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OpenGL Conversion from Orthographic/Parallel projective image to Perspective image ?

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Hi..

For example, an image is projected onto a plane by using the Orthographic/Parallel projection (glOrtho) , then captured (screen shoot) using OpenGL camera.

So, it means that I have a parallel projective image.

I just want to know that how can I convert this orthographic captured image into the perspective image.

glOrtho => gluPerspective :Note: calculation must be applied to the pixels of the orthographic captured image

i.e.

M * [glOrtho_Image] = gluPerspective_Image

where "M" can be any matrix or calculation.

Thanks.

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