Image resolution refers to the size of your photos in terms of pixel dimensions. For example, a camera that produces images that are 2,000 x 3,000 pixels will result in image sizes of 6 megapixels. The more megapixels a photo has, the more detail it has. Photos with low image resolution can appear jagged or 'pixelated'.
It is recommended that you upload your photos at full image resolution. Zenfolio will resize your photos dynamically to make them fit on the computer screens of your visitors while preserving full quality. Zenfolio uses the highest quality resizing algorithms to generate display images, and applies small amounts of additional sharpening in order to compensate for the loss in contrast when reducing size. The resulting images contain all the fidelity of your original photograph giving you access to a number of smaller size display images for online presentation.