About BITMAPINFOHEADER class

[Himanshu40]

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[Ank1taS]

The BITMAPINFOHEADER structure contains information about BMP images i.e the dimensions and color format of a device-independent bitmap (DIB). Refer to Microsoft documentation and File format

Syntax

struct tagBITMAPINFOHEADER {
  DWORD biSize;
  LONG  biWidth;
  LONG  biHeight;
  WORD  biPlanes;
  WORD  biBitCount;
  DWORD biCompression;
  DWORD biSizeImage;
  LONG  biXPelsPerMeter;
  LONG  biYPelsPerMeter;
  DWORD biClrUsed;
  DWORD biClrImportant;
} ;

• size of BITMAPINFOHEADER 40-bytes and contains a total of 11 variables as follow

Variable	Field Name	Size in bytes	Description	Reference
biSize	HeaderSize	4 bytes	An integer (unsigned) representing the size of the header in bytes. It should be '40' in decimal to represent the BITMAPINFOHEADER header type.	this
biWidth	ImageWidth	4 bytes	An integer (signed) representing the width of the final image in pixels.	this
biHeight	ImageHeight	4 bytes	An integer (signed) representing the height of the final image in pixels.	this
biPlanes	Planes	2 bytes	An integer (unsigned) representing the number of color planes of the target device. Should be '1' in decimal.	this and this
biBitCount	BitsPerPixel	2 bytes	An integer (unsigned) representing the number of bits a pixel takes to represent a color.	this
biCompression	Compression	4 bytes	An integer (unsigned) representing the value of compression to use. Should be '0' in decimal to represent no-compression (BI_RGB).	this
biSizeImage	ImageSize	4 bytes	An integer (unsigned) representing the final size of the compressed image. Should be '0' in decimal when no compression algorithm is used.	this
biXPelsPerMeter	XpixelsPerMeter	4 bytes	An integer (signed) representing the horizontal resolution of the target device. This parameter will be adjusted by the image processing application but should be set to '0' in decimal to indicate no preference.	this
biYPelsPerMeter	YpixelsPerMeter	4 bytes	An integer (signed) representing the vertical resolution of the target device (same as the above).	this
biClrUsed	TotalColors	4 bytes	An integer (unsigned) representing the number of colors in the color pallet (size of the color pallet or color table). If this is set to '0' in decimal:- 2^BitsPerPixel colors are used.	this
biClrImportant	ImportantColors	4 bytes	An integer (unsigned) representing the number of important colors. Generally ignored by setting '0' decimal value.	this