Enlarged pixels is seen as noise in digital pictures
In photography noise means the extra space on the picture that is not needed.
Digital photography noise is a common occurrence in photography when the setting of the ISO is too high or if you are using a cheap digital camera. When you press the shutter on your camera, light hits the sensor, and an analog signal is produced, which is converted to a digital image. If, during this time, something messes up the particles creating the analog signal, then noise is produced. Noise can be reduced in Photoshop www.goldprints.com
Noise. Noise is a visual distortion that looks like tiny colored specs on a photo. It is especially visible in images shot at high ISO or very slow shutter speeds. Noise is the digital photography version of film grain.
CCD digital sensors used in photography create low noise, high quality image with more pixels. CMOS usually have lower quality, lower resolution, and lower sensitivity.
Noise in photography can be either visible "grain" in the prints when using faster films, or visible pixels when the ISO speed of the sensor is boosted. Noise can interfere with sharpness/resolution. Sometimes noise appears as color "fringing" or "haloing" around bright objects, which can occur in either film or digital cameras. Some photographers work to reduce or eliminate all noise; others embrace it. Noise is not all bad. Grain or pixels make the image. If you're a "high rez" freak, keep your ISO low and opt for a tripod where possible. You may even choose to work in a larger format (Ansel Adams, the Dean of no-noise photography, made many of his most famous pictures with an 8x10-inch view camera). But if you're a hand-held camera-in-your-pocket available light freak (like me), don't be afraid to load 400 speed or higher, or boost the ISO on your sensor, and accept some grain or noise as the price of getting the picture. Below is the Related Link to the Wikipedia article on Image Noise.
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