ISO Speed
This setting adjusts the sensitivity of the camera to light. When ISO Speed is set to the default Auto setting, the camera selects the best ISO speed for the scene.
Lower ISO speeds will capture images with the least amount of grain (or noise), but result in slower shutter speeds. If taking a picture in low light conditions without a flash at ISO 100 or below, you may want to use a tripod. In contrast, higher ISO numbers allow faster shutter speeds, and can be used when taking pictures in dark areas without a flash, or when taking pictures of fast moving objects. Higher ISO speeds produce pictures with more grain (or noise) and, therefore, can be of lower quality.
1.In the Capture Menu (page 61), select ISO Speed.
2.In the ISO Speed
the 
buttons to highlight a setting.
3.Press the 
button to save the setting and return to the Capture Menu.
If the new setting is anything other than the default Auto setting, the icon for the setting will appear in the Live View screen.
The ISO Speed setting remains in effect until it is changed again, or until it resets to the default Auto setting when you turn the camera off. To save changed settings, use My Mode (see page 55).
NOTE: The ISO Speed setting does not apply when recording video clips.
78 HP Photosmart R717 User’s Manual