I own a C200 Zoom and have a question on the file size produced by this DC:

When I talk a picture using the Super HQ mode, the size is about 1 MB, but when taken under HQ mode, the size is bout 0.5 MB. When I open the file up in photoshop, the pixel remain the same, though I see a slight improvement of picture quality in SHQ mode. (by the way, the resolution of both mode is 72 dpi)

The question is: why file size difference while the nos of pixel remain the same? Is that because of the different compression method used? or what. Is there any real advantage using SHQ when printing 4R or 5R photos?

Thanks in advance.