Think of channel's in photoshop as ink.
Click channels, drop down menu, new spot channel.
With a channel you can think of it as a layer and do whatever you would do in a layer. Channels act like all layers are in Multiply. By double clicking on the channel you can change the entire colour in the channel very quickly. This is how you can work with over printing! Hazzahh!! You can make a colour deeper by changing the solidity in spot channel options to 100% or varying degrees of it.
Save as PSD of TIFF. Make sure Spot check box is checked. If not, figure out what is wrong.
Layers
Use lock button on layers menu, selects everything but transparent items. Use separate layers for colours to alter all in one go.
To save a JPEG version you must merge all channels otherwise the image will be black and white!
Press D on keyboard to reset foreground and background colours to black and white.
Colour Separations in Illustrator
Open file in Illustrator, place file, window, separations preview, overprint preview. Can then select which ink colour prints.
Printing CMYK in Illustrator - if you have one tinted colour select 15, two select 105, and so on.
15, 75, 105, 155
For screen printing, this only works if you print to a laser printer!
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