Software workshop 2

• To visualise and create tonal colour for screenprint: make sure image is in 'grayscale' mode, then use 'Channels' - 'new spot channels', choose a colour at 100% solidity. 
• Paint on colour, changing the tone - black, grey, white - above in colour selection, will change the tonal value of the colour. 
• To make your work into a positive save as a psd. and place into illustrator. Go 'windows' -- 'Seperations preview', turn layers on and off to see what it will look like. 
• Then go 'File print', select 'output' and get rid of Cmyk. 
• You can now set the frequency to determine how big or small (subtle or obvious) your half tone will be: 60lpi producing a really fine one (highest you can go), and 15lpi a really obvious large dot (lowest you can go). 
• You can use photoshop to preview this by copying and pasting the grayscale halftone in channels into a new document. Then go 'mode' -- 'bitmap', the first menu put in '1200 pixels' and then 'halftone screen', the second menu will allow you to change the frequency as you would in illustrator. Once you have figured out what you want, use this frequency when printing out in illustrator to produce the same effect.