Posted: Tue 24 Apr 2007, 7:22 Post subject: question about 32-bit color
It seems "32-bit color depth" is used to refer to different color depth, very confusing. can someone make it clear?
well, I just give some examples I have encountered.
for crt or lcd display, 32-bit means 24-bit RGB and the extra 8-bit is for transparence, right?
and some softwares process video data in 10-bit resolution for each channel, and this is also called by someone as 32-bit color, though only 30-bit is used, and the eatra 2-bit may or may not be used for transparence.
some file format allows 32-bit color for each channel, and the total depth without transparence is 96-bit.
but some NLE softwares have 32-bit color option for export or render, and don't tell whether it's 10-bit or 8-bit for each channel, such as Premiere.
Joined: 04 Feb 2003 Posts: 587 Location: Lisboa, Portugal
Posted: Wed 25 Apr 2007, 1:46 Post subject:
32-bit colour always refers to 8-bpc (bits per channel) modes, with 4 channels (ex. CMYK or RGBA). In graphics cards, the 32-bit mode is actually a 24-bit mode (monitors can't make the pixels transparent, so the transparency info is ignored, except for compositing - ex., textures in 3D games, etc.).
Modes with more bits per channel are usually described as 10-bpc, 12-bpc, etc., but sometimes they are also described by the total number of bits (ex., 30-bpp). There is no 10+10+10+2 mode.
32-bpc modes are usually floating-point, and not used for video (they are used for 3D rendering, especially when working in HDR). Generally video is processed at 8 or 16 bpc internally (it can be processed in FP32, but there's no real advantage, and it's much slower).
The 32-bpp mode for video files refers to RGBA (sometimes also described as "millions of colors +").
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