Interpolation or increasing the size of your digital image file.
Image resizing can be completed in a whole variety of imageing applications. Probably one of the best known is Adobe PhotoShop, however there are many alternatives, both expensive and cheap, both good and bad on the market today.
We would recommend the use of either Adobe PhotoShop or Genuine Fractals for a good quality interpolation of image files.
With the popularity of digital imaging now, many image purchasers prefer to interpolate the files themselves; however, if you are purchasing a file and would like us to interpolate the file for you please email email@example.com, where we will be happy to help.