You have likely set the camera to shoot photos in low resolution, or high ISO or both. Check your camera manual for detailed instructions on how to set these options.
If you don't have your computer manual, you can
download one from this page at Canon.com. This is for the Powershot S500, this is the same camera as your IXUS 500, they just gave it a different name in different countries.
Always set the camera to shoot in the highest quality resolution mode. Memory cards are relatively cheap and you don't want to end up getting that photo of the lifetime but because you shot it in a low resolution mode you can't get a good print!
If you are shooting in low light the camera may be automatically boosting the ISO. There are only 3 ways to shoot in low light:
1) Flash - only works when your subject is relatively close to the camera.
2) Increase the ISO which results in noise in the dark areas of the image.
3) Use a tripod and a long shutter (slow shutter speed).
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