Bitmap Format

Note how to read bitmap data
Reference from http://crazycat1130.pixnet.net/blog/post/1345538

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Overview Bitmap Byte File

bitmap file make up of four parts

• Bitmap File Header
• Bitmap Info Header
• Color Table (Palette)
• Bitmap Array

All words was shown in little-endian mode.

It's mean if value is 0x1234, you will look it display 0x3412.

example shown as a 8X8 pixels all fill red color bitmap file

Bitmap File Header
0000h - 0001h : Identifier  ('BM') [1]
0002h - 0005h : File Size (byte)

0006h - 0009h : Reserved

000Ah - 000Dh : Bitmap Data Offset

Example: 

 

 

  

0000	42	Identifier BM 42H=66D='B' , 4DH=77D='M'
0001	4D
0002	F6	because Little-Endian, so writing F6000000H File Size 246 byte F6H=246D Header 54 + Content 192 (8 X 8 X 3) = 246
0003	00
0004	00
0005	00
0006	00	Reserved
0007	00
0008	00
0009	00
000A	36	Bitmap Data Offset 54 byte It's also mean the size of file header
000B	00
000C	00
000D	00

 

Annotations

【１】This field includes verious code for identify type of bitmap：
　　　　'ＢＭ'　－　Windows 3.1x, 95, NT, ...　　　　
        'ＢＡ'　－　OS/2 Bitmap Array　　　　
        'ＣＩ'　－　OS/2 Color Icon　　　　
        'ＣＰ'　－　OS/2 Color Pointer　　　　
        'ＩＣ'　－　OS/2 Icon　　　　
        'ＰＴ'　－　OS/2 Pointer

to be continue...