What are high resolution and standard resolution?

All pictures have 24-bit pixel depth, or 16 million colors at 144 dots per inch. The high resolution setting produces a standard size photo, 4.44" x 3.33" at 640 x 480 pixels. A wallet size photo of 2.22" x 1.67" at 320 x 240 pixels is produced using the standard resolution setting. Example: A picture with dimensions of 4.44" x 3.33" at a pixel count of 640 x 480 will have the same dpi as the same picture at a 320 x 240 pixel count with dimensions of 2.22" x 1.67" (dpi=144 x 144 or 20736 pixels per square inch). The larger picture will have a much higher resolution due to the fact that four times the pixels will define the same section of the picture in the larger photograph.