BMP (Windows) Header Format

Windows BMP files begin with a 54-byte header:

offset

size

description

0

2

signature, must be 4D42 hex

2

4

size of BMP file in bytes (unreliable)

6

2

reserved, must be zero

8

2

reserved, must be zero

10

4

offset to start of image data in bytes

14

4

size of BITMAPINFOHEADER structure, must be 40

18

4

image width in pixels

22

4

image height in pixels

26

2

number of planes in the image, must be 1

28

2

number of bits per pixel (1, 4, 8, or 24)

30

4

compression type (0=none, 1=RLE-8, 2=RLE-4)

34

4

size of image data in bytes (including padding)

38

4

horizontal resolution in pixels per meter (unreliable)

42

4

vertical resolution in pixels per meter (unreliable)

46

4

number of colors in image, or zero

50

4

number of important colors, or zero

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copyright 2001 Ted Gruber Software, Inc.