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In this movie, I''ll show you how to preview an image at exactly the size it will print, right here inside the image window. Now, before we start, I should tell you one of the things you're going to need is either tape measure or some sort of ruler, so that you can measure your screen. And also, this only works when you're printing at a 100%. So what I recommend you do is go up to the File > Print. Confirm that the Scale value is set to 100%. If it's not, go ahead and reset it. Also turn on my Center checkbox to center the image, and then I'd go ahead and click on the Print button in order to print that job.
So, I can later compare it to what I see on screen. Now, what you're supposed to be able to do, is go to the File > Print Size. But if you're doing this along with me, you will find that the image you just printed and the image you're seeing on screen are actually different sizes. And that's because, by default, the command does not work. You have to first make Photoshop aware of your screen's resolution. And that means measuring your screen and figuring out the size of the pixel display.
So, step one is to measure the width of the entire screen. Now, mind you, you're not measuring the frame around the monitor, just the bright imageable area of that screen. Now, in my case, I'm working on a 23-inch monitor. But monitors are measured diagonally. After all that's the biggest measurement. And display vendors like to make their devices sound as big as possible. My 23-inch screen actually measures 20 inches wide. So that's the first number you have to find out.
The second number you get to on a Mac the same way you get to those color options. I'll go ahead and zoom in here, so we can see what I'm talking about. You choose Apple > System Preferences, and you click on the Display icon. And then, you find the width value. How wide is the screen in pixels? Here on the PC, I press the Window button and the D key, in order to switch to the desktop. Then I'd right-click inside the image window and choose Screen Resolution. And I can see that the recommended resolution is 1920 pixels wide.
We only care about the width value because I only measured the width of my screen. In my case, however, I have the resolution set to 1280 by 720, which is how we record these videos. Next, I'd go ahead and bring up my calculator. And you take the resolution value and you divide it by the measurement. So if I were working on a standard monitor, I would take 1920 and I would go ahead and divide it by 20, like so. And I would find out that the actual resolution of my monitor is 96 pixels per inch.
In my case, it's different though, since I only have my monitor set to 1280. I'll go ahead and divide it by twenty, and I find out that my screen's resolution is 64 pixels per inch. Alright. Now I'm going to switch back to Photoshop and I'm going to turn off that text layer right there. Now, we're going to change a preference setting and the easiest way to bring up the Preferences dialog box is to press Ctrl + K here on a PC or Cmd + K on a Mac. And then, I'll switch to the seventh item down, Units & Rulers.
And notice the screen Resolution Value, which is set to 72 pixels per inch by default. There's just about no monitor out there that has this resolution set that low. Mine does, I'm just at 64 pixels per inch. But more likely, you're anywhere between 96 pixels per inch, as with the standard PC display, and all the way up to something like 120 pixels per inch if you're working with, say, a MacBook Pro or some other portable device with a really nice screen. But as I say, mine just crack down to 64 pixels per inch.
So I'll go ahead and enter that number. Then I'll click OK. And now, whatever number you've entered should be able to, now go up to the View > Print Size. And Photoshop will zoom the image to its printed size. And now, you should be able to take that piece of paper that you just printed, hold it up to the screen, and find out that the images are, if not absolutely identical than very nearly so. And that's how you preview the image at the exact size it will print here in Photoshop.
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