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InDesign's Effects panel has two very obscure, but powerful checkboxes called Isolate blending and Knock Out Group and most people just ignore these, but it turns out that you can use them for some pretty cool effects, but the key to these checkboxes is that they only apply to groups. So we need a group. Let's jump to page five of this document by pressing Command+J or Ctrl+J on Windows, then five and Enter and I can see that I have got a couple of different groups here of images. I am going to grab this image on top and put it on top of that one, and I will zoom in so we can see these more clearly.
Now this is one group, this is another group, evidenced by the dashed border around it. In this case, I am going to select the top image here and change its blending mode to Overlay and that's a pretty dramatic effect. We can see that it affects both the Cacao Beans image behind it, also this circle pattern behind that. If we select both of these groups and group those together into a single group, now we could use the Isolate Blending feature because again Isolate Blending only works on groups of objects. I have got two different groups grouped together. I turn on Isolate Blending and we can see that it's dramatically different now.
What happened? Well, InDesign isolated the blending of that Overlay blend mode; it isolated that to only other objects inside that group. So that blend mode, that Overlay blend mode, now does not affect any other objects on the page beneath that group, like I can't see those circle patterns anymore. So Isolate Blending in some ways acts as a mask for your blending modes. It masks out your blending modes, so you only see those within the context of your group. Now let's take a look at Knock Out Group. I am going to turn off Isolate Blending, deselect that with Command+ Shift+G and I am going to move this image off to the side because I am just going to focus on this image right now. What I would like to do is to create a mask, a mask that lets me actually poke a hole right through that image. For example, I will drag out a textframe here and I am going to type Bliss. It's the name of our chocolate company here.
I will make that larger with keyboard shortcuts, I will just change this to bold, condensed, make that little bit tighter with my kerning. Option+Left Arrow will tighten up the kerning. Now I would like to make it even a little bit bigger than it is, so I am going to press Command+Option+C, which scales the textframe so that it's just around the text itself. That's just a fast way to let me scale this larger. I shrink the frame to fit the text and then Command+Shift+drag on one of these corners to make it as big as I want it to be.
Here we go. So I would like this word to be a mask for the image behind it. I want to poke a hole right through that image in the form of this word, so how do I do it? It's strange, follow along here, it's a weird technique. I select the textframe, I set its Opacity to zero in the Effects panel all right, which makes it disappear, it has an Opacity of zero, but it's still there. So if select that textframe and the image behind it or in this case, this whole group of objects behind it and then group them, Object > Group. Now I can do this weird technique with Knock Out Group. Knock Out Group means take that object that has the effect applied to it, the transparency of zero percent, and apply that to the group itself. So I have turned that into a mask. I can actually see right through the text here.
I can even move this, this is still editable objects. So for example, I will click on the Select Content button in the Control panel and I can drag that middle point, the center point of that textframe around, and as I move it, you can actually see that I can keep seeing right through it. It's actually poked a hole right through the group behind it because that's a whole group with Knock Out Group turned on. Okay I admit it. These checkboxes do really weird things, but this masking feature based on this Knock Out Group checkbox is so cool that it's really worth trying it out a few times.
Speaking of masks and cool effects, we are going to look at even cooler stuff in the next movie when we talk about integrating InDesign in Illustrator.
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