Sd has images as shown on my panasonic TV but my camera, Canon G12 and mac iphoto says no images

Hi, Barry.

Thank you for visiting Apple Support Communities.

I understand that you are unable to import photos from your digital camera to your iMac. Here are some troubleshooting steps that I would recommend going through for this issue. I would also suggest attempting to import these photos using Image Capture via the camera and SD card.

iPhoto: Troubleshooting Camera Connections

Image Capture: Transfer images and other items from your device

Cheers