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Hampsfell, Cumbria, looking towards the Coniston Fells (Jon) When you’re shooting in the red light of sunset you may not want the camera to ‘correct’ the white balance

Campfire in Wadi Rum, Jordan (Jon) Noise is random variation in brightness and colour

There may also be a choice of size settings. Large means the maximum image size possible from that sensor – 12 megapixels or whatever it is. Smaller sizes shrink the whole image to the equivalent of, say, six or three megapixels (this is not the same as trimming or cropping it). Again this is an advantage for email and web use but is essentially irreversible. You can’t resize a three-megapixel image back up to 12mp if you decide you do want to make an A3 print after all. Well, you can, but it will look terrible.

White balance

The colour of light – natural and artificial – varies widely. Most of the time our eyes adapt and we barely notice it. By default, almost any digital camera will be set to regulate the white balance automatically and this will probably give natural-looking colours under most conditions. However you may want to take control yourself. Perhaps you generally like a warmer or cooler result than the camera delivers, or perhaps there are specific circumstances where it doesn’t quite get it right. When you’re shooting in the red light of sunset you may not want the camera to ‘correct’ these colours (see ssss1).