Two bits-per-pixel format is typically used for four-level grayscale displays, although any 4-entry palette will work. Gray levels are represented according to the following table:
| Bit 1 | Bit 0 | Gray Level |
|---|---|---|
| 0 | 0 | Black |
| 0 | 1 | Dark Gray |
| 1 | 0 | Light Gray |
| 1 | 1 | White |
Memory for this format can be arranged like this: