pixmap to jpg (or to gif or png) ?

[manu aradhya <manu_aradhya yahoo co in>]

hi all can any body tell me how can i convert pixmap
information to jpg or gif or png file.basically i have
pixmap some pixel information is written on it.i want
to save it as jpg or gif or png.

in avchive mail i saw this function 
gdk_pixbuf_save_to_file
but it is not in manpage.
                            -manu

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