how do colours appear on computer ??? colors on screen is not like colors on clothes, papers...?

Answer 1

The colors on Screen are generated from 3 basic colors which are Red, Green, and Blue or RGB.
These are light basic colors and combining them with different amounts will result in the color spectrum (nearly all visible colors)

Each point on the screen is called Pixel (Picture Element) and each pixel consists of RGB, each color of RGB are represented with 1 byte, so 1 byte for RED, 1 Byte for Green and 1 byte for Blue.
1 Byte = 8 bits (the smallest memory element)
so 1 pixel on screen = 24 bits of memory, and here you find the word 24 bit called true colors because it can generate 2 to the power 24
2^24 = 16,777,216 colors.

The Printer colors are paint or dye (pigment) where the basic pigment colors are Red, Blue, and Yellow
the secondary pigment colors are Cyan, Magenta, Yellow which are used on color printers in addition to the Black color.

For the good designer it must be nearly identical in case he chosen the correct colors, settings for screen and printer and Scanner.

Regards,
:)

Answer 2

Colours are produced by combining different amounts of red, green and blue.

The red green and blue come from the phosphors on a CRT or plasma, dye filters on an LCD.

All the colours that you can see can be mapped onto a chart. Typically something called a cie colour chart is used:

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

However, the red green and blue on the monitor are not the redest greenest and bluest available on the chart. If you map them onto the chart you can create the colour gamut - a picture of all the colours that monitor can actually produce:

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

Any colour outside that triangle the monitor can not recreate, but exist in the real world. Even worse, since the monitor maps a real world totally saturated green as the top cornet of its gamut, by the time you move your way down the chart to get to the green the monitor can actually produce, the monitor is mapping that as an even less saturated green!

This is a big problem for the online shops like clothes shops where the colour really matters.

It gets even worse when you print out your image. The printer uses cyan, magenta and yellow inks, which are different colour points again, so the screen looks different from the printout which looks different from the actual object. If you took a digital picture then the colour filters in the camera make it all different again!

Loading the icm files for the monitor and the printer can help a bit, but not very much.

Answer 3

in hexdecimal format. This can depend on the image quality... im not 100% sure but most encounters of these hex references range from #FFFFFF being white and #000000 being black.

Other references i've seen use blue, red, green. Each reference can range from 1-255 to create a color.

Never thought about it really.

Answer 4

Smells like homework.