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Applying a Halftone Screen to all of your images is a radical way of completely changing its texture. Here we have the Halftone pattern applied to the right-hand side of the face. I could switch that if I click on the layer mask of layer 1 and press Command+I or Ctrl+I, we now have it on the left. These halftone dots reflect the original texture that's in there and it's done not using the Halftone filter that is under the Filter menu in the Sketch group, and it's not done that way because well, let's have a look.
If I go and apply that to the image and we choose Halftone Pattern, we can change the size of the dot, we can change the contrast, but all of the dots are going to be the same size. It doesn't really look like a halftone. I mean it's interesting, but it's not what we're after in this case. So instead we're going to approach it by duplicating one of our channels and then converting that channel to the Bitmap mode. At the time of converting it to a Bitmap, we can choose Halftone Screen, the Screen Frequency, we then copy the result back into the color image and then on a separate layer we apply a layer Mask and work into the original image however we choose.
I'm going to switch over now to the starting image which is just a single layer and go to the Channels panel, here are our channels. Let's begin by just evaluating the channels. Command+3 is the red, Command+4, the green and Command+5 the blue. I want to use the Green. I just like the tonal values of the Green, best of all. The Red is too light, the blue is too contrasty. I'm now going to right-click on the Green channel and choose Duplicate Channel.
Now very important here, we're not duplicating this channel within this document, we're duplicating it and creating a new document from it. So I need to change this here to New. I can give it a name. I might as well call it Green, and then click OK. And that's where we end up. We're now in that new document that's created from the Green channel. It's now listed as Alpha 1. I'm going to come to the Image menu, choose mode>Bitmap. The Output Resolution needs to be the same as the resolution of the original image which is 300.
The Method we're going to use Halftone Screen. I'm going to click OK, and then we choose the Screen Frequency, the Angle, and the Shape. Because I want a course Halftone Pattern, I'm going to use a Frequency of 30. I'm going to leave the Angle at 45 and the Shape can stay round, but I got a quiet a few different options here that we can experiment with the different results. That's the result it gives me. Now based upon the feedback that I get from that, I realized that I need to just adjust the tonal values in the grayscale image because I'd rather not have any dots over here on the right-hand side.
So I'm going to undo that, and then I'm going to go to my Levels, Command+L or Ctrl+L and get the Wide Coin slider and there is this spike on the right-hand side which I'm guessing represents these light gray values over here. Now if I get my white point slider and drag that to about there and then click OK, and now we'll go through that process again, Bitmap>Halftone Screen>Frequency 30, and now we've got rid of all those dots on the right-hand side.
So I'm going to Select All, Command+A, Command+C to copy, switch back to our original document where we're viewing just the Green channels, so I need to come and click on RGB, so that we're viewing the Composite channel. Come back to my layers panel and I can now choose Command+V and that's going to create a new layer. Now this is a very symmetrical image, so my choice here is suggested for me I'm just going to divide the image in half. If I wanted to, I could turn on my Rulers, Command+R or Ctrl+R, and come to my Preferences, go to Guides, Grids, and Slices.
Don't go to Guides, Grids, and Slices, go to Units & Rulers instead. I want my Ruler Units to be in percent, which I sometimes find very useful. Right there I see my 50 knock, so I can use that as my visual guide, draw myself a marquee selection. I'm on layer 1 and now I want to just use that as a layer Mask so I'll click on Add layer mask, and it's going to retain that portion for the right-hand-side, and fill the left with black.
If that's the inverse if what we wanted, then all we'll need to do is press Command+I or Ctrl+I.The way to remember how a layer Mask works is white reveals black conceals, and we can see that's what's going on here. Where it's white, it's revealing the Halftone Pattern, where it's black, it's concealing it, and then because we have the original underneath, that's the effect that we get.
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