Now its time to explore some of the unique features of Photoshop filters . Experiment with various filters located under the Filters menu. After you try one, select Undo from the Edit menu. There are some important relationships between image size, resolution and file size. File size is proportional to the square of its resolution.
File size is also proportional to the square of the image size.
Select Image Size from the Image menu. Experiment with changing the size and resolution of your image and see what happens to the file size. You can read more about these concepts in Chapter 8 of the Adobe Photoshop Classroom in a Book. Increasing image size decreases resoulution. Increasing image size increases file size.