Types Of Bitmap Header

There are six important type of file header which are given below:-

1)BITMAPFILEHEADER:-It has the first 14 bytes of any bitmap header.It has the following structure:-


struct bitmapHeader
   {
   char identity[2];//2bytes
            unsigned int sizeOfBmp,//4 bytes

            short int reserved,//2 bytes
 reserved1;//2 bytes
    unsigned int Startingadd;//4 bytes
}
This is the structure for the BITMAPFILEHEADER.In this structure identity is the char array which stores header field which is used to identify the bmp.Possible values are BM,BA,CI etc.Unsigned int sizeOfBmp shows the size of bmp file.Short int reserved & reserved1 are reserved value which actually depends upon  application that creates image.The last 4 bytes shows starting address of image data.

2)BITMAPCOREHEADER:-Its structure has five members


struct bitmapCoreHeader
   {
    unsigned int sizeOfDib,//4 bytes
                               widthinPixels,//4 bytes
                               heightinPixels;//4bytes
  short int noOfColorPlanes,//2 bytes
       BitsPerPixel;//2 bytes
}

It has some important information like width & height of BMP in pixels & bitdepth of bmp.

3) BITMAPINFOHEADER:-Its structure has 11 members.It is standard DIB header which we normally use in BMP file.It has total size of 40 bytes.


struct bitmapInfoHeader
   {
    unsigned int sizeOfDib,//4 bytes
                               widthinPixels,//4 bytes
                               heightinPixels;//4bytes
  short int noOfColorPlanes,//2 bytes
       BitsPerPixel;//2 bytes
           unsigned int compressionMethod,//4 bytes
                              imageSize,//4 bytes
                             horRes,//4 bytes
                             verRes,//4 bytes
                             noOfColorsInColorPalatte,//4 bytes
                            noOfImportantColorUsed;//4 bytes
}

It have some specific information like compression method used,horizontal & vertical resolution etc.

4)BITMAPV4HEADER:It has following structure:-

typedef struct {
  unsigned int bV4Size,//4 bytes
               bV4Width,//4 bytes
               bV4Height;// 4 bytes
  short int bV4Planes,//2 bytes
            bV4BitCount;//2 bytes
  unsigned int bV4V4Compression,//4 bytes
               bV4SizeImage,//4 bytes
               bV4XPelsPerMeter,//4 bytes
               bV4YPelsPerMeter,//4 bytes
               bV4ClrUsed,//4 bytes
               bV4ClrImportant,//4 bytes
               bV4RedMask,//4 bytes
               bV4GreenMask,//4 bytes
               bV4BlueMask,//4 bytes
               bV4AlphaMask,//4 bytes
               bV4CSType;//4 bytes
  CIEXYZTRIPLE bV4Endpoints;//36 bytes
  unsigned int bV4GammaRed,//4 bytes

               bV4GammaGreen,//4 bytes
               bV4GammaBlue;// 4 bytes
} BITMAPV4HEADER, *PBITMAPV4HEADER;

It has  Red,Green ,Blue & Alpha mask.4bytes for color space type.It also Gamma for all three RGB values

5))BITMAPV4HEADER:-It is the extended version of BITMAPINFOHEADER.It has following structure:-

typedef struct {
  unsigned int bV5Size,//4 bytes
               bV5Width,//4 bytes
               bV5Height;// 4 bytes
  short int bV5Planes,//2 bytes
            bV5BitCount;//2 bytes
  unsigned int bV5V4Compression,//4 bytes
               bV5SizeImage,//4 bytes
               bV5XPelsPerMeter,//4 bytes
               bV5YPelsPerMeter,//4 bytes
               bV5ClrUsed,//4 bytes
               bV5ClrImportant,//4 bytes
               bV5RedMask,//4 bytes
               bV5GreenMask,//4 bytes
               bV5BlueMask,//4 bytes
               bV5AlphaMask,//4 bytes
               bV5CSType;//4 bytes
  CIEXYZTRIPLE bV5Endpoints;//36 bytes
  unsigned int bV5GammaRed,//4 bytes

               bV5GammaGreen,//4 bytes
               bV5GammaBlue,// 4 bytes

               bV5Intent,// 4 bytes

               bV5ProfileData,// 4 bytes

              bV5ProfileSize,// 4 bytes
              bV5Reserved;// 4 bytes
} BITMAPV5HEADER, *PBITMAPV5HEADER;