Think of a digital image as a grid filled with square dots of color called pixels. Each pixel represents one color. Therefore, the more you subdivide the grid, creating more pixels, the more detail your image has. Basically, the more pixels the sharper the image. Contrary to what you might think, it is not always better to have more pixels.
Pixels take memory, and the higher the number of pixels, the more memory is needed.
Also, unless you have a fast computer with a large memory, you'll find that it takes a lot of time and space to work with photo-quality images. Digital Cameras Digital cameras create digital images that are either stored in the camera's memory or on removable disks. The main advantage of digital-camera technology lies in what you can do with the digital photo. Once you've resolved compatibility issues, you must decide what quality of image you require and how much storage space you need on your camera. The cameras come in three different classes.