MBirkhofer wrote: ...And lock the transparency of the top layer. Your lineart is now on it's own layer and locked.
Multiply does not work for print. As it allows the undercolor to show through completely.
MBirkhofer wrote:Actually, my final layout is a layer with the trap with the 60C40Y40M100K black set to normal(Or whatever %cymk is asked for). Below is the untrapped lineart with 100%k, set to multiply. Then the colorlayer.
I'm not really sure what the formula for multiply or darken are, compared to each other.
Ok, MBirkhofer... I'm not sure which of these statements you meant...you kind of contradict yourself, as I understand it. Also, it sounds like you put the trap on top of the lines? I never though of doing that...hmmm
Anyway, You can use multiply or darken for the lines layer as long as you are using truly aliased artwork. It will function in the same way, although only with 100% values, such as the 100%k line color. If the art is antiliased, I'd recommend multiply, or you'll get color clipping. (As in when coloring pencilled artwork as opposed to inked)
For regular aliased art, I set my layer to darken. I like the way it previews, and I suspect it renders faster, but I'm not certain...
works like this: say you have a green that's 50%c50%y on a darken layer. This will apply the numeric values of those 2 channels (c&y) onto the layers below, affecting any color up to 50%c and 50%y, but on higher values it will leave the areas unaffected. Other channels will also be unaffected.
Meaning over a color like 20%c80%y30%k, 50%c50%y will change the color to 50%c80%y30%k Make sense?
works like this: with that same green (50%c50%y) set on a multiply layer, it will affect the layer below by basically adding it's numeric values, but not at 100% strength. PS uses some messed up algorithm to do this, but I don't know what it is, and I honestly don't feel like figuring it out right now.
I do know that it works on a diminishing curve.
At any rate, multiplying 50%c50%y onto 20%c80%y30%k results in 60%c90%y30%k. This shows that the multiply function affects lower numeric values more than higher ones.
I hope this is more helpful than confusing.