BMP Heads

Head

0x00 0x01
42 4D
BM
const

Only BMP file head.

FileSize

0x02   0x05
XX XX XX XX
int

文件大小.

此处及之后 int 型数据均以此方式存储(小端方式):

b=int(i).to_bytes(4,'little')

bfReserved

0x06   0x09
00 00 00 00
const

bfOffBits

0x0a   0x0d
XX XX XX XX
int

偏移量,即文件头总长度. 24位位图 为 54 即 0x36 即

0x0a   0x0d
36 00 00 00
const int

24位位图 Heads

After BMP Heads.

biSize

0x0e   0x11
28 00 00 00
const int

24位位图 Heads 长度,为 40 即 0x28.

biWidth,biHeight

0x12   0x15  0x16   0x19
XX XX XX XX  XX XX XX XX
int          int

宽和高.

biPlanes

0x1a 0x1b
01 00
const

biBitCount

0x1c 0x1d
18 00
const short

像素 bit 数,为 24 即 0x18.

biCompression

0x1e   0x21
00 00 00 00
const int

压缩等级,为 0.

ImageSize

0x22   0x25
XX XX XX XX
int

图片内容大小(像素数 *3B).

Others

0x26                                          0x36
00 00 00 00  00 00 00 00  00 00 00 00  00 00 00 00
const

24位位图 模板

42 4D XX XX  XX XX 00 00  00 00 36 00  00 00 28 00 
      [ FileSize ]
00 00 XX XX  XX XX XX XX  XX XX 01 00  18 00 00 00 
      [  Width   ] [  Height  ]
00 00 XX XX  XX XX 00 00  00 00 00 00  00 00 00 00 
      [ImageSize ]
00 00 00 00  00 00       

Total: 54B=0x36B

e.g. 1280x720

Width=1280=0x0500; Height=720=0x02D0;
ImageSize=1280*720*3=2764800B=0x002A3000;
FileSize=ImageSize+54=2764854B=2.64MB=0x002A3036;

42 4D 36 30 2A 00 00 00  00 00 36 00 00 00 28 00 
      [FileSize ]
00 00 00 05 00 00 D0 02  00 00 01 00 18 00 00 00 
      [  Width  ] [  Height  ]
00 00 00 30 2A 00 00 00  00 00 00 00 00 00 00 00 
      [ImageSize]
00 00 00 00 00 00       

e.g. 1920x1080

Width=1920=0x0780;Height=1080=0x0438;
ImageSize=1920*1080*3=6220800B=0x005EEC00;
FileSize=ImageSize+54=6220854B=5.93MB=0x005EEC36;

42 4D 36 EC 5E 00 00 00  00 00 36 00 00 00 28 00 
      [FileSize ]
00 00 80 07 00 00 38 04  00 00 01 00 18 00 00 00 
      [  Width  ] [  Height  ]
00 00 00 EC 5E 00 00 00  00 00 00 00 00 00 00 00 
      [ImageSize]
00 00 00 00 00 00       

e.g. 2560*1080

Width=2560=0x0A00,Height=1080=0x0438;
ImageSize=2560*1080*3=8294400B=0x007E9000;
FileSize=ImageSize+54=8294454B=7.91MB=0x007E9036;

42 4D 36 90 7E 00 00 00  00 00 36 00 00 00 28 00 
      [FileSize ]
00 00 00 0A 00 00 38 04  00 00 01 00 18 00 00 00 
      [  Width  ] [  Height  ]
00 00 00 90 7E 00 00 00  00 00 00 00 00 00 00 00 
      [ImageSize]
00 00 00 00 00 00       

b'BM6\x90~\x00\x00\x00\x00\x006\x00\x00\x00(\x00'
b'\x00\x00\x00\n\x00\x008\x04\x00\x00\x01\x00\x18\x00\x00\x00'
b'\x00\x00\x00\x90~\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x00\x00\x00'

e.g. 7680x4320

Width=7680=0x1E00,Height=1080=0x10E0;
ImageSize=7680*4320*3=99532800B=0x05EEC000;
FileSize=ImageSize+54=99532854B=94.9MB=0x05EEC036;

42 4D 36 C0 EE 05 00 00  00 00 36 00 00 00 28 00 
      [FileSize ]
00 00 00 1E 00 00 E0 10  00 00 01 00 18 00 00 00 
      [  Width  ] [  Height  ]
00 00 00 C0 EE 05 00 00  00 00 00 00 00 00 00 00 
      [ImageSize]
00 00 00 00 00 00       

b'BM6\xc0\xee\x05\x00\x00\x00\x006\x00\x00\x00(\x00'
b'\x00\x00\x00\x1e\x00\x00\xe0\x10\x00\x00\x01\x00\x18\x00\x00\x00'
b'\x00\x00\x00\xc0\xee\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x00\x00\x00'