Other specifications are as follows: 5 inches: 3R,3.5*5 inches, 89* 127mm; 6 inches: 4R,4*6 inches, 102* 152mm.
Common digital photo specifications
1, about d, the international practice clearly shows that the photo size is based on the short side of the photo. At present, the aspect ratio of photos taken by mainstream digital cameras is mostly 4 (height): 3 (width), and the letter d is added after it. For example, the actual size printed in 4D is15.2cm×11.4cm..
2. Regarding R, photos with the aspect ratio of 3 (height): 2 (width) are indicated by adding the letter R, for example, the actual printed size of 3R is/kloc-0 12.7cmx8.9cm.
3. Regarding RW, the aspect ratio is 3: 2 or 6: 5, which is often indicated by RW. For example, the actual printed size of 8RW is 30.5cm×20.32cm.