![]() The second technique I use is called the Google PageSpeed Module, a server extension which you can install either for Nginx or Apache. This script could be added to cron daemon to optimize the new images as they come in. media -iname '*.gif' -exec sh -c 'gifsicle -b -O3 -o ""' \ I use the following bash script to find every image and optimize it on the fly: #!/bin/bashįind. I use gifsicle for GIFs, jpegtran for JPEGs and optipng for PNGs – these are command line utilities used as prebuilt packages for your OS. ![]() It is impossible to manually optimize every JPEGs or PNGs so I utilize a couple of automatic size reducing techniques. eCommerce sites powered by Magento are the complex catalogs with thousands of images. ![]() I optimize images as a part of my Magento speed optimization service. Sheelah Brennan, Web developer and owner of, With proper training for content creators and the proper planning and implementation techniques completed up front by developers, images can be an asset and point of differentiation for a website or web app, instead of a frustrating bottleneck. Third-party tools like Cloudinary are another solution.Īudit the site regularly to make sure image best practices are being followed. Another approach is to use the element, for cases where you want to do art direction on a photo, with full control over what part of the image is shown at various screen sizes. Responsive image functionality is already built into some CMS systems, for example, WordPress uses Picturefill to ensure support of older browsers. The most straightforward way is to add the image ‘srcset’ and ‘sizes’ attributes to all images. This is built into CMS systems like WordPress and Drupal. Programmatically set maximum file size and dimensions for images that can be uploaded to the site if possible. For a CMS, this can be done with an add-on that optimizes all newly added images, such as the E When possible, use SVG instead of PNGs for web graphics because the file size tends to be much smaller and they look crisp on all sizes of screens and devices.Īnimated GIFs, if used, should be optimized as well (see this article).īuild in an image optimization tool. Run the image through an optimizer like ImageOptim (OSX and Linux, free) or Caesium Image Compressor (Windows, free), or TinyPNG (online). Provide guidelines for the content creator on maximum file size and dimensions for images that will be uploaded to the site. Within the “Save for Web” options, make sure to specify an appropriate image size and choose the desired image quality (60% is generally a good bet). If using Photoshop, make sure to crop the image where possible, then use the “Save for Web” feature for saving all images that will be used on the site. PNG-8 can be used for graphics like logos with simple colors, resulting in a smaller file size than PNG-24 (see this table in Lara Hogan’s “Designing for Performance” book). For example, PNG files should not be used for still photos (JPGs are the better choice), but they should be used for web graphics with transparency. Train the content creator on what type of image files to use in different situations. With the ever-increasing percentage of users on mobile devices, properly sizing and optimizing images to provide a good mobile experience is even more important. Unoptimized images can be incredible bottlenecks that turn an otherwise well-built web page into a slow loading, bloated one.
0 Comments
Leave a Reply. |