Software Workshop 1 | Part 2

Digital Colour Modes

• CMYK - subtractive colour, ink on paper
• RGB - additive colour, light via monitor, projector, etc

• Channels palette - how photoshop stores information on an image's colour. 

1. cyan and yellow | cyan + magenta

• If we were to consider screenprinting in CMYK, for example one screen cyan, one screen yellow...the black and white image can act as a positive for printing.

• Process of colour separation - separating an image into positives of four colours, one for each ink (C, M, Y, K). 

• Save image as TIFF. Then open image in illustrator. Use illustrator to print the document after separating the channels.

• After placing image in illustrator, go to print, set size and dpi. Then go to output, change mode to 'Separations (Host-Based), now more information is visible. You can print the different colour channels, creating a single positive for each of the process colours.

Printing Tints

• Printing tints of a colour using halftones. A black and white gradient is transformed into a grid of dots. The spacing of the dots dictates the tint/shade of the colour.