Zenfolio takes the utmost care in providing the best quality display for your photographs.
Every photo is converted to eight different image sizes using the highest quality resizing algorithms available. Each photo is made available in the following sizes:
All images and thumbnails are available to the owner for direct linking, and are also used in visitor pages.
Visitors automatically see the largest size image that fits their screen based on the resolution and browser window size. Making the browser window small will result in a small image. Maximizing the window on a high resolution monitor will load the largest image possible. In the Slideshow mode, the largest image size is always displayed.
At any time you can specify or change what size display images visitors can view. More information is available on this feature here.