We’ve already seen some examples showing the difference between progressive and baseline JPEGs. This makes the web pages appear to load slowly. Traditional baseline JPEGs leave considerable whitespace on the screen until the image has finished loading. With the increase in mobile devices with slower internet connections or retina devices requiring larger images, images’ time to load has slowed. Progressive JPEGs were all the rage back in the late 1990s when the internet relied on slow dial-up connections until the GIF format rose in popularity. Progressive JPEGs Improve User Experience Now let’s try to come to a conclusion about which is better. We’ve already looked at the differences between how baseline and progressive JPEGs load. Should You Save a JPEG as baseline or progressive? I’ll talk about the best scenarios to use progressive JPEGs a little later. In reality, the difference between the two will be much less visible. It should be stressed that these examples used large images on a slow connection to exaggerate the differences between baseline and progressive JPEGs. ![]() You know, the ones where the progressive jpeg is still shown blurred after loading 30% of the image: Let’s compare the two together with examples.īut, I am not going to show you some artificially produced comparisons (like you see on other sites). On the other hand, a progressive JPEG loads line by line, from top to bottom, in low quality and then progressively renders with successive “passes” until the image displays in full resolution. What is the difference between a baseline and progressive JPEG?Ī baseline JPEG loads the image from top to bottom, line by line, until the image is complete. Next, we’ll look at this in more detail by comparing progressive JPEGs with baseline JPEGs. You can clearly see the difference in resolution as the image is loaded. Let’s zoom in on the image around the 3-second mark ( high resolution): By 25 seconds, the resolution was pretty good. You may not have realized how long it took to download without watching the video.Īfter all, you could make out the image in reasonable detail within a few seconds. The 2.1MB image took 43 seconds to download completely. Progressive JPEGs are great for users on slow connections because they instantly see a lower-quality image rather than watching a blank space waiting to load.Īnd here is what it looks like on a slow connection with three passes: ![]() However, depending on the software and settings used, it can be up to 5 or more. It loads in low quality and then progressively renders with successive “passes” until the image displays in full resolution.Ī typical progressive JPEG loads within 3 passes. What is a Progressive JPEG Image?Ī progressive JPEG is an interlaced image that first renders line by line, from top to bottom. ![]() You can find an in-depth guide on JPEG, as well as how JPEG encoding works here. Because the compression of these images is very efficient, its usage on the web is prevalent.Īs of the 3rd March 2022, JPEGs are used on 74.3 percent of all websites. JPEG images work best on photographs or realistic images with a smooth tone and color variation. JPEG images can use the filename extension of. ![]() JPEG is an abbreviation for the Joint Photographic Experts Group. This article looks at the differences between baseline and progressive JPEGS, how you can optimize progressive jpegs for your website, and more.
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