www.picturedisk.net picture files are scanned at a maximum bit depth of 32 (16.7 million colors).
The bit depth is the setting on the computer that determines how many colors can be displayed at one time. If the bit depth of the file exceeds the bit depth of the computer's operating system then colors are simulated with ones that are available by dithering.
For example, if your system is set to display 256 colors and you open a photographic picture of 24 bit depth, it will look fine with a little dithering. Two or more photographic pictures will NOT display properly side by side on this hypothetical system.
A system with a bit depth of 16 to 32 can easily display multiple photographic picture files simultaneously.
| bit depth | max. # of colors displayed |
| 1 | 2 |
| 2 | 4 |
| 4 | 16 |
| 8 | 256 |
| 16 | 32,768 |
| 24 & 32 | 16.7 million |
To check or change your computer's bit depth settings:
Windows
Display Properties Control Panel, Settings Tab
Colors (bit depth) & Screen Area (resolution) can be adjusted here
Macintosh OS 7, 8, & 9
Monitors & Sound Control Panel, Monitor Button
Color Depth (bit depth) & Resolution can be adjusted here
Maximum bit depth depends on the following variables
- Operating System
- Video Card installed
- Monitor Size & Type
- Amount of Video RAM
- Screen Resolution
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