Retrieving graphics object from image object

Question

I'am trying to retrieve a graphics object from an image object.But it is throwing the exception...graphics cannot b retrieved from an image having INDEXED PIXEL FORMAT.Cud u tell me the reason y??? Nature of my work: I'am trying 2 draw some shapes on 2 an image in a picturebox control.After drawing the image i need 2 rotate the image.While rotating i need my drawings also 2 b rotated. I have tried it with all sort of transformations and then also itz not working.So i thought of retrieving the graphics object from the image and draw the shape(rectangle) using that so that while i'am rotating the image the drawing is also rotated. Pleez help me as i'm less xperienced in C# Regards, MMX