I forgot you meant printing on t-shirts. In normal printing situations (on paper) you use a RIP = Raster Image Processor). It's built-in into a Linotronic and handles all color separations, dot sizes,screen resolution (LPI), overprinting etc to either generate the film sheets or the data for a Direct Imaging system like the Heidelberger DI Quickmaster.
I've read somewhere that you can purchase a software that emulates a RIP for desktop publishing, but I really don't have any additional information about it.
Sure, as far as I know some apps do convert Pantone colors, but usually Pantone colors are used as 'spot' colors for a reduced color set printing process, that means you have 2 Pantone colors which means you have two film sheets in black and white for printing - not a color set. The printer will use just the two Pantone defined color mixtures to apply or print the exact colors. In a 4c process Pantone colors don't make sense, because in this case each Pantone color means an additional film sheet or printing plate.
In the past when the printing process was more expensive many companies used spot colors for their logos, but with todays inexpensive 4c processes the spot colors are somewhat absolete.
A spot color is meant to print without a screen, whereas a 4c process will mix any color out of a range of 16.7 million colors - but the colors will be overprinted with screens of different angles...
So if your task differs from a standard printing process, I can't offer a solution because I don't have enough experience in this particular area.
Thumbs up!
jens g.r. benthien
designer
http://www.sacalobra.de
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