Advanced Preparation of positives for screen printing - Part 1

- When designing consider over printing (merging colours together)  and knocking out (keeping the colours separate)

- When preparing your positives consider halftones - (image made up of a grid of black dots rather than grey tones )

Must consider: 

Frequency 
- measured in lines per inch

Angle (to avoid Moiré patterns)
- for one ink = 15 degrees

Printing process:

- Must use a black and white laser printer
- Check output option - mode should be on separations 15 degrees

When using digital print use bitmap technique for A2 size in order to halftone (must be a grey scale image)

To experiment with shape of halftones you MUST bitmap your image

CMYK  for 'print' overprinted in order to print colour
ink on paper
Subtractive

Frequency 
- measured in liner per inch (50lpi max)

Angels - for four inks (15,  75, 105, 155 degree )

The other kind of ink is 'spot' ink

Pantone colours are a spot colour reference system used in the commercial print industry

- They allow the accurate reproduction of colour - used in branding
- It can be cheaper - fewer inks makes production less expensive