I have a Nikon D90 DLSR and and from time to time I want to convert color photographs these into B&W photos. I use the open-source and completely free GIMP to edit the pictures and do B&W conversion.
Using the built-in grey scale conversion often doesn’t come out to nicely, so I was wondering how to emulated the classic B&W films using the channel mixer in GIMP. I turns out that Petteri Sulonen on his blog www.prime-junta.net had done just that. On the left I am showing the Channel Mixer window in Gimp to converting a color photography using the Ilford XP2 Super channel settings. Below is list of his findings (I have done this mainly to have a online copy in case his blog goes offline).
My only small contribution is a ZIP file with all the profiles saved as GIMP channel mixer settings files, so the profiles can easily be loadd: GIMP-BW-film-Channel-Mixer.zip 6KB.
| Film Name | Red | Green | Blue |
| Agfa 200x | 18 | 41 | 41 |
| Agfapan 25 | 25 | 39 | 36 |
| Agfapan 100 | 21 | 40 | 39 |
| Agfapan 400 | 20 | 41 | 39 |
| Ilford Delta 100 | 21 | 42 | 39 |
| Ilford Delta 400 | 22 | 42 | 37 |
| Ilford Delta 400pro | 31 | 36 | 33 |
| Ilford FP4 | 28 | 41 | 31 |
| Ilford HP5 | 23 | 37 | 40 |
| Ilford SFX | 33 | 36 | 31 |
| Ilford XP2 Super | 21 | 42 | 37 |
| Kodak Tmax 100 | 24 | 37 | 39 |
| Kodak Tmax 400 | 27 | 36 | 37 |
| Kodak Tri-X | 25 | 35 | 40 |