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The GIMP Paintbrush File Format Version 2 (.gbr)

The GIMP 8-bit brush format spec, kindly provided by David Neary

HEADER

• Bytes 0 - 3: header_size:
  Type: 32 bit unsigned int
  Value: size of brush header (28) + length of brush name
  
• Bytes 4 - 7: version
  Type: 32 bit unsigned int
  Value: The file format version. Currently
  
• Bytes 8 - 11: width
  Type: 32 bit unsigned int
  Value: Brush width
  
• Bytes 12 - 15: height
  Type: 32 bit unsigned int
  Value: Brush height
  
• Bytes 16 - 19: bytes
  Type: 32 bit unsigned int
  Value: Colour depth of brush.
  1 = greyscale, 4 = RGBA
  
• Bytes 20 - 23: magic_number
  Type: 32 bit unsigned int
  Value: GIMP brush magic number.
  ('G' << 24) + ('I' << 16) + ('M' << 8) + 'P'
  
• Bytes 24 - 27: spacing
  Type: 32 bit unsigned int
  Value: Default spacing to be used for brush. Percentage of brush width.
  
• Bytes 28 - (header_size - 28):
  Type: char *
  Value: UTF-8 string - name of brush

BODY

• Size: width * height * bytes
  Type: uchar *
  Value: Pixel values (row-first) for brush