As the Canon G15 is a very new model, support is not yet available through Camera Raw. In the meantime, try out the software that came with you camera, to see if it can export a TIF or JPEG, which should open up in Photoshop just fine.
Hopefully support for the G15 will be available in the next Camera Raw update. You can find a list of supported cameras here: http://www.adobe.com/products/photoshop/extend.html
Thanks, Howard. I did manage to get a G15 CR2 file opened in the Canon software & subsequently moved to Photoshop CS6. I’ll keep an eye out for the next CR2 update.
Hi. This forum is for beginners trying to learn the basics of Photoshop. I'm moving your question to the Adobe Camera Raw forum for specialized attention to your situation.
Thank you, I’ll keep an eye out.