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The following subtypes define uncompressed RGB formats with no alpha channel. |
49c91c8c-6889-48c6-8fa5-84929c03d951 |
Uncompressed RGB Video Subtypes (Dshow.h) |
reference |
4/26/2023 |
UpdateFrequency5 |
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The following subtypes define uncompressed RGB formats with no alpha channel.
Constant | Description |
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RGB, 1 bit per pixel (bpp), palettized |
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RGB, 4 bpp, palettized |
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RGB, 8 bpp, palettized |
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RGB 555, 16 bpp |
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RGB 565, 16 bpp |
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RGB, 24 bpp |
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RGB, 32 bpp |
The following subtypes define uncompressed RGB formats with alpha channel.
Constant | Description |
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RGB 555 with alpha channel |
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RGB 32 with alpha channel |
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16-bit RGB with alpha channel; 4 bits per channel |
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32-bit RGB with alpha channel; 10 bits per RGB channel plus 2 bits for alpha. |
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32-bit BGR with alpha channel; 10 bits per BGR channel plus 2 bits for alpha. |
For palettized formats, the color of each pixel is specified as an index into a palette. The palette must be included in the format block, following the BITMAPINFOHEADER structure. For non-palettized formats, the color of each pixel is specified directly; the memory layout depends on the bit depth:
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RGB 555 uses the following memory layout:
High-order byte: Low-order byte: X R R R R R G G G G G B B B B B X = Don't care, R = Red, G = Green, B = Blue
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RGB 565 uses the following memory layout:
High-order byte: Low-order byte: R R R R R G G G G G G B B B B B
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For RGB 24, every pixel is an RGBTRIPLE. Each color is one byte, with a value from 0 to 255, inclusive. The memory layout is:
Layout Layout Layout Byte 0 1 2 Value Blue Green Red -
For RGB 32, every pixel is an RGBQUAD. Each color is one byte, with a value from 0 to 255, inclusive. The memory layout is:
Layout Layout Layout Layout Byte 0 1 2 3 Value Blue Green Red Alpha or Don't Care If the subtype is MEDIASUBTYPE_ARGB32, byte 3 contains a value for the alpha channel. If the subtype is MEDIASUBTYPE_RGB32, byte 3 should be ignored.
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A2R10G10B10 uses the following layout:
Layout Layout Layout Layout Bit 0 - 9 10 - 19 20 - 29 30 - 31 Value Blue Green Red Alpha -
A2B10G10R10 uses the following layout:
Layout Layout Layout Layout Bit 0 - 9 10 - 19 20 - 29 30 - 31 Value Red Green Blue Alpha
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