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2. Basics of Image Processing / 2.2 Picture Types

### 2.2.3 The Gray Image

A gray image uses - depending on the color depth - 1 or 2 Bytes for every pixel. 1 Byte per pixel results in 8 Bit depths, 2 Bytes in 16 Bit. Therefore, a gray image with 8-Bit-depth offers 256 shades of gray and every pixel can have any of these shades.

A gray image (8 Bit) with a size of 1024 x 1024 pixels occupies 1024 * 1024 Byte- 1 MByte - memory.