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16 and 32bit on lcds/tfts

Discussion in 'Monitors' started by Phil2008, 22 May 2006.

  1. Phil2008

    Sgarrista

    Joined: 17 Dec 2004

    Posts: 8,489

    All lcd and tft monitors are 16bit colour, so why does videos/dvds look better in 32bit colour?
     
  2. Phil2008

    Sgarrista

    Joined: 17 Dec 2004

    Posts: 8,489

    16-bit and 32-bit shouldnt look any difference if the lcd is only 16-bit colour surely? 16-bit is 16.7 Million Colours right? :confused:
     
  3. MadMatty

    Wise Guy

    Joined: 14 Jan 2005

    Posts: 1,521

    Location: Lincoln, UK

    15/16 bit is measured in thousands of colours. 24/32 bit is Millions of colours, thats why 32bit looks best and theres no reason to use anything less on todays pcs ;)
     
  4. Zefan

    Don

    Joined: 15 Jan 2006

    Posts: 31,226

    Location: Tosche Station

    Who told you tft's only display 16 bit? You've been BS'd mate.

    Just for the record

    16 bit = 65,536 colours
    32 bit = 4,294,967,296

    Well, at least that's how it should be.
     
    Last edited: 23 May 2006
  5. MrFunex

    Wise Guy

    Joined: 17 Oct 2005

    Posts: 1,145

    Location: Southampton

    Quite an informative (if a little dry) article:

    Here

    Read "the colour depth issue", about 1/3 way down. Should clear everything up!
     
  6. kleox64

    Gangster

    Joined: 28 Jul 2005

    Posts: 403

    its 24bit + 8bit, the 8-bit being the available greys hence 32-bit.

    technicaly speeking its 16.7 million collours, the rest is greys.

    A 10-bit implementation isnt viable at the consumer level, it would achieve 30-bit colour plus another 10-bits for the greys.
     
    Last edited: 23 May 2006
  7. Phil2008

    Sgarrista

    Joined: 17 Dec 2004

    Posts: 8,489

    Look at the lcd specs at overclockers, They all say 16.2 million colours. I would of thought 32bit is 32 million colours?
     
  8. mosfet

    Wise Guy

    Joined: 28 Sep 2004

    Posts: 1,151

    Location: London

    To work out the number of colours available for a given bit-per-pixel count, raise 2 to the power of bitdepth.

    16bits = 2^16: 65,536 colours
    24bits = 2^24: 16,777,216 colours (16.7 million)
    32bits = 24bits with 8bits of alpha channel information (256 levels).
     
  9. kleox64

    Gangster

    Joined: 28 Jul 2005

    Posts: 403

    the 16.2M I dont understand, I think its because the panels are using 6-bit LCD which dither to 16.2M colours. I dont know about you but anything less than 8-bit will have banding no matter how good the panel is.
     
  10. Baddass

    Capodecina

    Joined: 12 Jan 2003

    Posts: 20,184

    Location: UK

    to help with all the terminology on TFT's:

    24bit = 8 bit = 16.7 million colours
    18bit with dithering = 6 bit = 16.2 million colours
    18bit = 6 bit = 262,144 colours