There are many different techniques and ways of creating a selective color images in Photoshop, let me show you the one where we use the black & white adjustment layer.
Camera images usually contain additional description about camera settings and scene information of the the picture taken. By using EXIF, you can view this data online.
Ig Nobel Prizes are given to serious scientists where result of research is to make people laugh, then make them think. Now they have just announced winners for 2012.