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Sometimes, for artistic or for production purposes, you need to play with the colors in a PDF, you need to convert colors, and that is the job of the Convert Colors Print Production tool. If you're not seeing Print Production tools, go to the Tools Panel menu here, and choose Print Production, because it's not open by default. Let's say that in this page, we want to convert the images to grayscale, but we'd like to keep the spot color down here, because that spot color is used elsewhere.
So instead of printing a five-color job-- the four process colors and the spot color-- we are going to only pay for a two-color job, just grayscale, which is black ink, and the spot color. It would be nice. So how do you that in Acrobat? Just choose Convert Colors. This is kind of like a big, hairy dialog box. But here is a simple way to convert things to grayscale. First, look here under Matching Criteria. If I left this at Any Object, it would convert everything to whichever color profile I choose.
I don't want to convert everything; I just want to convert the images. All right. Or if you just want to convert text, you can choose that. I'm just going to convert the images. So this is keeping track, up here, of what it is you're about to do. So you're going to convert every image, no matter what its color space, to a certain Profile. So Color Type is where it's getting Any Colorspace. You could say only the RGB images do I want to convert, or only the CMYK images do I want to convert, so on. We're going to leave it at Any Colorspace.
Then we want to Convert to Profile. Which Conversion profile do you want? Here is where you need to choose one that is grayscale. The grayscales are down here at the bottom; Gray Gamma 1.8 or 2.2. You can pick and choose between them. One is a little darker than the other. I'll choose 1.8. If you don't like it, you could always revert and try again with the other one. That's basically all you need to do, other than choose which pages. Now, this is just a one-page document, so I'll say All. But if you just wanted to convert certain pages, you could do that here. Then I'll say OK.
Now this one of those things that Adobe can't undo, so all you will be left with will be the ability to revert, or to go back to a last saved version. Keep that in mind. I'm just going to say I would like to proceed. Yes, go ahead, and that's it. It converted all of the images to grayscale, it left my spot color as is, and I may happy camper.
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