Colour systems.
• CMYK DEFINITION: Stands for "Cyan Magenta Yellow Key Black." These are the four basic colors used for printing color images. Unlike RGB (red, green, blue), which is used for creating images on your computer screen,
• CMYK colors are "subtractive." This means the colors get darker as you blend them together. Since RGB colors are used for light, not pigments, the colors grow brighter as you blend them or increase their intensity.
• SPOT COLOUR Print technicians around the world use the term spot colour to mean any colour generated by a non-standard offset ink; such as metallic, fluorescent, spot varnish, or custom hand-mixed inks. (as opposed to obtaining a colour by via mix of cmyk)
• GREYSCALE One colour black and all the shades of grey through to white (black and white photography is grey scale)
• MONOCHROME (mono)Monochromatic colours are all the colours of a single hue derived from one colour and extended using the shades,tones and tints of that colour.
• HALFTONE This is a mechanical process (as opposed to chemical) for converting tonal values into a series of dots that although solid dots, when printed give the impression of continuous tone
CMYK (cyan/magenta/yellow/key black – 4 colour process) Subtractive.
This is used in the most common printed process called litho or offset litho RGB (red/green/blue – screen based) Additive.
Greyscale (Black and white continuous tone and any shade of grey, such as a black and white photograph)
Duotone (when a continuous tone image is printed in 2 or more spot colours – this term is also generally used when describing tri and quadtones.
Spot colour (one or more specially mixed colours as opposed as a result of a CMYK or RGB mix)
Mono (like greyscale but with a coloured ink, ie: one colour and percentage tints of that colour, plus the colour of the material it’s printed on)
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