Ahhhhhhhhhh ... let's take a step back ... and get some more information. 

In the camera setup, what are the number of pixels and what is the jpeg quality? 

In the PowerShot G9 Camera User Guide, pages 90 and 81 of the PDF or pages 78 and 79 of the paper copy ... you can see how to choose resolution ... you want either RAW or L - Large and also S - Superfine.  The next page explains how to record both a large, fine jpeg and also RAW. 

Another setting to check is the Scene mode Page 91 in the pdf.  Too bad their Portrait mode gives a soft focus ... In any case, that would be something to play around with. 

Lighting is also an issue ... if it was bright and high noon, you would have strong contrast ... perhaps too strong.  Better light would be early morning or afternoon; an overcast day could be even better. 

HTH, but please reply if you want additional suggestions. 

--Martin