Working with images
Every digital image is defined by a variety of attributes such as resolution, dimension, format, colour depth, colour profile, all of which determine the image's file size. And when it comes to digital content, file size is an important factor to consider, primarily because it needs to be fetched from the server and loaded to the end user’s device in a reasonable time.
Edition Digital supports three image formats; PNG, JPG, and GIF. The system will not compress, or alter the uploaded images in any way to decrease the file size or quality. This means you have full control over the quality and size of images in your digital edition, but if your images are not optimised, this can result in long loading times which leads to a bad user experience.
We recommend you stick to these guidelines. Use .jpegs for photos. We don’t recommend going over 1920 px × 1080 px for even the biggest images. Use the save for web option that will remove all unnecessary metadata and thumbnails and reduce images size considerably. Don’t go over 400kB for full screen image.
Using .pngs is very useful when you want transparency in the image, so it’s good for titles, buttons with drop shadow effect etc. But only use .png for assets with few colours. Never use pngs for photos with million colours. Make sure the average size of one colour title or simple button doesn't exceed 100 kB.
GIF images are rarely used nowadays, but that's not true for animated GIFs. Using animated GIFs you can quickly add some "flavour" to your digital magazine. But, if your're aiming to create more complex animations, it's best if you use our animation tool instead. To learn more, please read the article titled Animation explained.
A very simple rule of thumb is to keep the overall file size of all images on one page at a maximum of 3MB. This will ensure a good user experience and a healthy SEO level.