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In this example I want to show you how we can use a Spot Color channel to create a metallic effect. Now of course we're not going to see as metallic on the screen. It's just going to be a simulation. But we're going to prepare this document so it can be printed using a Pantone metallic ink, specifically PANTONE 877. Before we go any further I need to convert this from an RGB image to a CMYK image. Even though I'm using a color managed workflow, there is some potential for confusion when working with Spot Color inks, so I'm going to actually do the conversion which is rare for me because I like to use color managed workflow and retain my images as RGB, but in this case I think it's a good thing to do.
So I'm going to go to the Edit menu and choose Convert to Profile, rather than Image mode and then CMYK. Doing it this way I get the option of choosing the specific profile, as well as, the specific rendering intent. Most of the times the default options, assuming that you have your default setup correctly are going to work just fine, but it's worth experimenting with the different rendering intents. And the one that looks the best is the one that's the best one for the job.
Now Absolute Colorimetric does give me more contrast, is that a good thing? I'm going to say that it is in this case. So I'm going to go with Absolute Colorimetric, and then I want to actually apply the Spot Color channel, now I already have an Alpha channel prepared. So I've made a selection and I've saved it, and now I'm going to make that selection into a Spot Color channel. I will Command+Click or Ctrl+Click on Alpha 1. That selects the shape of the swan.
I actually want to inverse this so that I apply the Spot Color to the background. So Select menu and Inverse, and then from the Channels panel, I'm going to choose New Spot Channel, and it remembers the last time I went to this, I chose PANTONE 877, but that won't always be the case, so I'm just going to go through the whole procedure, click on the Color Swatch to take you to your Color Libraries, your metallics in the PANTONE Solid Library are all the way down at the bottom.
If you know the number that you want, in my case it's 877, just type that in, Click OK, and then you can adjust the Solidity 100%. It's going to mean that the ink will print flat obscuring any tonal values beneath it. And I'm going to reduce that to 30%, so that we bring in some suggestion awfully ripples in the water. So there is our metallic effect, and I would now need to make sure that this gets saved in the Photoshop file format, and that we have Spot Colors checked here, so that the Spot Colors are saved with the file.
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