Editing BMP file format (section)

=== RGB video subtypes ===
The BITFIELD mechanism described above allows for the definition of tens of thousands of different pixel formats, however only several of them are used in practice,<ref name="PSformats2"/> all palettized formats RGB8, RGB4, and RGB1 (marked in yellow in the table above, defined in <code>dshow.h</code>.MEDIASUBTYPE names):

{| class="wikitable" style="float:left"
|+ Uncompressed RGB Video Subtypes<ref name="dshow">{{cite web|url=http://msdn.microsoft.com/en-us/library/windows/desktop/dd407253(v=vs.85).aspx|title=Uncompressed RGB Video Subtypes|publisher=[[MSDN]]|work=dshow.h|access-date=2014-03-11}}</ref>
!R.G.B.A.X
!RGB subtype
!R.G.B.A.X
!ARGB subtype
|-
| 8.8.8.0.8
| RGB32
| 8.8.8.8.0
| ARGB32
|-
|
|
| 10.10.10.2.0
| A2R10G10B10
|-
| 8.8.8.0.0
| RGB24
| 10.10.10.2.0
| A2B10G10R10
|-
| 5.6.5.0.0
| RGB565
| 4.4.4.4.0 
| ARGB4444
|-
| 5.5.5.0.1
| RGB555
| 5.5.5.1.0
| ARGB1555
|}

{| class="wikitable" style="float:right"
|+ Bit fields for ten RGB bits<ref name="dshow" />
!Bit field
!Offset
(hex)
!colspan="3"|<span style="float:right">Bits</span> A2R10G10B10
!colspan="3"|<span style="float:right">Bits</span> A2B10G10R10
|-
|Red
|36
|style="color:blue"|<code>00 00 F0 3F</code> 
|<abbr title="little-endian">LE:</abbr> <code>3FF00000</code>
|<code>20</code>...<code>29</code> 
|style="color:red" |<code>FF 03 00 00</code> 
|<abbr title="little-endian">LE:</abbr> <code>000003FF</code>
|<code>&nbsp;0</code>...<code>&nbsp;9</code> 
|-
|Green
|3A
|<code>00 FC 0F 00</code> 
|<abbr title="little-endian">LE:</abbr> <code>000FFC00</code>
|<code>10</code>...<code>19</code>
|<code>00 FC 0F 00</code> 
|<abbr title="little-endian">LE:</abbr> <code>000FFC00</code>
|<code>10</code>...<code>19</code> 
|-
|Blue
|3E
|style="color:red" |<code>FF 03 00 00</code> 
|<abbr title="little-endian">LE:</abbr> <code>000003FF</code>
|<code>&nbsp;0</code>...<code>&nbsp;9</code> 
|style="color:blue"|<code>00 00 F0 3F</code> 
|<abbr title="little-endian">LE:</abbr> <code>3FF00000</code>
|<code>20</code>...<code>29</code> 
|-
|Alpha
|42
|<code>00 00 00 C0</code> 
|<abbr title="little-endian">LE:</abbr> <code>C0000000</code>
|<code>30</code>...<code>31</code> 
|<code>00 00 00 C0</code> 
|<abbr title="little-endian">LE:</abbr> <code>C0000000</code>
|<code>30</code>...<code>31</code> 
|}{{Clear}}

In version 2.1.4 [[FFmpeg]] supported (in its own terminology) the BMP pixel formats ''bgra, bgr24, rgb565le, rgb555le, rgb444le, rgb8, bgr8, rgb4_byte, bgr4_byte, gray, pal8,'' and ''monob''; i.e., ''bgra'' was the only supported pixel format with transparency.<ref>{{cite web|url=http://www.ffmpeg.org/general.html#Image-Formats|title=Image Formats|work=[[FFmpeg]] General Documentation|year=2014|access-date=2014-02-23}}</ref>

[[File:Bmp format.svg|thumb|upright=0.6|[[#Example 1|Example 1]] of a 2×2 pixel bitmap, with 24 bits/pixel encoding]]