CMYK - colour mode used, when preparing for print
Additional colours created - when printed colours overlap
key colour = black ink.
C,M,B used to create full colour image. key colour to add real depth/shadows.
CMYK - can be reffered to processed colour/
- Spot colour - a pot of ink that is the colour you are going to print.
why are spot colours used?
- can be cheaper. - good for commercial use
- used for branding
- allow the accurate reproduction of colour.
Photoshop
- separating a scanned in illustration.
- make selections - magic wand, - select, similar
- select - colour range (similar to wand - more useful?) - click on colour you want to highlight, fuzziness slider = selecting more or less of that colour
- in selection preview - white matte - get a more accurate preview of selection - using fuzziness slider
press ok - layer- new via copy (cmd j)
- repeat process with other colour. - (select, colour range, image, white matte)
Tip; name layers with chosen colour
layers panel.
- lock button - checked square. - lock the transparent pixels in layer - allows you to fill content of layer without filling the background
edit fill - shift backspace - select black
- also repeat if there is black from the original image - may not be solid black originally.
- then print each layer individually.
photographs are printed in CMKY
two techniques for different sizes
1 - A3 or smaller
(check size of image, and mode - CYMK - image, mode)
- save as - as Tiff / photoshop
channels; in layers bar
(click on individual channel to view separately)
cyan channel - black and white image. where the channel is darker - more cyan ink, light = less cyan ink.
these colour channels are used to create the positives to apply the certain …for printing.
- open in illustrator. black and white selected.
- aim to spearate - click output. - mode - change to separations.
- this results in us printing out 4 separate prints.
advantages of first technique - frequency, 250-
half tone dots for aesthetic effects. -
these are the degrees used for ckmy printing
for two colour - 15% and 75%
for one colour 15%
( catch up from jess's notes`)
mode = composite mode
2 - larger than A3 size
- according to the size of image were working on.
- all work in photoshop - cannot use illustrator to separate colours
- using colour channels.
channels drop down - choose split channels. - if more than one layer need to flatten image for this to work.
- from this photoshop will create one image for each of our colour channels.
- need to
- bit map- image who's pixels are only black or white.
bitmap - image - mode - bitmap
choose a resolution. - work at a higher resolution. 1200
halftone image.
- choice of frequency - between 15 and 55
- angle same - 75degrees
shape - round
- lower frequency of dots means more noticeable dots. higher frequency means higher quality image.
