Digital BW, The Print

I was wondering if it's really necessary to use filters at all: I can't
believe it's not possible to start from a color image in Photoshop and
simulate infrared in the B&W conversion - lighten green, darken blue...
Shouldn't be so hard...

You can get close by using mostly red in the channel mixer, but infrared has
quite a different luminescence than colour film. Foliage is rendered much
lighter, and skin tones have an almost transparent quality.