Tintii Photo Filter (formerly Tint Photo Editor) is a photo editor that allows you to black and white an image but preserving some parts in color; An effect very used at the artistic level, that can achieve very attractive and funny photographs.
The effect can be achieved with other programs like Photoshop or Gimp, but it requires a good command and knowledge of some of those tools to do so, while with Tintii can be done easily. It analyzes the photo and identifies groups that can be left in black and white or color, and try several alternatives until you get the desired effect. Obviously better results are obtained when there are strong chromatic contrasts between the areas that want to differentiate, with respect to images with pairs of tones.
It has 2 modes of execution, one as an individual application; And another as a plugin associated with other software, such as Corel Paint Shop Pro or Photoshop itself.
Tintii Photo Filter 2.6.2 is the latest version (updated in October 2012) of this software, which is available for Windows and Mac OS X (both in evaluation version) and for Linux for free.