COLOUR THEORY
Colour Theory creates a basic structure for the use of colour within art and how you can use it to accentuate your art. It can be used to enforce mood, temperature, it can be used to reference other art or to give the work a certain time frame or the texture of how the colour is used can make work seem soft and gentle or hard and shocking.
Warm Colours
Red, Orange, Yellow, Brown
Cold Colours
Blue, Purple, Green
As a general rule, painting with colour usually looks more visually appealing if you use a darker shade of a colour rather than pure black or a lighter shade of a colour instead of white.
RGB VS CMYK
RGB STANDS FOR RED, GREEN AND BLUE.
CMYK STANDS FOR CERULEAN, MAGENTA, YELLOW AND BLACK.
Anything dealing with the web should always be in RGB, whereas printed material should be in CMYK.
The reason behind printing in CMYK is necessary is because back in the printing days, before computers, each colour in CMYK had its own plate, the printed would lay down one color, wait for it to dry and then move onto the next colour and the next, waiting for each to dry.
Printing presses still work on this format excluding offset printers that can use a 'spot' colour which can be added to achieve a specific colour swatch.
However modern printers can also print in RGB now too but the standard is still the same, CMYK on printing needs as the colour will appear different if printed in RGB.
However with RGB, computer monitors give off a colour light known as RGB and have a larger color gamut than printing, which is why a computer can display more colours than a printer can process. Printing deals with absorption and reflection of wavelengths which we percieve as color (CMYK).
Sources
http://www.colormatters.com/color-and-design/basic-color-theory
http://cruxcreative.com/rgb-vs-cmyk-when-to-use-which-and-why/
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