Spot colours - The colours you want to use ( solid colours ready for screen printing)
CMYK- Mixing colours to create other colours
Colour- colour libraries
Brings you here.
You can then type in the reference number of the pantone colour you want to use and the exact colour comes up.
When using spot colours in photoshop they may be printed with CMYK so not a perfect spot colour. In order to create precast spot colours ready to screen print, this is the process used…
Spot colour channels in photoshop...
Channels can also be used to identify spot colours. Adding colour to a black (grey scale) line drawing. The drop down bar in the corner of the channels box, select new spot channel.
Choose a colour that represents the colour were going to work with (ink were going to print with)
Then name the spot colour channel.
Using the word 'spot' means channels are uniquely identified.
Ink will be applied where it appears black, nowhere else, as shown below.
'D'-takes you to black. (foreground colour)
Black applies the colour
White Removes the colour.
It looks orange on the screen, but when grey channel is removed its black which means its ready for screen print as its a positive image.
If you're not sure what colours to use, double click the orange spot and change the colour. Good for experimenting.
With cmyk on
Without it on, so what its going to look like when only spot colours are used.
So what it will look like when screen printing.
When saving make sure spot colours is selected. Must be a tiff or psd.
Then open in illustrator. Place the saved image onto the page.
There will be 7 colour channels displaying at once. At this point we need to check its all ok. To do this we need to go to window-seperation preview.
Turn on by pressing over print preview option. Turn off CMYK and thats what the image will look like.
Then to print. Make sure black and white printer is selected.
Go to output options.
Mode-seperations (host-based)
Turn off cmyk to print.
This one is solid ink to no need to pat attention to halftones.
Now using half tones...
Different shades of black and grey will give different tints of a certain colour. When working with greys, try and match it with the tint you are wanting.
Start the same as before by selecting spot colours etc but this time selecting the light colour first. Choose a shade of grey in the foreground colour. Do the same again for the darker shade, but this
time fill with black but on the same spot colour. This will create two shades of the same colour. This just means the same colour will produce two different shades when screen printing. Because essentially the lighter grey is a halftone of the darker colour. Save again, take to illustrator and again make sure its all ok like last time.
Because were using tints/halftones we must change the print properties in illustrator like we learn last week. We must change the frequency and the angle (see last weeks session for correct numbers)
Over printing or knocking out
( The way the inks interact with each other during the printing process)
Its possible to use 2 colours but create a third.
Thing we need to figure out is how transparent is the printing ink.
Most of them will be transparent so its possible to be quite clever with this.
The solidity is 0% so showing a transparent effect.
However if the solidity is 100% it would be opaque ink so you wouldn't see anything if it was printed on top.
Must change the order of the layers to see this change.