BMP Image

BMP

• Format Type : Image
  
• Endian Order : Little Endian
  

Format Specifications

// BMP file format (image)

// little endian

// header
2 bytes (char) - magic // "BM"
4 bytes (uint32) - size of the BMP file
4 bytes - reserved
4 bytes (uint32) - offset of image data

// DIB header --> Info header (40 bytes) OR Core header (12 bytes) etc.
// See more details in notes below.

// Info header
4 bytes (uint32) - size of info header
4 bytes (uint32) - bitmap width in pixels
4 bytes (uint32) - bitmap height in pixels
2 bytes (uint16) - number of color planes   // must be "1"
2 bytes (uint16) - number of bits per pixel // "1" - monochrome pelette, num_colors=1
                                            // "4" - 4bit palettized, num_colors=16
                                            // "8" - 8bit palettized, num_colors=256
                                            // "16" - 16bit RGB, num_colors=65536
                                            // "24" - 24bit RGB, num_colors=16M
                                            // "32" - 32bit RGB
2 bytes (uint16) - compression type  // "0" - BI_RGB, no compression
                                     // "1" - BI_RLE8, 8bit RLE encoding
                                     // "2" - BI_RLE4, 4bit RLE encoding
                                     // "3" - BI_BITFIELDS, Huffman 1D 
                                     // "4" - BI_JPEG, RLE-24
                                     // "5" - BI_PNG 
                                     // "6" - BI_ALPHABITFIELDS 
                                     // "11" - BI_CMYK 
                                     // "12" - BI_CMYKRLE8 
                                     // "13" - BI_CMYKRLE4 
4 bytes (uint32) - compressed image size   // can be 0 if compression=0
4 bytes (int32) - horizontal resolution (pixels per metre)
4 bytes (int32) - vertical resolution (pixels per metre)
4 bytes (uint32) - number of colors in palette
4 bytes (uint32) - number of important colors  // 0=all colors 
                                               // ignored in most cases

// bit masks (optional)   
x bytes - extra bit masks   // occurs only for "3" and "6" 
                            // bitfields compression types

// color table / palette (optional)
x bytes - palette data

// pixel array
x bytes - image data

MultiEx BMS Script

Not written yet.

Notes and Comments

• Generic Bitmap *.bmp Image.
• There are different kinds of DIB headers available in this format:
  BITMAPCOREHEADER (12 bytes)
  OS22XBITMAPHEADER (64 bytes)
  OS22XBITMAPHEADER (16 bytes)
  BITMAPINFOHEADER (40 bytes)
  BITMAPV2INFOHEADER (52 bytes)
  BITMAPV3INFOHEADER (65 bytes)
  BITMAPV4HEADER (108 bytes)
  BITMAPV5HEADER (124 bytes)
  but the most common ones are BITMAPCOREHEADER and BITMAPINFOHEADER used mostly in Windows applications.

Games

List of games using this file format:

• High Heat Baseball 2000
• Killer Tank
• SpongeBob SquarePants: Operation Krabby Patty
• Giana’s Return
• Many more...

Compatible Programs

• Game Extractor
  
• GIMP
• Adobe Photoshop
• MS Paint
• Paint.NET
• IrfanView