Standard American photo paper sizes:
4"x6", 5"x7", 8"x10", also 8"x12", 12"x18", 16"x20", 16"x24", 20"x24", 20"x30".
Standard European photo paper sizes: 9x13 cm, 10x15 cm, 13x18 cm.
European Passport photo size: 5,12 cm x 3,84 cm (2" x 1.5").
Format: | 35 |
Width: | 36mm |
Height: | 24mm |
Area: | 864 sq mm |
Diagonal: | 43.27mm |
This standard ratio for 35mm negatives corresponds directly to print sizes of 4" x 6" and 8" x 12" and 20" x 30", and is fairly close to 5" x 7" (1.4:1) and 3.5" x 5" (1.43:1).
Digital photo prints:
The aspect ratio of most digital camera pictures is not proportionate to the size of these standard photograph print sizes.
Most digital cameras reproduce pictures in the aspect ratio of 3:4.
Some print services introduce now photo prints in the 3:4 aspect ratio. It would be for instance a 4.5" x 6" paper print (11cm x 15cm).
Most document imaging resolution measures are in pixels (PICture ELement) per inch (or per mm - millimeter), and are commonly referred to as dpi (dots per inch) or dpmm (dots per mm). Most motion picture and still-photographic resolution measures are in pixels per image. This is most commonly seen in the 525 lines of NTSC (National Television System Committee), 625 lines for PAL (Phase Alternating Line) and SECAM (Sequential Couleur Avec Memoire or Sequential Colour with Memory), resolution of television images.
In pixels per image the horizontal resolution is given first. If the horizontal dimension is larger than the vertical dimension in pixels, the image or display is said to be landscape, if the horizontal is smaller, the image or display is said to be portrait.
dpi: dots per inch
ppi: pixels per inch
lpi: lines per inch
dpi and ppi, lpi: For digital images, we are dealing with pixels and for printing we are dealing with dots and lines.
300 dpi are needed to produce a photo-realistic image.
Suggested Pixels for different print sizes:
Photo Print Size | Suggested Pixels |
3" x 5" | 1024 x 767 |
4" x 6" | 1280 x 960 |
8" x 10" | 2400x3000 |
16" x 20" | 4800x6000 |