Epson provides ink cartridge yields based on the ISO/IEC 24711 and 24712 standard for ink jet products, which excludes the first installed cartridges. Prior to creation of the new ISO standard, Epson and other printer manufacturers provided yields based on their own internal standards. The new ISO standard is widely recognized as the most reliable method to test ink jet printers under standard conditions or for the purpose of comparing achievable ink yields from various competitive printers.
In accordance with the ISO standard for individual color cartridges, color yields are determined by taking an average yield, based on continuous printing, of all individual color cartridges. Individual cartridges conveniently allow the user to replace just the color of ink that has been expended. When using cartridges with combined color tanks, as do some competitive products, several colors of ink must be replaced when one color has been expended, so ISO ratings are based on the first color to be expended.
Replacement cartridge yields are based on ISO/IEC 24711 tests in default mode printing continuously. Cartridge yields vary considerably for reasons including images printed, print settings, temperature and humidity. Yields may be lower when printing infrequently or predominantly with one ink color. A variable amount of ink remains in the cartridge after the "replace cartridge" signal. All ink colors are used for printing and printer/all-in-one maintenance, and all colors have to be Installed for printing. For print quality, part of the ink from the included cartridges is used for Printer startup and a variable amount of ink remains in the cartridges after the "replace cartridge" signal.
Epson recommends that customers choose an ink jet printer based on their expected printing needs, considering page yields as just one factor of evaluation. Other important factors include image quality, fade resistance of prints, reliability and printer features.