Image Size Image size refers both to the height and width of the image in pixels and the file size. Large graphics take a long time to download over the Web and many people will become impatient. Try to keep your graphic files less than 35K in size. Image resolution also affects the size of an image.
Most image editing programs have commands to change the resolution.
For example, in Adobe Photoshop choose Image Size from the Image menu to set the resolution. Also make sure your graphic is not larger than 600 pixels wide. Images wider than that require scrolling on smaller monitors. Most graphics applications have commands that display the size of the image in pixels. For example, in Adobe PhotoShop choose Image Size from the Image menu to see the dimensions of an image.