spjallid.is

Eg var ad lesa a wikipedia ad sumir odyrir skjair feika 24bita litadypt, og eru i raun 18bita med "dither" taekni.

hvernig getur madur vitad hvada skjair eru fake 24bita og hverjir ekki?

LCD displays

* Some cheaper LCD displays use dithered 18-bit color (64 × 64 × 64 = 262,144 combinations) to achieve faster transition times, without sacrificing truecolor display levels entirely.

http://en.wikipedia.org/wiki/Color_depth

Ertu ekki að tala um 6 vs 8 bit ?

http://www.flatpanels.dk/skaerme.php

Geturðu flett upp hvort það er.


Stolið annars staðar frá:
"8-Bit vs. 6-Bit

Now color depth was previous referred to by the total number of colors that the screen can render, but when referring to LCD panels the number of levels that each color can render is used instead. This can make things difficult to understand, but to demonstrate, we will look at the mathematics of it. For example, 24-bit or true color is comprised of three colors each with 8-bits of color. Mathematically, this is represented as:

* 2^8 x 2^8 x 2^8 = 256 x 256 x 256 = 16,777,216

High-speed LCD monitors typically reduce the number of bits for each color to 6 instead of the standard 8. This 6-bit color will generate far fewer colors than 8-bit as we see when we do the math:

* 2^6 x 2^6 x 2^6 = 64 x 64 x 64 = 262,144

This is far fewer than the true color display such that it would be noticeable to the human eye. To get around this problem, the manufacturers employ a technique referred to as dithering. This is an effect where nearby pixels use slightly varying shades or color that trick the human eye into perceiving the desired color even though it isn't truly that color. A color newspaper photo is a good way to see this effect in practice. (In print the effect is called half-tones.) By using this technique, the manufacturers claim to achieve a color depth close to that of the true color displays. "

mind skrifaði:Ertu ekki að tala um 6 vs 8 bit ?

var ad reyna ad islenska ordid

annars etta er rosalegur munur a litunum 18bit skja vantar svona 16.515.072 liti uppa ad vera alvoru 16.777.216 lita eda 98,4375% af heildar litafjolda 24bit skja.