You'll want to know how to change the DPI of an image in Photoshop so you can print high-quality photos. DPI stands for dots per inch and usually 300 DPI is the standard; however, for professional ...

Settings of 300, 600, or 900 DPI, typically used for high-quality prints, could render file sizes that approach or exceed a gigabyte per image. This is really reserved for gallery-quality printing.