Watch this Space!

Colour space

CMYK

CMYK is one of the most standard colour models used in offset printing for full colour documents when printing and using software. It is short for Cyan, Magenta, Yellow and Black. Below is the image shows CMYK and what the colours look like. It is a colour mode which all colour get described as a mixture of these four process colours. Almost every printer or any type of printer used CMYK and it’s often called four-colour printing. It is different from RGB because it subtracts colours from the computer screen of the image you are creating. If you were to add equal amounts of cyan, magenta and yellow they should product the colour black. However, pure black is difficult to create by blending the colours together because of the impurities in the inks. This is why the black (K) ink gets included with the three other colours CMY and it is used to avoid confusion with the black in RGB!

RGB

 

The second image is RGB which means Red, Green, and Blue. Display devices use this type of colour code. The most difficult aspect of desktop publishing in colour is looking at colour matches so converting the RGB colours into the CMYK colours when it gets printed it looks the same as the images which appears on the screen. It is used for creating images on the computer screen where as CMYK colours are subtracted. This actually means that the colours get a lot darker as your blend them all together. RGB colours actually get used for light and not for pigments and the colours that you have blended get a lot brighter or it can increase their intensity!

Grey Scale

The image below showing different shades of grey is called grey scale. Grey scale is different shades of grey without an apparent colour. The darkest shade is black which means it is a total absence of transmitted or reflected colour. However, the lightest colour is white and the total transmission or reflection of light at all visible wavelengths. The shades of grey represent the equal brightness level of the three primary colours which are Red, Green and Blue (RGB) for transmitted light or equal amounts are the three primary pigments Cyan, Magenta and Yellow (CYMK) for reflected light.

YUV

YUV (luminance and chrominance) colour space is unusual because the Y component 

determines the brightness of the colour which gets referred to as luminance or luma and the U and V components determines the colour itself so that would be the chroma. Y usually ranges from 0 to 1 or in digital formats 0 to 225 while the U and the V range from -.05 to 0.5 again in digital terms from -128 to 127 or possibly 0 to 255 in an unsigned form. You can get a grey scale image by taking out the U and V components. There are other colour spaces which have similar properties but the main reasonable to implement or investigate properties of YUV would be to interface with an digital TV or even an analogy TV or even possibly photographic equipment that conforms to certain YUV standard. 

HSV

HSV means hue, saturation and value and they are based on the artist concepts of tint, shade and tone. Its colour space is a cylinder and not a cone as they are usually pictured! However the perceived change in colour as saturation varies between 0 and 1 is less for dark colour. For example ones with a low value parameter than for light ones for example with a high value parameter. Colour space is usually seen as a distorted form of a cone to help compensate for the perception imbalance which although the space is still not perceptually uniform. The RGB the HSV colour space is a device dependent type of colour space which actually means the colour your eyes see on your computer screen depends on the actual screen type you are using and what its settings are under. The complementary colour in the hexcone is around 180 degrees opposite on another