New Post: Resizing & Padding

How exactly does the Resize() Method work? Is it Width x Height in pixels? Whenever I try to do something like... image.Resize(800,800) the output is not exactly as expected. The output file size is for example 395 x 800, I would assume it be 800 x 800. Also is there a similar method to add padding/whitespace to an image? For example, if the image is 555px x 1000px, I would like to make it 1000 x 1000 in which the width gets additional 445 px of whitespace equally.

Thanks!