Increasing image resolution
When photographers talk about increasing an image’s resolution, they’re usually referring to its pixel count. In this feature we’ll look at options to create more pixels that are available through editing software. Best results will be obtained if you start with the highest native resolution of the image sensor or, when scanning images, decide the size for the end use of the image to be scanned and set the scanner resolution accordingly. (As outlined in the previous issue of Photo Review, to make A4 sized prints from a 35mm slide requires a scanning resolution of 2400 ppi, while for an A3 print you should scan at 4800 ppi.)
The challenges of upsampling
The only practical option for increasing resolution in a
