screen printing > Separations

Spot Color Seps with Photoshop Channels

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starchild:
Hi everybody!

I was going through my routine search and discovery on the googles
and came across this 3 part separation tutorial series.
http://www.cedarboxcreative.com/color-seps-with-photoshop-channels-part-2

It's basically using the CMYK channels (after duplicating the image and then converting to CMYK) against each other to knock the colors out.

Thought it would be useful to someone or to contrast to the Jimmyo's spot color vid where he uses the color range command to select the colors.

jsheridan:
I've found this guy to be the best so far...

http://www.youtube.com/eternyl#p/u

starchild:

--- Quote from: jsheridan on November 27, 2011, 12:32:53 AM ---I've found this guy to be the best so far...

http://www.youtube.com/eternyl#p/u

--- End quote ---


Yeah I actually saved his tutorials to my drive using keepvid.com.
I like the use of the channel mixer window to select out the colors while in monochrome.
However the channel mixer only offers you RGB sliders to manipulate the hues and being that
the colors are being pulled in a gray scale anyway, I find that choosing the Black and White  adjustment command
offers more control over the hues because along with the RGB sliders you also get cyan, magenta and yellow for a higher level of control of the hues.

Dottonedan:
I'm finding that we have even more ways to separate than I first thought.  Every time i yjink ive done it all, someone shows another way. I have done it using Eturnal's method. It is (one) way, but not yet the best. I think to know or learn the best methods, you might need to have the intentions of really improving your outcome. Often times, only those who want to make a living at separations are the ones who go this far. For most, these methods are all you need, especially starting out these options are ideal as they have no cost to them if you already have Photoshop.

starchild:

--- Quote from: Dottonedan on November 27, 2011, 08:43:49 AM ---I think to know or learn the best methods, you might need to have the intentions of really improving your outcome.

--- End quote ---

I really want to  learn or know the best methods and techniques. I'm after the "Why" use a particular procedure in the sep'n process to
achieve a required result. "When" do we use saturation and contrast commands? (levels, curves, vibrance etc.), when used in channels,
are destructive commands because we can't use adjustment layers in channels so we always move forward and can't pull back our edits. "Can we" use layers to build the sep using adjustment layers to retain balance and control of each screen/layer thus making the whole procedure non destructive? What are some of the better ways of selecting hues? I've learned on this board of using the calculations command to knock color out using channels against each other (It's the post with the sep'd phoenix) I only know calculations being used to mask more general areas, I thought the blend modes Add/Subtract was more of a luminescence operation and never considered the hues that can be selected by the various degrees of light blocking.

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