With standard digital zoom, pictures captured by the image sensor of the camera are enlarged using digital signal processing. Therefore, as the magnification level increases, signals to be estimated also increase and can reduce the image quality.
When using Clear Image Zoom , however, zoomed images are captured close to the original quality when shooting a still picture. The camera first zooms to the maximum optical magnification, then uses Clear Image Zoom technology to enlarge the image an additional 2x, producing sharp clear images despite the increased zoom ratio.
The Smart Zoom™ feature allows images to be zoomed without losing picture quality. The central part of the picture is trimmed and enlarged without image processing.