So it’s vital to ensure each image looks its best on a given platform. Sharing photography via social media is at the mainstay of modern commercial work and personal photography. Instagram, for example, run 1:1 crops making square photos and currently use a resolution of 1080 × 1080 pixels, although they also allow for landscape and portrait orientations of rectangular photos now, too. 16:9 picture dimensions are common and display in a letterbox shape, regardless of the resolution of the images. Online, photographs do not have any restrictions on size or shape, but many websites will use standard aspect ratio crops on images. Longer loading times affect search engine optimization, which means they may rank lower in the list on search engines such as Google. This is because websites with big files take longer to load. Arguably, it’s the file size of a photo that is ultimately more important than the resolution. Digital photo resolution is measured at 72 PPI universally across any device, so the only changing factor when it comes to preparing your photos for online use is the length and width of the image and how much compression is used to make the file small enough to load quickly on slow internet speeds. That makes resizing photos a little more tricky as they need to display easily (and load quickly) on any device. However, since pixels don’t have an average size, a 50” screen could have the same resolution as a 12” screen. Like in printing, a higher PPI equals finer detail in image reproduction. The density of the pixels per inch is known as the resolution, and often abbreviated to PPI. This is because regular photo sizes on different viewing devices (laptops, tablets and smartphones) all have screens made up of individual pixels with red, green and blue lights making each pixel on the screen. If you need a photo printer, check out Amazon's amazing bargains:ĭigital photo sizes are measured in pixels. The more you have, the greater the image detail. So that means the resolution of an image (how many dots/pixels that make up a photo) is determined by how many dots/pixels are along its width and its height, like this: 1800 × 1200. However, neither dots nor pixels have a standardized size. These dots and pixels combine together to create a photograph. Whereas each digital pixel is made from combining three colors: Red Green and Blue (RGB). A typical dot consists of four colors: Cyan Magenta Yellow and Key (Black), aka CMYK. For print, these points of color are called ‘dots’, in digital photos they’re referred to as ‘pixels’. Both print and online images are made up of height and width, and contain many points of color to represent what’s in the photograph.
The same is true for online use of digital photos, where height and width are restricted by the size and shape of the viewing device and the quality of said image impacts how fast or slow it loads on computers and webpages.īoth print and online photo use are almost identical in every way, but each have their own specific requirements and limitations. poster size), and the quality of the paper also impacts what resize settings we use. postcard size) will need to be printed differently to big photos (i.e.
There are two reasons why we might want to resize photographs: to print them or to display them online.
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