Here are sample crops from an artificially-lit scene at each of the Canon Powershot SX200 IS's ISO settings. When available, next to each of these crops, there is a crop from the Fuji Finepix F200 EXR at the same ISO setting. These are both digital cameras with 12 megapixels sensors but the F200 EXR is an ultra-compact with a 5X wide-angle zoom and a more limited feature set.

Images below are all unmodified 100% crops from their respective cameras. ISO sensitivity and White-Balance were set on the cameras, other settings were left at their defaults. Exposure was adjusted to keep the brightness as steady as possible across all ISO settings.

These crops help determine which ISO settings can be acceptably used on these cameras. As noise increases, most cameras compensate with noise reduction which introduces softness. The result is that, while you can partly reduce noise at the expense of details, the maximum acceptable print size gets smaller as ISO is increased. The point at which a print become unacceptably noisy is a matter of personal taste.

Canon Powershot SX200 IS

Fuji Finepix F200 EXR