What action can an email designer take to ensure images look crisp on HD screens?

To ensure images look crisp on HD screens, saving images out at double the size to ensure crispness when scaled down is the best approach. High-definition screens have a higher pixel density, which means they require images with more detail to prevent them from appearing blurry or pixelated. By saving images at a larger size, you provide a higher resolution version that will display more sharply when scaled down for different devices.

Using this method effectively utilizes the capabilities of high-resolution displays, ensuring that images remain clear and visually appealing. This practice is especially important in responsive design where images may be viewed on various devices with differing resolutions.

While exporting images as PNGs can improve quality for certain types of images, it does not universally guarantee the same level of crispness as using higher resolution images. Reducing the number of images may help with load time but does not directly enhance the quality of any single image displayed. Finally, assuming no action is needed overlooks the importance of optimizing for the diverse range of devices that users may have, particularly with the increasing prevalence of HD and retina screens.