but still reduce in file size. It’s great for image quality, but doesn’t make a lot of difference to the actual file size as not much information can be removed without affecting image quality in some way, however minor.
there is roughly a square law when it comes to image dimensions and file size. If you double the width and height, you almost quadruple the file size. And that's assuming you've written the code to load the correct size of image rather than loading large image...