That’s very well said Anne-Marie and a lot of people fall into that trap when making PDFs. It could be more convenient in a CMYK workflow that on exporting to PDF that you choose “Convert to Destination (preserve numbers)” so that any colour that you’ve created in InDesign isn’t converted to the Destination, i.e., only placed images are affected by the Destination.
Another option is to use your grayscale artwork as an opacity mask on a solid spot color base: Group all your artwork and duplicate the group. Set the bottom (as in layer order) group to a solid fill of your chosen spot color.
CMYK and RGB: An Introduction. RGB is the color of physics and of your computer monitors. It is additive color. In this system, red plus green plus blue give you white. This is how your monitor works. If all three elements of a pixel are at their maximum value, you see white. Black is the total absence of color. CMYK is the color of traditional
7. Select the shapes. Object > Rasterize. Shift-click with Eyedropper Tool. Note color (write the numbers down) Edit > Undo Eyedropper (this is why you need to write down the color) Edit > Undo Rasterize. Another way is to simply duplicate the objects, rasterize, shift-Eyedropper, then delete the duplicates.
*rgb Images placed into Illustrator will remain rgb when you save as a pdf (and do not convert to a color destination), even if the Illustrator file uses the cmyk document color mode. You can use the Output Preview tool in Acrobat to identify rgb and cmyk elements in your pdf.
You can convert an image directly from RGB to grayscale, but you also can try using a specific channel. Imagine this photo: A blue sky as a background with a tree with red leaves as your main subject. If you want to print that on blue ink you could use an opposite channel to the blue channel.
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how to convert cmyk into rgb in illustrator
