How to convert a Image to an image file...

Hi,
I load an image file in my application and I am trying to run it through a filter and save it without modification.
So this leaves me with an Image object, which I would generally assume is easy to convert to a saved image file... But its not. It seems I need a RenderedImage to do this so I created this function
public static RenderedImage convertToRenderedImage(Image img,
int wid, int ht, int type){
BufferedImage bi = new BufferedImage(wid, ht, type);
Graphics2D g2d = bi.createGraphics();
g2d.drawImage(img, 0,0,wid, ht, null);
return bi;
}which actually leaves me with an image without content... it appears to be all background color, and no foreground text.
any ideas on how to make an Image into a saved Image file?

ImageIO.write?

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