How can one shoot for matte-painting using SLR

[jahangir]

Hello everyone!
I am new to photography. I want to know, how cameras could be used to create mattes for a later use with compositing software. One of the ways that I found which I would like to share with you all is, to expose the subject with a torch light while keeping the camera shutter locked open in a very dark room. But this method works only in dark rooms or during night times if outside.
If anyone has a better solution than this, then I would be obliged and very thankful.

You may also email anything that could be useful to me to jhscomputerarts@yahoo.com
I will really be thankful and consider you as a true friend for taking the pain for me.