Image Colour Format Mode

An image can be converted to various 'Modes' each one having it's own purpose.
CMYK – this mode is for conventional printing whereby the image is converted to the four process colours: Cyan, Magenta, Yellow and Black to coincide with the print procedure. Colour intensity is lost due to the limitations of vibrant colours being reached. This is kept to a minimum with colour management and doesn't affect natural imagery so a good end result is always achieved.
RGB – this is the mode in which a digital image starts its life. Red, Green and Blue are colour channels which closely represent the colour receptors of the human eye, this is also how computer screens and image scanners translate colour.
Greyscale – this is when all colour information of an image is converted to one 'channel' commonly known as 'Mono'. This will then be adjusted so maximum contrast and brightness achieved and used as either a 'black & white' image or coloured up as a 'Monotone'. Greyscale or monotone images are often used in life photography and sometimes converted back to CMYK to produce a '4 colour black & white' for depth and clarity.
Duotones, Tritones and Quad tones – these modes are for colouring images to match brand colours, usually one 'special colour' and black are combined to create a Duotone, and if two colours are used in addition to black a Tritone is produced and so on...
Bitmap – this mode is solid line work only used for line illustrations and logos, also cutter guides.

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