I have a Canon DSLR 650D, and I want to know if there are any settings or features in the camera that will only catch/accept the predefined color. For example, I just want to capture only red color and everything else should be B/W.
Please don't suggest Adobe Photoshop — I want to do this in-camera.
The effect you want is called "selective color" and most cameras can't do in-camera (and I personally think this is a good thing, but that's just my opinion).
You do need to do it in post processing, you don't have to use Photoshop, there are many image editors that can do this, some of them are even free (for example GIMP)
The Canon 650D/Rebel T4i does not include the capability to do selective color in-camera. Several Canon compact digital cameras offered the feature. The Nikon D5100 is an SLR that includes the capability for selective color via in-camera processing after the image is captured via the Retouch menu.
You can't do advanced manipulation like that in camera. In general, most DSLRs are limited to relatively simple or special stuff like limited HDR processing, simple B/W or basic cropping. Advanced editing like selective coloration require post production work and often require some matte painting to get it to work the way you want. It doesn't have to be Photoshop, something like GIMP could also do it, but you can't do it in camera.
