Image file size formula:
width * height * color / 1,024,000 = Megabytes (MB)
- Values for width and height must be pixels.
- For color, use the Bytes/pixel number from the table below:
| Color Depth |
Bytes/Pixel |
| 8 bit Grayscale (each pixel = 0 to 255) |
1 |
| 16 bit Grayscale (each pixel = 0 to 65536) |
2 |
| 24 bit RGB (8 bits for each R,G,B) "8 bit color" |
3 |
| 32 bit CMYK (8 bits for each C,Y,M,K) |
4 |
| 48 bit RGB (16 bits for each R,G,B) "16 bit color" |
6 |
Some Examples:
Flatbed scan, 8" x 10" @ 300dpi, 16 bit color
(8 * 300) * (10 * 300) * 6 / 1024000 = 42 MB (42,187 KB)
Flatbed scan, 8" x 10" @ 600dpi, 16 bit color
(8 * 600) * (10 * 600) * 6 / 1024000 = 169 MB (168,750 KB)
Flatbed scan, 4" x 5" @ 1200dpi, 16 bit color
(4 * 1200) * (5 * 1200) * 6 / 1024000 = 169 MB (168,750 KB)
Printed Poster, 24" x 36" x 300dpi, 8 bit color
(24 * 300) * (36 * 300) * 3 / 1024000 = 227 MB (227,812 KB)
Article ID: 196, Created: 4/19/2011 at 5:35 PM, Modified: 11/1/2012 at 5:37 PM