The industry standard for “High Resolution” is 300dpi or higher. There are three factors affecting file size:

  1. Resolution 
  2. Dimensions 
  3. Compression Ratio

If you decompress the file in a professional editing suite, you will see that the file size is in the 10-20 megabyte range. High resolution (300dpi) images are sufficient for all digital applications and most physicals up to 8×10.