How to paint a particular area eg. t-shirt in a image without selecting it using android?

Im trying to change the color of a t-shirt in andro开发者_如何学JAVAid. The image contains a t-shirt with a background. I don't like to go for a png file.

I want to know how to find the edges of the t-shirt so that we can paint the particular area.

Is there any way to do it??

Thanks and Regards, Srinivasan

You can try some algorithm of Edge detection. Look at this wiki.