File Type: JPEG or TIFF
Create one of these file types by saving your image with the extension .jpg or .tif in your image-editing program (Adobe Photoshop, Microsoft PhotoEditor, etc.). Go to the File menu and choose "Save As." Then use the drop-down menu to select the file type.
File size: up to 20 megabytes (MBs)
Find the file size of any image by right-clicking on it and choosing "Properties" from the menu. It will appear as bytes (b), kilobytes (kb or k), or megabytes (mb or megs). If your file is bigger than 20 MBs, try saving it as a JPEG instead of a TIFF. Size isn't everything, however. Your image doesn't have to be as big as 20 megabytes. It's more important that you save it using the option for the highest quality available.