How to have graphics path of a bitmap

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C#2.0

C#

How can we get the graphics path of bitmap image with irregular shape using getpixel or setpixel method. By using MakeTransparent method it just hides some part and region remains same having that hidden part but I want to remove that hidden part from the region and have new graphicspath from that modified region.


Suppose I have created a bitmap image which is having actual background black or red and the actual object on it which is to be only shown ignoring the black or red background. If I try using the MakeTransparent method, ofcourse it hides the black or red background but the region of that bitmap is same including that background color. So how can I obtain the new region excluding that black or red background.