Writes an image using an arbitrary ImageWriter that supports the given format to a File. If there is already a File present, its contents are discarded.

Parameters:

im		a RenderedImage to be written.
formatName		a String containing the informal name of the format.
output		a File to be written to.

Returns:  false if no appropriate writer is found.

Exceptions:

IllegalArgumentException		if any parameter is null.
IOException		if an error occurs during writing.