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In this movie, we'll address interpolations and how it affects the transformation of layers inside Photoshop. It's a little bit technical, but it's really one of those issues where if you don't pay attention to it, it can come back to haunt you later. So let's imagine that I want to take this big martini glass and rotate it into place. Then I would press Ctrl+T or Cmd+T on the Mac to enter the free transform mode. And assuming I'm not working with the smart object, I would see this Interpolation option. By default, it's set to Bicubic Automatic, which means if you reduce the size of the layer, Photoshop will apply Bicubic Sharper.
If you increase the size of the layer, Photoshop will apply Bicubic Smoother. And if you leave the layer set to 100% but you rotated and apply other modifications that don't scale the layer then Photoshop will apply BIcubic interpolation. Let's take a look at what that might mean. I'm going to press the Esc key in order to escape out of the free transform mode. And I'm going to switch over to this image, that contains this very graphical type treatment. This time, I will use the smart object. So, I'll go ahead and click on a Stroke layer, and Shift-click on Indiana, to select that range of layers.
Then I'll right-click inside the image window, and chose Convert to SmartObject. now if I press Ctrl+T, or Cmd+T on the Mac, notice the Interpolation option is not there. That is strictly an oversight, there's no reason it shouldn't be there. But that means that we have to adjust the interpolation setting from another location, so I'm going to press the Esc key. And then press Ctrl+k, or Cmd+K on a Mac, to bring up the Preferences dialog box. And there it is, Image Interpolation set to Bicubic Automatic, and that will affect the transformation of every single smart object.
I'll go and cancel out, I just wanted you to see it, set to Bicubic Automatic. With that in mind, I'll press Ctrl+T or Cmd+T on a mac in order to enter to the free transform mode. I'll click the link between W and H and I'll change the W value to let's say 46.6%. And then I'll Tab over to the Angle value and change it to, like 2.5 degrees, and then go ahead and zoom in to 100% here. And I'll press the Enter key or the Return key on a Mac in order to apply that change. Now if you're working along with me, you're going to see a little bit of ratty edge.
And it's up to you whether you accept that kind of thing or not, this would be of course a web graphic imagine because it's pretty small. It's not a graphic I'd be comfortable sending out the door because of the fragility of these edges, there just too crunchy. Now if you're only going by the video, it probably looks just fine. And that's because we down sample and compress these videos. But I'll go ahead and zoom in a bit here so that we can get a better sense of what's going on. We do have some anti-aliasing evident here, but we've also go a fair amount of very subtle stair-stepping going on is what I'd say.
It's just the edge is tactile, and then we also have some haloing. And you may recall from our sharpening discussions in chapter 13, that Photoshop simulates sharpness by adding halos around the edges. And that's what it's done here. Now, they're very tiny halos, so they're not going to make any difference for print purposes. And you should know that. Bicubic sharper does not increase the quality of your printed output 1 iota. However you are going to be able to see these halos on screen.
So what do you do if you run into a problem like this? Well, if you're working with a smart object, thankfully you don't have to replay the transformation. You just do this, press Ctrl+k, or Cmd+k on the Mac to bring it to Preferences dialog box. And in my case I'm going to change it to Bilinear, because that's going to give me the smoothest results. And then I'll click OK. And now I'll press Ctrl+T or Cmd+T on the Mac, to re-enter the free transform mode, and you can see all our values are still there. I've got scale values of 46.6%, I've got angle value of 2.5 degrees.
Now if I want to replay the transformation with a new interpolation setting. All I have to do, is press the Enter key or the Return key on the Mac, and it's done. So it's quite convenient with the exception of the fact that you have to go back to the Preferences dialog box in order to change that setting. As opposed to changing it right here in the Options bar. So my recommendation is this, for day to day transformations, The safest thing to do is to press Ctrl+K or Cmd+K on a Mac and switch image interpolation to Bicubic best for smooth gradients just as it was set in CS5.
And then go ahead and click the OK button. This is also going to work better for our project because we're going to be transforming that martini glass not as a smart object but as a pixel-based layer. Three times in a row. You can imagine if we use bicubic automatic, the incremental damage is going to be greater. Whereas with standard bicubic, we're not going to see any problems. Now I'll go ahead and click the OK button in order to set that change. And that's how the interpolation setting affects the transformation of layers Whether express the smart objects or not here inside Photoshop.
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