M3 demonstrate the impact that file format, compression techniques, image resolution and colour depth have on file size and image quality.

In the screenshots provided you can see that the first image is not compressed and that the second however is. The following are all factors which help to compress a file, but at the users discretion and at the images cost. By altering a files format, for example changing a bitmap to a jpeg, can severely affect the quality of the image and if done to an extreme extent can make the image unclear and very pixilated. The resoloution of the image is lowered during the compression process and therefore can result in the image being pixilated and grainy. File compression can also be achieved by altering an images colour. By reducing the amount of colour in an image you can reduce its file size, but this reduces the quality of the image yet again. Cropping and resizing the image can save memory and can result in a not so greater loss of image quality.

The basic understanding is that the highter the quality and size of an image the larger the file size, and vice versa. The higher the resoloution and the more colour the image contains the larger the file is going to be. File formats are basically preset quality settings which detract certain qualities of an image to compensate for the amount of space in which the image is going to aquire.