Your stock needs will vary depending on project type. Use this guide when selecting the best size file for your project.
For each size option, Pine Tree Photography provides the size of the larger dimension of the photo. Most photos on PTP are taken at either a 4:3 or a 6:4 ratio. In other words, for an 800 px option, a purchased photo would have dimensions of either 800x600 (4:3) or 800x533 (6:4).
The dimensions below are provided for a 6:4 image. Exact dimensions may vary for each image.
480 px @ 72 dpi: 480 px x 320 px, 72 dpi, 6.5 in. x 4 in., RGB
800 px @ 72 dpi: 800 px x 533 px, 72 dpi, 11 in. x 8 in., RGB
1600 px @ 72 dpi: 1600 px x 1066 px, 72 dpi, 22 in. x 14.5 in., RGB
2400 px @ 300 dpi: 2400 px x 1600 px, 300 dpi, 8 in. x 5 in., RGB
3600 px @ 300 dpi: 3600 px x 2400 px, 300 dpi, 12 in. x 8 in., RGB