Photoshop curves help... puh puh please.

[baker7]

I found it!  Thanks!

[zacgil]

As far as color profiles, you definitely should be using them.  More importantly a specific one throughout the process.  First order of business would be to make sure your plates are linear tho, like Joe said.  Without a linear plate, you won't be able to test the effectiveness of your consitent ICC profiles.  We use "US Web Coated SWOP v2".  However, this is specific to web presses and coated stock.  I would do some research as to what makes sense for whatever substrate you are printing on as well as your printing device.  If you ever have the option, make sure to "Convert" profile rather than "Assign" it.  Assigning will change how that specific breakdown of CMYK is rendered.  Meaning the same breakdown will look different depending on what profile you assign to it.  Converting will keep the "look" of that breakdown the same while changing the specific numbers.  Therefore, through conversion you can keep colors consistent from device to device.