As more and more screens on our desktop, laptop and mobile devices are upgraded to retina displays, it is important to understand exactly what that means, in order to create images that will consistently render crisply. Retina is a term used by Apple, but you may see other terms such as Ultra HD and the like.

A Retina (or ultra HD) display simply refers to a screen or monitor that has a greater density of pixels (px) embedded in it, allowing it to render text and images at a super high resolution. Content on a Retina display will look extraordinarily crisp, with colors feeling saturated and very life like.

However, because of their higher pixel density in comparison to standard-resolution screens, Retina displays require images with more pixels in them. This ensures that images viewed on the display look crisp and clear. Images uploaded at standard resolution will look slightly blurred.

How do you accommodate for this when you’re building a live image? The solution is really quite simple: double the size of your image when you create it in the platform. So, say you want to create a 400x400px banner for your email. You’ll actually set up the image at 800x800 when building it in the Zembula platform, which will give you the added pixels you need to render crisply on retina displays.

Note: The max size you can create a Zembula live image is 1000x1000px. However, that should still be more than enough to ensure your images will render well on retina displays.

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