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I've saved my progress as Colorful stemware.psd, found inside the 10_layers folder and in this exercise, we're going to be adjusting multiple layers simultaneously. So we're going to Invert a bunch of layers and then we're going to change the Opacity of a bunch of layers at once. The first thing I want to do is make these layers bright against the black background. So that means Invert and I'm going to do it using an Invert adjustment layer. So I'll press Shift+Tab to bring back my right side panels, there is Adjustments. I'll drop-down to this Invert button and click on it. Now you may wonder why I would do such of things.
After all, I was telling you a few chapters back that Invert is a nondestructive operation because every luminance level has an exact opposite luminance level. You can invert back and forth without harming the image at all. So why not just do that, particularly given that if you click on Invert here inside the Adjustments panel, there are No options for Invert. It's not like it's a really super powerful function. Well, it is a big time saver though. Let me show what I'm talking about. Go ahead and press Ctrl+Z, Command+Z on the Mac. We are ready to click on glass 1 and Invert it by pressing let's say Ctrl+I, Command+I which is a keyboard shortcut, notice that the Blend Mode is no longer doing what we wanted to.
It's burning in the background as opposed to burning in the glass. But we don't need to burn in the glass anymore because we've just reversed the luminance levels. We need the opposite Blend Mode of Multiply and that would be Screen and that doesn't work either. It just makes the glass invisible because the background is currently white. So we'd have to Invert it as well by pressing Ctrl+I, Command+I in the Mac. And now we have just one glass done. After all that work we're going to have to do that same thing, Invert and then apply Screen to both glass 2 and glass 3.
That's just too much effort and we are making our document less flexible in the meantime. So what I propose you to do is press Ctrl+Alt+Z, Command+Option+Z on the Mac as many as it takes to get back to here and then at this point, we're going to add that Invert adjustment layer. So click on that first icon in the third row. Actually I'm going to Alt+ click or Option+Click on it. So I can name the layer. I just hate that they're called Invert 1 and Invert 2 and that kind of stuff. I'm just going to call it Invert and click OK and we have a new Invert layer.
I'm going to press Shift+Tab to get rid of panels for a moment. Notice that this also goofed up our coloring scheme. So it's no longer blue, green, yellow. It's now orange and like magenta and navy blue and I don't want that. So this is a layer stacking problem. Notice if I press Ctrl+Left Bracket or Command+Left Bracket on the Mac, it's all fixed. Now I know Photoshop well enough to just do those kinds of things, just press keyboard shortcuts out of the blue without even looking at the interface. You may be more comfortable with bringing up the Layers panel in order to figure out what the heck went wrong before we had invert on top of colors and you might want to just drag it down.
But anyway, I just want to give you a sense as you become more capable inside this program, you're going to have less and less use for the interface because it's just going to have the sense, this magical wonderful sense of what's going on. Anyway, so we now have many layers inverted, not only all the layers inverted but also all the Blend Modes are being inverted right there on the fly and now at this point what if I wanted to change the Opacity of these glasses? Let's say, I want to take all three glasses, so I'll click on glass 1 and Shift+Click on glass 3 in order to select all of them and I wanted to change their Opacity levels to 70%.
Well, in Photoshop CS4 you couldn't do that. You can only change the Opacity of one layer at a time, so you'd have to do each one independently. Quite happily here inside of CS5, we can't change the Blend Mode which isn't right because they're all Multiply, so I should be able to change that but you can't.However, you can change the Opacity and Fill values. So I could just press 5 for example to change the Opacity of all three glasses to 50%, or seven for 70%. What I really want to do though is just change the forward glass to 70% Opacity.
So I'll leave it there. Then I'll click on glass 2 and Shift+Click on glass 3. I'll restore them to 100% Opacity by pressing the 0 key. There we have it. I have a bunch of bright glasses against the dark background with different Opacity levels. Thanks to your ability to adjust multiple layers simultaneously in Photoshop CS5.
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