BMP File Format - File Structure - Example 2

Example 2

Following is an example of a 4×2 pixel, 32-bit bitmap with opacity values in the alpha channel (Windows DIB Header BITMAPV4HEADER) with pixel format 8.8.8.8.0 (in RGBAX notation).

Offset Size Hex Value Value Description
BMP Header
0h 2 42 4D "BM" Magic number (unsigned integer 66, 77)
2h 4 9A 00 00 00 154 Bytes Size of the BMP file
6h 2 00 00 Unused Application specific
8h 2 00 00 Unused Application specific
Ah 4 7A 00 00 00 122 bytes from the start of the file Offset where the pixel array (bitmap data) can be found
DIB Header
Eh 4 6C 00 00 00 108 bytes Number of bytes in the DIB header (from this point)
12h 4 04 00 00 00 4 pixels Width of the bitmap in pixels
16h 4 02 00 00 00 2 pixels Height of the bitmap in pixels
1Ah 2 01 00 1 plane Number of color planes being used
1Ch 2 20 00 32 bits Number of bits per pixel
1Eh 4 03 00 00 00 3 BI_BITFIELDS, no pixel array compression used
22h 4 20 00 00 00 32 bytes Size of the raw data in the pixel array (including padding)
26h 4 13 0B 00 00 2,835 pixels/meter Horizontal physical resolution of the image
2Ah 4 13 0B 00 00 2,835 pixels/meter Vertical physical resolution of the image
2Eh 4 00 00 00 00 0 colors Number of colors in the palette
32h 4 00 00 00 00 0 important colors 0 means all colors are important
36h 4 00 00 FF 00 00FF0000 in big-endian Red channel bit mask (valid because BI_BITFIELDS is specified)
3Ah 4 00 FF 00 00 0000FF00 in big-endian Green channel bit mask (valid because BI_BITFIELDS is specified)
3Eh 4 FF 00 00 00 000000FF in big-endian Blue channel bit mask (valid because BI_BITFIELDS is specified)
42h 4 00 00 00 FF FF000000 in big-endian Alpha channel bit mask
46h 4 20 6E 69 57 LCS_WINDOWS_COLOR_SPACE Type of Color Space
4Ah 24h 24* 00...00 CIEXYZTRIPLE Color Space endpoints Unused when LCS_WINDOWS_COLOR_SPACE is specified
6Eh 4 00 00 00 00 0 Red Gamma Unused when LCS_WINDOWS_COLOR_SPACE is specified
72h 4 00 00 00 00 0 Green Gamma Unused when LCS_WINDOWS_COLOR_SPACE is specified
76h 4 00 00 00 00 0 Blue Gamma Unused when LCS_WINDOWS_COLOR_SPACE is specified
Start of the Pixel Array (the bitmap Data)
7Ah 4 FF 00 00 7F 255 0 0 127 Blue (Alpha: 127), Pixel (0,1)
7Eh 4 00 FF 00 7F 0 255 0 127 Green (Alpha: 127), Pixel (1,1)
82h 4 00 00 FF 7F 0 0 255 127 Red (Alpha: 127), Pixel (2,1)
86h 4 FF FF FF 7F 255 255 255 127 White (Alpha: 127), Pixel (3,1)
8Ah 4 FF 00 00 FF 255 0 0 255 Blue (Alpha: 255), Pixel (0,0)
8Eh 4 00 FF 00 FF 0 255 0 255 Green (Alpha: 255), Pixel (1,0)
92h 4 00 00 FF FF 0 0 255 255 Red (Alpha: 255), Pixel (2,0)
96h 4 FF FF FF FF 255 255 255 255 White (Alpha: 255), Pixel (3,0)

Note that the bitmap data starts with the lower left hand corner of the image.

Read more about this topic:  BMP File Format, File Structure

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