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- The image you want to print is seperated into the four colours
needed to print using a computer; CMYK.
- Four different negatives are made. One for each colour.
- A negative is placed onto an aluminium printing plate
which is coated in a light sensitive chemical
- Ultra violet light is shone through the negative onto the printing
plate.
- Where the ultra violet light can pass through the negative the
plate the surface turns 'greasy'.
- This is repeated for each of the 4 negatives using a different
printing plate each time.
- When in the printing machine the 'oily' ink will stick to the
greasey area of the plates.
- Water is used to repel the oily ink where it is not wanted.
- Lithography relies on the principle that oil and water
don't mix.
- Just like the other printing methods each colour added to the
paper one at a time.
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- Lithography is the most popular form of printing at the
moment
- It is an expensive process to setup so is therefore
only used for long production runs
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- Lithography is a high quality printing method capable
of reproducing colour text and pictures on to paper or card.
- Lithography is used to print magazines, CD covers, posters
and concert tickets
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