Thu Aug 23, 2012 11:32 pm
Jeff - which program are you using - Photoshop or something else? You should be able to increase size without changing aspect ratio, whether manually or automatically.
If you're in Photoshop, go to Image/Image Size; then make sure that "Constrain Proportions" is checked. As long as the latter is done, you can change one dimension as you wish and the other will automatically increase by the correct amount.
If you're using another program, I'm probably not familiar with it, but I may be able to help if you tell me the options that you have for increasing size. If you have to do it manually, just increase width and height by the same proportion: for example, if you presently have width of 300 pixels and height of 400 pixels, you can (for example) change them to 600 and 800 respectively, doubling the image width and height, yet keeping the proper aspect ratio.