Growing up in a print shop gives me a unique knowledge of all things print. Stray too far outside of the spot color domain however and I have to start getting resourceful.
My family’s business has always used offset presses. And even while they have T-heads to enable the simultaneous printing of 2 colors — the ink has always been Pantone spot colors. This means that whatever we designed, be it on the old negative-creating typesetter circa 1980 or Adobe InDesign, would come out black-and-white in the end to be “converted” to a single spot color on the presses. [Aside: I’m not even going to get into the use of halftone screens and the camera in order to make printable photos — lets just gloss all over that and say it all ended up in black and white.] At no time did I ever need to delve into the process color domain. I knew it existed, I grok the basic concepts, but I didn’t have to concern myself with it.
Recently Benjamin was designing a banner in Inkscape that was to be printed by a 3rd party vendor who specifically requested the document be in CMYK. I dug around and discovered that while Inkscape has some tentative support for CMYK, it is unable to export EPS files in that color space. The work-around is to import the SVG file into Scribus and create the EPS from there as Scribus has better color management support. The tricky part is that Benjamin had used three high-resolution JPEGs in the SVG — JPEGs that were in the sRGB color space. I attempted to use jpegicc utility from littlecms to convert the image from the sRGB color space to a CMYK color space using an Adobe ICC file which succeeded. However, viewing these images did not give me a comfortable feeling that they would look good in print. I ended up punting the work altogether and asked a friend to use Adobe PhotoShop to do the conversion. I was then able to do the Inkscape -> Scribus route to get the final EPS format.
The banner was reported shipped yesterday. Hopefully my color space wrangling worked and it’ll look good upon arrival.