dvd-hq.info Forum Index dvd-hq.info
DVD & video forums
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

question about 32-bit color

 
Post new topic   Reply to topic    dvd-hq.info Forum Index -> General
View previous topic :: View next topic  
Author Message
compusic



Joined: 22 Sep 2006
Posts: 35

PostPosted: Tue 24 Apr 2007, 7:22    Post subject: question about 32-bit color Reply with quote

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.
Back to top
View user's profile Send private message
RMN
Site Admin


Joined: 04 Feb 2003
Posts: 587
Location: Lisboa, Portugal

PostPosted: Wed 25 Apr 2007, 1:46    Post subject: Reply with quote

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 +").

RMN
~~~
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic    dvd-hq.info Forum Index -> General All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Powered by phpBB © 2001, 2002 phpBB Group