How many pixels in 4x6 picture?

The number of pixels in a 4x6 picture depends on the resolution (DPI - dots per inch) used. For example, at a resolution of 300 DPI, a 4x6 picture would be 1200x1800 pixels, resulting in a total of 2.16 million pixels. At 72 DPI, it would be 288x432 pixels, totaling about 124,416 pixels.