Armed with this knowledge, everything else is simple math. A still-acceptable quality requires that the print resolution should be no less than 150 DPI. ![]() Photographic quality (at an arm's length viewing distance) requires that the print resolution should be no less than 300 DPI (dots per inch), which can also be written as 300 PPI (pixels per inch). The only special knowledge we needed to solve the problem was about quality, which was easily found on the web. I've created the handbook Standard photographic print sizes for defining standard photo print sizes, which can be edited to provide missed sizes. We want to choose the maximum photo print size that allows us to print the digital image without quality loss. The photo print size name defines the linear dimensions of a photo print – for example, 4''圆'' or 4R photo print size means that the photo print has 102x152 millimeters dimensions. We have a digital image with the known size in pixels, for example 3264 x 2448, and we also have a known set of standard photo print sizes used by photographic printing services. The first calculator recommends the photographic print size for given digital image dimensions in pixels. 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.This article is about the relation between a digital image size in pixels and the photographic print size. ![]() 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. Identify what other sizes share the same aspect ratio so you can make the decision of what. In landscape orientation, the A/R is > 1, for portrait orientation the A/R is < 1 and for square screens, this is 1. 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. Find out what sizes you can print without cropping your images. WxH Calculate Aspect Ratio (short: A/R) is the width of an image or screen, divided by the height. 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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