The resolution of a six-inch photo is 1200* 1800 pixels, the photo size is 4*6 inches, and 300 pixels/square inch is recommended for photo development.

1 inch =2.54 cm, and the photo size is usually in inches (referring to the long side of the photo). The conventional standard of photo size is 2 within 10 inch, for example, a 5-inch photo is 5× 3; 7 inches = 7× 5; 8 inches =8×6. If the photo size is larger than 10 inch, the difference is 4, 12 inch =12× 8; 14 inch =14×10; 18 inch = 18× 14.

Extended data

1 inch 2.5*3.5cm 4 13*295, ID photo 3.3*2.2 390*260.

2 inch 3.5*5.3cm 626*4 13

2 inches smaller (passport) 4.8*3.3cm 567*390

5 inch 5x3.512.7 * 8.91200x840 or more10.00 million pixels.

6 inch 6x415.2 *10.21440x960 or more1300,000 pixels.

7-inch 7x517.8 *12.71680x1200 or more 2 million pixels.

8-inch 8x620.3 *15.21920x1440 and above 3 million pixels.

10 inch10x8 25.4 * 20.3 2400x1920 more than 4 million pixels.

12 inch12x10 30.5 * 20.3 2500x2000 or more 5 million pixels.

15 inch15x10 38.1* 25.4 3000x2000 6 million pixels.

The length and width of the image size are in pixels, and some are in centimeters. Pixel and resolution pixel are the most basic units of digital image, each pixel is a small point, and points (pixels) of different colors gather together to become a moving photo. Digital cameras often use pixels as the basis for classification.

Baidu encyclopedia-photo size