![]() ![]() mp4 format) is a better choice for animations, giving users more control over playback and more efficient use of bandwidth. They can be compressed by reducing the number of colors in the palette, or level of detail. GIF, being such an old image format (last released in 1989), tends to be inefficient and file sizes can be quite large relative to video, which is much more efficient. Images API attributes: ?bg=rgb:F44336&fit=thumb&w=800&fm=jpg GIFs: Graphics Interchange Formatĭo you need animation? GIF is a venerable format that has thrived because of its wide compatibility - appearing as ads, memes and in emails. The same PNG file, with the background colored and delivered as a scaled JPG at 41kb: Here’s a few examples of some artwork that’s repurposed for various sizes and backgrounds. This allows reuse or compositing to other more efficient formats. Append the attributes to a PNG file like this light gray: ?bg=rgb:e5e9eb&fm=jpg. One neat trick you can do with PNG files hosted by Contentful’s Images API is composite PNG files with an alpha channel over solid colors to match their background. Using PNG for large images with a lot of detail or a photograph can yield large file sizes that will not load quickly for your users. PNGs are very efficient for small images. With PNGs, your image can contain an “alpha channel” (transparency) that will composite over its background. PNGs are typically used for graphics, including infographics, logos, illustrations, diagrams and app screenshots. JPGs also don’t have a transparency channel. ![]() They are smaller file sizes than PNGs and will load quicker and provide a better user experience.ĭon't use a JPG for graphics, logos or anything with fine detail and an extensive color palette. JPGs are lossy image formats, but you can choose how much the image will be compressed. They're also the best choice for screenshots of games, movies or a frame from a YouTube video. So, which image file type should you use? JPG (or JPEG): Joint Photographic Experts GroupĪs the name suggests, the JPG file format is best for high-resolution photographs and artwork. In addition to these formats, some browsers also support newer formats such as WebP, which offers better overall compression and more features. There are four universally supported image formats on the web: GIF, PNG, JPEG and SVG. How to choose the right image file format However, this compression ratio comes at the cost of reduced quality that becomes more evident after zooming in on the image, or at extremely high compression ratios. Lossy compression algorithms always have a superior compression ratio (the ratio of the size of the compressed image to the original image) as compared to lossless compression. Lossless compression can reduce file size, but preserves visual quality. Some techniques are more noticeable than others. Lossy compression means the image is compressed in a way that reduces visual quality. It’s important to understand the difference between both types of compression as it explains the tradeoff you make between file size and image quality. Almost all forms of data that we see on the internet - text, images, animations, graphics and videos - are compressed to reduce the size of data and ensure faster load times in web browsers. If image files weren’t compressed, using the internet would be a serious exercise in patience. It might be crisp and sharp, but when you load the page, it’s painstakingly slow. Or, confusingly, your image might look perfect. The wrong format means that your image might look stretched, pixelated or blurry. The first thing to know is using the right image format for the right job means your design will come out just how you intended. It’s not always a black-and-white choice as to which file format will make your image look its best. ![]() Learning which format to use in a given scenario takes time to achieve. While most content creators might be familiar with the different image file formats, it can be tricky figuring out which one is optimized for your use case. The most popular web image file formats are JPG, PNG, WebP, GIF and SVG. These files come in a variety of formats, some of which you might recognize. According to Deloitte, an improvement of 0.1 seconds on mobile sites can boost conversion rates for retail sites by 8% and travel sites by 10% on average.Įvery graphic, logo, avatar and photograph you see online is an image file. Even small improvements to page load speed can make a big difference. ![]() Using the correct image format doesn’t just improve the presentation of your images it increases the speed of your website, boosts search engine ranking and can help your conversion rate. One of the easiest ways to level up your content is to use image file formats to your advantage. ![]()
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