HD Photo Viewer is a Windows Phone 8 app designed to give your images a sharper look. Some Windows Phone 8 devices reduce the display quality to improve viewer performance. HD Photo Viewer presents images at full resolution and many see a quality improvement.
HD Photo Viewer was recently updated to version 2.3 but a bug was discovered that prompted a second update a few days later that takes the app to version 2.3.2.
All totaled the two updates adds a handful of performance improvements along with 720p support for Windows Phones such as the HTC 8X. The developer has shared that many of the suggested features such as deleting photos are not possible because of API restrictions and couldn't be included in these updates.