This software used to be paid for (not sure how much) but now its FREE. The software is used to enlarge photos without loosing quality.
Below is some info from their website
Reshade enhances and up-scales your images to ultra-high resolution.
The application relies on our state of the art single-image photo enlargement algorithms to produce crisp-clear resizes.
Resize images without the usual blur, jagged edges, loss of sharpness or detail. Create photo resizes at all zooms up to 2000%. Speed up your work with keyboard shortcuts, drag-and-drop, etc.
Quickly enhance and resize images for print, high-res publishing, web design, etc. Reshade supports popular file formats such as JPEG, TIFF, PNG and color modes such as RGB and CMYK.