Open an image in any bitmap format, like JPEG, PNG, or TIFF.Įnter values as noted below and then click OK.
Upsampling, by contrast, extracts patterns of details to fill in information, though it can’t create detail where none exists. You can downsample, which tries to average adjacent regions of pixels to reduce information without making it blurry. When you change the resolution on an image, you’re resampling it, or modifying the amount of information in it. However, you’d more realistically print a photo up to 8 by 10 inches on a 200 dpi or 300 dpi ink-jet printer, or post an image several inches wide at high density on a web page. In physical terms, that’s a whopping 56 inches by 42 inches. (It can also require some monkeying around with HTML, which many web-hosting sites and web-design apps help with.)Ī photo taken by some recent vintage iPhones are 4032×3024 pixels and marked as 72 dpi in the file. In order for interface elements and images alike to appear to their best advantage on smaller devices, creating high-density versions requires a lot of resolution. Smaller devices typically have higher ppi because you hold them closer monitors have lower ppi for the same reason. The ppi varies by display size, because it’s based on how closely your eye is to the screen for reading. The density started to increase dramatically, and now displays with 200 to 450 ppi are common, including Apple’s branded Retina displays. At one time not that long ago, most displays were 72 dpi or 96 dpi.
A higher dpi is required for higher-density displays.
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