1. A method comprising: at a computer device, receiving and storing a plurality of original graphic image files each received from a different source and each having a different original aspect ratio that is different than a single specified second aspect ratio to which all the original graphic image files need to be transformed; for each particular original graphic image file among the graphic image files: determining a first aspect ratio of that particular original graphic image file; determining whether the first aspect ratio is wider, taller, or identical to the second aspect ratio to be used with a plurality of target image files; creating and storing a copy of the particular original graphic image file as one of the plurality of target image files using the second aspect ratio, by: using the computer device, automatically determining whether the first aspect ratio is wider than the second aspect ratio, and if so, using the computer device automatically re-sampling the particular original graphic image file to match a first dimension of the one or more target image files, and using the computer device automatically selectively cropping one or more left or right portions of the particular original graphic image file to form the one or more target image files having the second aspect ratio; using the computer device, automatically determining whether the first aspect ratio is taller than the second aspect ratio, and if so, using the computer device automatically re-sampling the particular original graphic image file to match a second dimension of the one or more target image files, and using the computer device automatically selectively cropping a top portion of the particular original graphic image file to form the one or more target image files having the second aspect ratio; wherein the method is performed using one or more computing devices.