![]() determine the maximum print dimensions of an image file if you know its pixel density,.With our pixel to print size calculator, you can do three things. You can also learn how to calculate the size of an image file with our image file size calculator. We can also express these values in camera megapixels by multiplying them together to come up with 283,500 pixels or 0.28 megapixels, which we can usually see in our camera settings. By multiplying 180 PPI by the print dimensions of a 2R photo paper, which is 2.5" x 3.5", we get our required image dimensions in pixels of 450 pixels x 630 pixels. Let's say we want to print our pictures on sheets of 2R wallet-sized photo paper.įor this print, we can go for the 180 PPI pixel density. If you like taking pictures and plan to have them printed right away and you need to save some storage space, you can use the equations above to know the minimum camera resolution you need for your desired print size. Image height in pixels = picture height * pixel density Image width in pixels = picture width * pixel density On the other hand, to calculate the required image file dimensions (in pixels) for a standard photo size or a specific print size at a desired pixel density, we just have to multiply the print width and print height by the pixel density, separately, as shown in the equations below: Print height = 4800 pixels / 300 pixels per inchįrom the computation above, we can now say that we can print the said image file up to a print size of 12" x 18" without compromising the image quality. Since big prints aren’t cheap, you’ll wisely decide on a smaller size and you’ll be more satisfied with the results.Īs you can see, all it takes to calculate print size is a little know-how and a little math.Print height = image height in pixels / pixel density However, if you want make a 30- x 20-inch poster out of that image, you’d have a resolution of 192 ppi (5,760 ÷ 30), which isn’t high enough to print well. That’s more than enough resolution to produce an awesome print remember, you need a minimum of 240 ppi though it really depends on the printer. For example, if an image measures 3,840 x 5,760 pixels and you want an 8- x 10-inch print, take the longest edge in pixels and divide it by the longest edge in inches of the target print size: 5,760 pixels ÷ 10 inches = 576 ppi. Next, open your Mac’s Calculator app and divide the longest edge of your image (measured in pixels) by the longest edge of your desired print size (measured in inches). The Status Bar in Photoshop (top) and Elements (bottom). The dimensions appear in the second section of the panel. In Photos, select a picture and press Command-I to open the Info panel. The first step in calculating what size print you can make is to find the image’s pixel dimensions and jot them down. Besides, if you always shoot with the same cameras at the same quality settings, you only have to calculate resolution a few times to learn what print sizes you can expect to make from those devices. And if the resolution you calculate isn’t high enough to print at, say, 8 x 10 inches, then you can make an informed decision to print at a smaller size before wasting time and money. Doing so lets you know exactly what level of quality to expect from printing at a certain size. This column is about empowering you to calculate resolution manually using the image’s pixel dimensions and the size of the print you want to make. Now, this column isn’t about whether you should or shouldn’t change resolution or even how to do it in those apps. If you don’t know what you’re doing, increasing resolution can trash an image because the app will add (interpolate) fake pixels that weren’t really captured. Other apps, such as Adobe Photoshop, Photoshop Elements, and Pixelmator also alert you to resolution deficiency in their print dialog boxes but they also let you fiddle with the resolution setting in their Image Size dialog boxes. Why? Because those apps calculate the resolution for you whenever you ask them to print an image at a certain size if you don’t have enough resolution, the app tells you so. ![]() Adobe Photoshop Lightroom doesn’t flaunt the setting either you only encounter it when exporting images. To keep things simple, Apple Photos won’t let you see image resolution, much less change it. However, if you forked out big bucks for an inkjet printer that can spray ink at higher resolutions-say, 1440 dpi or 2880 dpi-you can sometimes get a better result by aiming for a higher resolution in your calculation. Generally speaking, you need a resolution of at least 240 ppi to produce a nice print on most inkjet printers and online printing services. The lower the resolution, the bigger the pixels, which makes for blocky prints resembling a pile of Legos. Small pixels make for smooth, high-quality prints. The higher the resolution of an image, the smaller the pixels.
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