Bit Map

Bit Map - In computer imaging, the electronic representation of a page, indicating the position of every possible spot (0 or 1).

• BMP is a standard Windows image format on DOS and Windows-compatible computers. BMP format supports RGB, Indexed Color, Grayscale, and Bitmap color modes. You can specify either Windows or OS/2® format and a bit depth up to 32 bits per channel for the image. For 4‑bit and 8‑bit images using Windows format, you can also specify RLE compression.

References:

• Adobe Help Resource Center: BMP format