I was looking for some documentation on vignetting, in order to achieve a realistic one in computer generated images. This article by Paul van Walree explains quite well the phenomenon. I now have to try this cos4 law of illumination falloff in an actual shader.
Scott Kelby invited the photographer Peter Hurley to make a guest blog post. In this 15 minutes talk, he explains how important the jaw line is in head shots, and shows how it can dramatically improve the quality of portraits. Thanks Sylvain for pointing it out.
Snow suddenly started to fall over Tokyo last night, quickly building a white layer over the never ending city. I was too lazy to grab my gear and all the stuff one needs to get out during a cold night, so I just hoped the snow would still be there on the morning and decided that I would take my camera with me on my way to work.
It was still there (although it had become ice) and it was giving the morning sunlight some exquisite tones. I love the morning light anyway: grazing, harsh, drawing bold shadows on faces and buildings… But the reflections due to the snow really make a difference.
While waiting for the train on the platform, I wanted to take a picture of that girl on the other side, lit by that light. But I didn’t even have time to aim and the train was there already. I took the shot anyway, in the hope I would catch it through the window.
The result is a bit unexpected: the tinted glass and blacklit inside give the picture a film feeling, as if tones were post-processed and black mattes were added.
Graphics programmers are quite used to the idea of specular highlight. It is usually more or less understood, or accepted, to be the reflected part of the incoming light, on top of the one that sort of bounces in every direction and that is referred to as the diffuse part. The specular term happens to have a very physical meaning though (which I won’t elaborate on for this time) and the interesting property of being polarized while the diffuse part is not.
This property is used by photographers, who add polarizing filters to their gear in order to eliminate glares and reflections from their shots when taking photos through glass or water for instance.