When making prints it is usually better to have more pixels than you need rather than not enough, and generally when shooting it is a good idea to use the maximum resolution setting of the camera as quite-by-chance masterpieces can then be enlarged to
The problem with shooting at the camera’s maximum resolution is that big pictures take up more room on the memory card, which means you won’t be able to fit so many on. The only proper answer is to get a bigger card, although there are tricks that can
squeeze more images into the same space.
In digital photography compression is a method of condensing the information contained in your images so they take up less space. Little bits of data that the camera thinks it doesn’t need can be thrown away to make storage more efficient. For example,
rather than the camera remembering pixel 1 is blue, pixel 2 is blue, pixel 3 is blue, and pixel 4 is blue, which requires eight bits of data to be stored it might just record that pixels 1-4 are blue – which could be stored as two bits of data; the range
of pixels and their common colour.
Compression does not alter the physical size of the image – a 1.4 million pixel image will still be 1000x1400 pixels - but it does reduce the amount of data that has to be stored about that picture. With heavy compression an image can be reduced from
1000KB to just 88KB, which makes it easier to store as well as to transmit via email.