If you ‘re a graphic designer or photographer, or good want to make certain your vacation shots print without problems, you need to understand what DPI is, and how to change your print resolution. Let ‘s take a count at everything you need to know about DPI and how to change the DPI of an visualize .
Reading: 4 Ways to Change the DPI of an Image
What Is DPI and What Does 300 DPI Mean?
DPI stands for “ dots-per-inch, ” and is a specification for print and for setting the print settlement of an image .
A print is made from millions of bantam dots of ink. The DPI setting determines how many dots the printer drops onto every square column inch of the image—300 dpi means 300 dots of ink, while 150 dpi is one-half angstrom much .
You need to understand how DPI works because it controls the two most significant things in impression :
- The quality of your print. In simple terms, a higher DPI means a higher quality print. Most good home printers can output at 300 dpi, which is the recommended minimum for high-quality printing, and professional printers much higher.
- The size of your print. A pixel in a digital image is equivalent to a dot in a print. So, if you print an 1800 pixel wide image at 300 dots-per-inch, the printed image will be six inches wide. Print the same image at 180 dpi and it will be 10 inches wide. It’s basic math—just divide the number of pixels by the DPI.
How DPI Affects Your Prints
here ‘s an effigy to illustrate. Below are two lines that consist of the same 40 blocks—the same size and lapp tinge. The blocks are less tightly packed on the lead line, equating to a lower DPI ; and more tightly packed on the bottom line for a higher DPI .
The impression is clear. On the Lower DPI line, the gradient is a draw less smooth. You can see clear edges against each of the blocks. The line is besides a lot longer .
On the Higher DPI note, the gradient is much smoother. It ‘s about seamless. The credit line is besides a set shorter .
This demonstrates the balancing act you often need to make when setting the print resolution : size versus choice. A lower DPI trope prints larger, but at a lower quality. If you ‘re working with low res images, then you ‘ll have to make a tradeoff between the two .
Where possible, you should always save your work in deoxyadenosine monophosphate high a resolution as you can. Because resizing your image to make it larger wo n’t improve the print quality .
What DPI Should You Use?
All this begs the question : What is the best DPI to print at ?
The criterion rule is that you should aim for a 300 dpi double. This is great quality for photograph, and it ‘s questionable how much extra detail the human eye can even discern beyond that level .
But if your prototype is besides minor to print at 300 dpi, do n’t worry. The intend view distance of the print plays a large function in what resolution you need .
For images you ‘ll hold in your hands, like photos, leaflets, or magazines, 300 dpi or higher is the target, but 250 will do at a push .
With posters or pictures that you ‘re going to frame, you can get aside with a lower resolution because you ‘ll by and large be looking at them from a few feet away. 200 dpi should be approve, or even a little lower. This besides applies when you ‘re printing on different materials, like sail, which hold less detail due to their texture .
And this continues. The further aside you intend to look at your prototype, the lower you can set the resolving power. A billboard bill poster designed to be seen from across the street might be printed at deoxyadenosine monophosphate low as 20 dots per inch .
It ‘s besides important to note that these rules only apply to photos and raster images. If you ‘re doing graphic blueprint work with vector images, then you can resize them adenine much as you like without any personnel casualty of quality .
How to Check the DPI of an Image
To find out an picture ‘s DPI in Windows, right-click on the charge mention and choice Properties > Details. You ‘ll see the DPI in the Image section, labeled Horizontal Resolution and Vertical Resolution.
On a Mac, you need to open the image in Preview and choose Tools > Adjust Size. It ‘s labeled Resolution .
How to Change the DPI of an Image: 4 Ways
You can change an image ‘s DPI in most graphics packages, including the best budget purpose apps. You ‘ll need an app or on-line serve if you ‘re using Windows, as you ca n’t change the DPI natively otherwise. You can change the resolution in Preview on a Mac .
Remember that DPI is only a measurement of mark resolution. Changing the DPI does not change the size of your digital image or the size of the file .
If you ‘re working with an visualize you think you ‘ll need to print, it ‘s a good idea to set your target print resolution before you resize it. That will help to ensure you do n’t make it besides modest to print safely at your preferable size .
How to Change the DPI in Photoshop
To change an image ‘s DPI in Photoshop, go to Image > Image Size. Uncheck Resample Image, because this set will upscale your effigy, which will make it lower choice .
now, next to Resolution, type in your prefer resolution, set as Pixels/Inch. Notice how the Width and Height figures change, besides. This shows you the size your trope will print .
You can, of course, specify the width and height alternatively, in inches or centimeters. If you do this, fair make certain your DPI does n’t drop besides gloomy to degrade the quality. That can happen if your image is small .
How to Change the DPI In GIMP
To change the DPI of an image in GIMP, go to Image > Print Size. Enter your prefer DPI future to X Resolution, set in pixels/in. The Y Resolution should update automatically, besides .
Like in Photoshop, you can set the physical width and altitude alternatively. Again, make certain the DPI does n’t drop excessively low when you do this .
How to Change the DPI Online for Free
If you ‘re in a nip and you do n’t have your graphics program of option to hand, you can always change the DPI of an persona with Convert Town, a DPI-changing web app, for complimentary on-line .
All you have to do is input the DPI you need the image changed to ( common resolutions like 300 dpi are available as handy presets ), drag and drop the file to upload it, and expect. When it ‘s done convert, it should automatically download your update image to your default option download folder .
How to Change the DPI in Preview on macOS
You should use one of the above options if you ‘re using Windows. There ‘s a built-in solution on a Mac : Preview. The default option app for viewing images besides lets you change the DPI of those images, and it ‘s very easy to do .
Open the image in Preview and go to Tools > Adjust Size. Uncheck the box labeled Resample image to ensure you do n’t increase or decrease the number of pixels in the trope. now, with Resolution jell to pixels/inch, type in your target resolution ( such as 300 ) .
You ‘ll notice that the width and acme besides change, showing you the newly size the double will print at .
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Get Better Photo Prints
Understanding the mean of DPI is indeed authoritative when you ‘re printing. It ‘s easy to ruin integral projects because you ‘re working at besides low a resolution or to get bad prints because you ‘re printing them larger than they can handle .
But this is only the foremost step in printing—there ‘s a lot more you need to know to get the perfect print .