Progressive JPEGs are not always smaller. On desktop machines this is less of a concern, but may be an issue on mobile devices. PJPEGs can be slower to decode than baseline JPEGs - sometimes taking 3x as long. Facebook found it reduced data-usage by 15%. Twitter, Facebook (iOS app), Yelp and Pinterest use progressive JPEGs in production. PJPEGs can improve compression, consuming 2–10% less bandwidth. Progressive JPEGs load from low to high quality The first shows a pixelated or blurry version of the image, and following scans improve in quality as the image continues to load. Progressive JPEGs divide the image into a number of 'scans'. There are two different methods of encoding JPEGs, and there are file size savings to be made by selecting the right one.īaseline JPEGs are encoded and decoded in a relatively simple manner: top to bottom. Once the format is decided, then it's time to look at compression algorithms, resolution, quality etc… JPEGs JPEG modes: Baseline (sequential) vs. If it's a photo requiring transparency: PNG
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In addition, you need to consider whether some images are best served in a vector format, if the desired effects can be achieved via CSS, and how to deliver appropriately scaled assets for each type of device.
Finding the optimal format and optimization strategy for your image assets requires careful analysis across many dimensions: type of data being encoded, image format capabilities, quality settings, resolution, and more. Each image (or set of images) should be considered on an individual basis.
There's no one-size-fits-all solution for this. The first step in any image optimisation job is selecting the right format. With this in mind, and with Google's shift towards page speed as a major factor in site rankings, it was time to take a look at our image optimisation processes here at Kyan and where we could make improvements. Longer load times have also been shown to negatively affect conversions. Pages with a longer load time tend to have higher bounce rates and lower average time on page. Page speed is important to user experience. When it comes to improving a website's performance, ensuring that images are formatted and compressed correctly can often result in big improvements - dramatically reducing load times and speeding up rendering.
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