DPI identifies the resolution of the image based on the number of pixels dots per inch. It has nothing to do with the image quality, so why would someone want to change image DPI? Actually it depends on how you plan to use your image. The number of pixels set by default in most cameras is 72 dpi, and if you are simply going to send your photos via email this number is fine. But if you are going to print your photo you’ll probably need to adjust the final DPI for your printer. The DPI is the number that tells you how much detail is packed into the image file. The higher the DPI, the more information is being packed into the image file, and the larger the resulting image file is. More is not necessarily better though. For the majority of daily uses you’d be wasting ink to print everything in the highest possible resolution. For a letter or business document (even one with graphics), 300 dpi is going to look fine. For the average photographer, 1,200 dpi is excellent. Professional photographers would want to print something twice as larger, but once you get above 1,200 dpi, it’s going to be nearly impossible to see any difference in whatever you’ve printed. When you want to change image dpi you usually need to resize the image as well which means some quality loss, but ImageConverter Plus allows be changing image dpi without changing the image quality.