![]() Figures in grey across the bottom indicate the resulting total image folder size in KB, and as a percentage size of the original Photoshop save-for-web JPEG exports at 80% quality. Like most of our case studies, the page is image heavy in order to show off our work, and we were interested to see what kind of file size savings we could achieve.įigures in grey across the top indicate quality settings used (where available). There are a number of different compression libraries available for JPEGs, so we put a few of them to the test on a set of images featured in one of our project case studies on the Kyan website. For very small images (like thumbnails), progressive JPEGs will often result in a larger file size, so switch back to baseline for anything under ~10KB. 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 ![]() 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. As well as masking, cropping, mirroring effects, and adjusting the DPI.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. ![]() You can easily resize, add a watermark, change contrast, brightness, or gamma, apply filters, and many other things to your images. XnConvert fully supports more than 400 file formats (jpeg, tiff, png, gif, camera raw, jpeg2000, WebP, OpenEXR, etc.). It comes in a simple and straightforward interface that is extremely simple to navigate. The application can handle various file formats and provides you with numerous image-processing tools that can come in handy when performing image operations. From the author of the popular XnView and XnView MP. XnConvert was developed to be a simple yet powerful tool that allows you to convert images easily. ![]()
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