In this movie I'll show you have to change the size at which an image prints without harming a single pixel inside the file. There's a couple of ways to change the print size of an image. One is to go up to the File > Print command or you can press Control+P or Command+P on the Mac. And if you end up getting this warning, that the printer information saved along with the file is not compatible with this version of Photoshop, don't worry about it. Just go ahead and click OK and up comes the Print dialog box.
Now the Print command is specifically designed for local printing, by which I mean you're either printing to a device that's connected to your computer or you're printing to a device on a network inside your home or office. It does not affect how the document will commercially reproduce or the size at which it will import into Illustrator or InDesign. Now, the first thing I want to do is switch to a wide layout here, which will better match the proportions of my image. And then, notice here, you've got this checkbox to scale to fit the media. We might as well, that's going to expand, of course, the size of the image because we've got so many pixels to work with in the first place. Now anytime you scale the image inside the print command you do not resample the image.
So you're not changing the number of pixels, which means that if I scale up to fit the media, my resolution is going to drop. In this case, to 860 pixels per inch and the Scale value goes up to 116%. But let's say that's not big enough. I want to go ahead and scale this area vertically as well. So, I'll turn off Scale to Fit Media, such as a width of 12 inches. And that goes ahead and scales the image to 131% and it reduces the print resolution to 764 PPI.
Now, at this point, you can either print the image by clicking on the Print button or you can save your changes here inside the Print dialog box by clicking Done. And I'm going to go ahead and just click Done. Now I want to confirm that we did save that information. So, I'll go back to the file menu, choose the print command again and sure enough you can see resolution is 764 PPI, it's got a width of 12 inches alright so, everything is here I can go ahead and click the done button again. But as it turns out there's a disconnect between the image size command and the print command. Well the print command scrupulously pays attention to everything you do with image size.
The image size command ignores everything you do with print. And it may seem like a bad thing, but it's actually really great because it means you can decide how big your image will commercially reproduce as well as how it will place into Illustrator and InDesign using image size. And you can decide how to print the document locally using the Print command. So I'll go up the the Image > Image Size command. And you can see sure enough the width is still 9.18 inches, and the resolution is 1,000 pixels per inch. Let's say I want the image to be 12 inches wide.
Well just go ahead and dial in a width of 12 inches as you can see here. But because I have the Resample check box turned on, we're going to end up adding pixels to the image. And notice that the Image Size Dimensions right here have grown. So the image is now going to be 12,000 pixels wide and the size of the image in RAM is growing from 166 megabytes to almost 284 megabytes. Well, let's say I'm not paying much attention, and I just go ahead and click on the OK button in order to accept that change.
This is a realy computationally intense process for Photoshop. And you can see, that it's going to take a long time because the program hasn't even gotten around to displaying the pogress bar yet. And once it does show the progress bar It ends up hanging right there at that location. Well, we don't want to prolong the pain for you, we're going to make the process happen faster. After the progress bar goes away, it's going to look like Photoshop is scrolled us to a new location in the image. In fact, we are on the top of the volcano and the reason we're not looking at the Tyrannosaurus' head is because, since the image's grown, his head has moved out of view.
So I've got to press and hold the H key in order to get my hand tool here, and I'll go ahead and drag this rectangle over the tyrannosaurus' eyes, and I'll release, and you can see that the image has grown. And just to give you a sense that that indeed has occurred. I'll go ahead and press Control+Z or Command+Z on a Mac to undo. And you can see sure enough the eyes are smaller in the original version of the image. So, if I press Control+Z or Command+Z again, you see the eyes grow, which tells us that Photoshop is up-sampled the image, it's added pixels.
And, this is a problem for a few reasons. First of all, we already had a ton of pixels inside this image. We used to have, before we messed it up, we used to have 58 million pixels inside this image which is more pixels than you can capture with any digital camera on the market. Now the image has grown to 99 pixels which is just ridiculous. It's way more pixels than we need. And we've got this whopping big file size as we can see down right here. And even though that added to the technical resolution of the file, it is not added to what's known as spacial resolution, which is whether the image appears to have any more detail to your eyes.
And spacial resolution by the way, is really all that counts. And finally, because we've rewritten every pixels inside this file. We've applied what's known as a destructive modification. That is not to say that we've destroyed the image. However, we have undercut its integrity and we have made a permanent modification to the file, if we were to move on. So, what I'm going to do, is press Control+Z or Command+Z on a Mac, to restore the original good version of the file, with its optically captured 58 million pixels And its intense spatial resolution.
And then I'm going to go back to the image size command, and I'm going to turn off the re-sample checkbox. And notice, by the way, the image size, 166 megs, essentially. If I change the width value now to 12 inches the resolution value is 765 pixels per inch as opposed to 764 in the Print dialog box. But nothing up here changes one iota and you know what. Given that we have so many pixels, I could set the file to print even wider. I could turn it into a poster by changing the width value to 34 inches, for example. That takes the resolution down to 270 pixels per inch, which is plenty for commercial reproduction.
And did you notice throughout, because we've got this wonderful preview right here. As I made my modifications, nothing changed whatsoever. And that's because we're not harming or changing a single pixel, and that's the way it is when you turn off the re-sample checkbox. All right. I'll go ahead and click OK in order to accept that change. And now, just to see what's happened in the Print dialog box, I'll go up to the File > Print command again. And you'll see that the Print command has paid attention to the changes we made inside the Image Size dialog box. We've got now a print resolution of 270 pixels per inch the width is 34 inches and so forth.
And so we could either print to a different device that allows us to print such a large image. Or I could just print a detail by turning off the center checkbox under position here and that allows me to just go ahead and drag the image inside the page. So that I could print just the Tyrannosaurus' head. And you can do that by clicking on the Print button or you could just save your work by clicking on Done. And that's how you change the size at which an image will print without rewriting a single pixel here inside Photoshop.
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