D2

These are the different colour depth options for my real band photo i chose the default one as it had the best quality. As you can see the GIF and Png8 ones are distorted and the one in the bottom right is black and white and for these reasons I used the default one as it is clear and the colours stand out more. Also the one i chose had a good download speed which will be important on websites for example also it had the best image quality. The compressed images would be used for different things for example the black and white one (bottom left) could be used for books, the original could be used for posters and vehicles, the medium ones could be for websites or something that doesn't need massive images. These colour resolutions depend on what you want the image for.