'Avedon's instructions to his printer' via - Monoscope
I can very well remember when someone posted a comment in one of my photo asking if the vignettes were done in-camera (and not in Photoshop). I replied that, no it's not done in-camera. And the guy posted in reply "Oh, I thought it was done in-camera"
I have nothing against post processing except that, like any other things, it must be done moderately and in a tasteful manner. Lest it'll turn out as a digital art and not a photograph.