# 16 and 32bit on lcds/tfts

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

1. Phil2008

# Posts: 8,489

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

2. Phil2008

# 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?

# 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

# 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

# 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

# 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

# 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

# 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

# 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.

# 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