I did make it to Palouse Falls State Park late in the day, actually it was good timing, the sun was still illuminating the falls but low enough that there was a rainbow in the mist. Here's the image I shot.
I'm really more of a black and white kind of a guy but occasionally I shoot something that really depends on color as the primary subject matter. Rainbows mostly fall into the 'color' category.
But I have seen a black and white image of a rainbow, it was really amazing, really! (I don't recall the artist, I wish I did so I could give credit.) I've tried to process this, and other rainbow images, in black and white and I just can't duplicate the appeal of that other image. I think it ruined me, once you've seen perfection it's hard to settle for something less.
If anyone has any tips for processing a black and white rainbow, I'd love to hear them.