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When you're working InDesign by default it shows you low-res proxies of placed graphics, and that's okay, it speeds up performance. You figure things are going just fine when they're printed, but you probably always double check by going to View > Display Performance and High Quality Display. And now you can see he looks a little bit smoother. Now it really looks back at that Photoshop file and paints those pixels to screen. But there is something else going on here, part of what makes this page look so interesting is that there are these blending modes used to make these objects interact with what's underneath.
For instance, if I select this shape and I go to Effects, I can see that the Multiply Blend Mode has been applied to that shape, and that's been applied to all of these interesting shapes. Oh, here is a Color Dodge, and you probably know by now you can start with a simple object and use some of these blending modes and get some really interesting results. But do they present an issue when you go to print. Well there is a forensic tool that I would recommend you use especially when you're using spot colors and you're experimenting with blending modes. If I go to View > Overprint Preview, it's easy to miss, it's the first item in the top of the menu.
Watch what happens to the display of all this content on the page. Wow! That's not what we have in mind and here's the thing. This is really how it would print. I know that's bad news, but you might as well know it now before it goes to press. I am going to use a keyboard shortcut to toggle between having Overprint on and Overprint off. This is how we thought it was going to print this is how it's going to print. Clearly that's not going to work. Why does InDesign lie to us like that? Well, I'm guessing that it's in the interest of increasing performance, but it's a really scary way to work if you really don't know how this thing is going to print.
But I am going to tell you that this circumstance, this disparity between what you think it's going to do and what it's really going to do really only happens when you're using blending modes with spot colors. So I'm going to put this back to the scary Overprint Preview, I am going to go into my Swatches panel and you can see I have all these spot colors. Now if I have my heart set on this being a spot color job I am going to have to find some other effects that will print, but if I don't have to have spot colors there's really an easy way to fix this. I can go to Ink Manager and without having to change all my swatch definitions, I can just convert them to process right here.
When I just click on the little spot flag, it turns into a little CMYK flag or I could've gone down here and checked All Spots to Process. It looks bad now, when I click OK, then it commits to this and it converts all my spot colors to process and now it's all right. It will actually print this way, as long as I am using only process colors. So just kind of remember when you're experimenting, when you're using spot colors, be careful with the blending modes, a lot of them will work just fine, but some of them won't. And if you want to find out the truth before it's too late be sure to remember to turn on Overprint Preview.
If you want you could work with it on all the time but as part of that it turns everything to high-res display. So in a really graphics heavy document that could slow things down, but it would mean you'd know the true story all the way through your job.
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