Colour Models - RGB, CMYK, HSB & LAB
RGB – Red, Green & Blue
RGB stands for Red Green and Blue. This model represents how your computer sees colours. Easiest way to understand RGB model is by understanding Light theory. RGB in full intensity of each of its shade (Ranging from 0-255) as in when R,G and B are 255 each produce White colour and when all are Zero, produce zero light as in Black colour. The power of RGB to display rich colours on your computer screen is because of the fact that with various permutation and combination of each colour shades of R,G,B raning from (0-255) it can create 16.7 Million colours.
CYMK – Cyan, Magenta, Yellow and Black
CMYK stands for Cyan Yellow Magenta and black. This colour model is used for printing. This colour model is exactly the opposite of RGB and with full intensity of CMYK (as in 100% of each) the colour produced is black and with zero of each shade the colour produced is white. Originally, this colour model was only made of CMY, but because of small impurities found across all CMY inks, the colour “K” as in black was added to make the muddy brown colour of CMY to a pure black. Make sure, when you are printing, your file is CMYK or what you see on your computer screen might not be what exactly gets printed as screen colours are RGB which produces lot more colours than CMYK.
HSB: Hue, Saturation & Brightness
HSB stands for Hue, Saturation and Brightness. Here Colour is represented by three numbers. The first number is hue and its value ranges from 0 to 360 degrees. Each degree represent a distinct color. The second number is saturation. It represents the percentage of or the intensity of a particular color. Its value ranges from 0 to 100 as in, in percentage. The third number is brightness.Increasing brightness or decreasing it causes the addition of black and white to the image colour.
LAB stands for Luminance (or lightness) and A and B are chromatic components. According to this model A ranges from green to red and B ranges from blue to yellow. Broadcast TV shows etc use this colour so that irrespective of the device or TV at home, they all display the same colours on every screen. In simple words, LAB are device independent colour models.
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