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In this movie I'll introduce you to the print resolution standards so you have a sense of where they come from and what purpose they serve. After all everybody bandies about that you should print an image at 300 pixels per inch. And that's true in many cases, but it's not true in all cases. So with this image open, I'll go up to the Image menu and choose the Image Size command. And because I canceled out last time, it's coming up small. So I'll go ahead and increase the size of the dialog box by dragging the lower right corner.
Now I want to keep the width and height values the same as they are, so what I want to do is up sample the image which means I need to turn on the resample checkbox. Now notice the Fit To option here. Go ahead and click on it and choose Auto Resolution, and that's going to bring up this little dialogue box that lists what's known as a screen frequency. Screen frequency measures halftone dots so when you commercially reproduce a document, or when you send it to a laser printer, the printer lays down a ton of these little circular halftone dots.
And the number of halftone dots in an inch is known as the screen frequency. Now 133 is a really common standard. If you select Draft as your quality and then click Okay, then what Photoshop is going to do is match the resolution to the screen frequency so we now have a resolution value of 133 pixels per inch. If you go ahead and choose that command again and you set it to Good, then Photoshop is going to set the resolution to 1 1/2 times the screen frequency.
In our case, 200 pixels per inch and we're going to end up with this effect right there. And then finally If you go ahead and choose the command again, and you set the quality to best, then Photoshop's going to set the resolution to twice the screen frequency, which is 266 pixels per inch. The plain fact of the matter is, it's actually 267, because that standard screen frequency is 133 and a third, which is why the real universal standard, just so you know, is 267 pixels per inch.
But it doesn't really matter if you change it to something else. If you took that up to 289 pixels per inch you're not going to notice the difference, it's not going to look any different in print, in other words, then it did at 267. So, you're just adding pixels to the file. Another print standard, by the way, another print standard by the way is this one here. I'll go ahead and choose auto Resolution, and I'll increase the screen frequency to 150 lines per inch. And that way if I have the quality set to best and I click Okay, we get twice 150, which is 300 pixels per inch, which is where the well known print standard comes from.
The other value that's worth knowing is 360 pixels per inch, which is an ideal resolution for high end inkjet printing. About the lowest you want to go is 220 pixels per inch because any lower than that and you really start to see some jagged pixel transitions. So those are the numbers you need to know. In other words, at the very low end, 220 pixels per inch, for high end commercial output, 267 or 300 pixels per inch, depending on your screen frequency.
And you can always find that out from your commercial printer. And then, 360 pixels per inch for high end inkjet output. But all of this matters, by the way, only if you're printing the image, or importing it into Illustrator or InDesign. If the image is ultimately bound for the web you don't need to worry about resolution at all. In the next movie I'll demonstrate the best way to upsample an image.
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