PCX Header Format

PCX files begin with a 128-byte header:

offset

size

description

0

1

manufacturer byte, must be 10 decimal

1

1

PCX version number

0 = PC Paintbrush version 2.5

2 = PC Paintbrush 2.8 with palette information

3 = PC Paintbrush 2.8 without palette information

4 = PC Paintbrush for Windows

5 = PC Paintbrush 3.0 or later, PC Paintbrush Plus

2

1

run length encoding byte, must be 1

3

1

number of bits per pixel per bit plane

4

8

image limits in pixels: Xmin, Ymin, Xmax, Ymax

12

2

horizontal dots per inch when printed (unreliable)

14

2

vertical dots per inch when printed (unreliable)

16

48

16-color palette (16 RGB triples between 0-255)

64

1

reserved, must be zero

65

1

number of bit planes

66

2

video memory bytes per image row

68

2

16-color palette interpretation (unreliable)

0 = color or b&w, 1 = grayscale

70

2

horizontal screen resolution - 1 (unreliable)

72

2

vertical screen resolution - 1 (unreliable)

74

54

reserved, must be zero

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copyright 2001 Ted Gruber Software, Inc.