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

Various different things can impact on image quality. File format, compression techniques, resolution and colour depth can all affect it.

Changing file formats affects the image qualities greatly, changing an bitmap to a jpeg. This is because it sacrifices files size for quality. This is because they are greatly compressed, and easier to post onto certain websites.

Resolutions play a big part of the image quality. In general, the smaller the resolution the worse the actual image looks, for example 640x480 would look less defined and more pixelated than 1200x1086. A lower resolution is easier to save than a higher and is a common form of compression.

The only way of compressing a file size without loosing quality is by cropping and resizing. This generally doesn't doesnt affect what the image looks like, but when the image is blown up in size it will appear pixelated and rendered useless.

Changing colour depth can also be used to compress a file. When this is done, the actual look of the image is changed significantly and generally doesn't look as good.

Basically the bigger the file size the better the image quality will be, any form of compressing will affect the image quality in a negative way.