main issue!
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I had no prior experience with GIMP (or Photoshop for that matter) but the instructions I followed are very good. I'm no expert, but happy to share my process if you have questions.
 
I think this is my best result so far. :)

Nikon FM2n, AI Nikkor 50mm f/1.8S, Ultrafine Xtreme 400, developed in LegacyPro L110 at 1:31 for 5.5 minutes. Three individual black and white frames shot through Tiffen #25 Red, #58 Green, and #47 Blue filters, respectively, then combined using GIMP to create a trichrome color image.


2020.05.09 Roll #244-04727-positive-trichrome.jpg by dourbalistar, on Flickr
 
dourbalistar said:
Nikon FM2n, AI Nikkor 50mm f/1.8S, Ultrafine eXtreme 400, developed in LegacyPro L110 at 1:31 for 5.5 minutes. Three individual black and white frames shot through Tiffen #25 Red, #58 Green, and #47 Blue filters, respectively, then combined using GIMP to create a trichrome color image.
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I haven't dropped into this thread for a little while, @dourbalistar... I see that you've been getting more really excellent results. Great stuff - keep at it! :)
 
tbhv55 said:
I haven't dropped into this thread for a little while, @dourbalistar... I see that you've been getting more really excellent results. Great stuff - keep at it! :)
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Thank you! Ran out of steam for a bit, but looking to get back to making a few more attempts.
 
Some roses from our front yard.

Nikon FM2n, AI Nikkor 50mm f/1.8S, Kentmere Pan 400, developed in LegacyPro L110 at 1:31 for 5.5 minutes. Three individual black and white frames shot through Tiffen 25 Red, 58 Green, and 47 Blue filters, respectively, then combined using GIMP to create a trichrome color image.



2020.05.09 Roll #244-04738-positive-trichrome.jpg by dourbalistar, on Flickr
 
Very nice, @dourbalistar! You've mastered this technique. I doubt anyone could tell that this wasn't taken as a colour photograph.:)

Edit: The only clue that it offers is that (IMO) the colour density is slightly better than a colour photograph.
 
As a student I worked for a couple of days with a pack shot photographer just off the Earls Court Road.

He was doing in camera separations using a 5 x 4 studio camera, filters etc. At the time it was cheaper than having a repro house do separations and b/w film and processing was of course much cheaper too. I remember it being important that the image on the negs was the correct size for print.
 
tbhv55 said:
Very nice, @dourbalistar! You've mastered this technique. I doubt anyone could tell that this wasn't taken as a colour photograph.:)

Edit: The only clue that it offers is that (IMO) the colour density is slightly better than a colour photograph.
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tbhv55, thank you, that's much too kind of you. These are among my first attempts, so I can hardly say that I've mastered the technique. :) I have noticed that some colors can come out very punchy, even with no additional vibrance or saturation added in post processing.
 
A total eclipse of the filters... ;)

1st Generation Mitsubishi Eclipse / Eagle Talon / Plymouth Laser (1990-1994).

Nikon FM2n, AI Nikkor 50mm f/1.8S, Ultrafine eXtreme 400, developed in LegacyPro L110 at 1:31 for 5.5 minutes. Three individual black and white frames shot through Tiffen #25 Red, #58 Green, and #47 Blue filters, respectively, then combined using GIMP to create a trichrome color image.


2020.05.14 Roll #245-04793-positive-trichrome.jpg by dourbalistar, on Flickr
 
1966 Chevrolet Caprice.

Nikon FM2n, AI Nikkor 50mm f/1.8S, Ultrafine eXtreme 400, developed in LegacyPro L110 at 1:31 for 5.5 minutes. Three individual black and white frames shot through Tiffen #25 Red, #58 Green, and #47 Blue filters, respectively, then combined using GIMP to create a trichrome color image.


2020.05.14 Roll #245-04799-positive-trichrome.jpg by dourbalistar, on Flickr
 
When I see these pics, I can’t help but wonder if this effect could be replicated purely through software. I’d never want to shoot color film again! But I don’t know anything about software.
 
Peter Jennings said:
When I see these pics, I can’t help but wonder if this effect could be replicated purely through software.
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Yes, it can be done in very easily in Photoshop, using the merge channels function.

My guess is that it's also possible using Gimp. That program has a reputation for being a powerful tool, but I know very little about using it.
 
tbhv55 said:
Yes, it can be done in very easily in Photoshop, using the merge channels function.

My guess is that it's also possible using Gimp. That program has a reputation for being a powerful tool, but I know very little about using it.
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But is that without using three images shot through three colored filters? That was what I was really wondering about. Specifically, could software replicate the three-color filter effects using a single b&w negative?
 
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