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The total number of pixels on a CCD array. This is not always the best indication of a camera's resolution as some CCD chips have a number of pixels around the that are only used to ensure the pixels that are used produce accurate colours. The true indication of a camera's resolution is the two figures quoted, say 1600x1200, which indicate the CCD's actual output. "A ... MP camera" is used to describe a model that has a CCD with a certain number times million pixels, which says something about how big the images are that it can create.
The camera's light sensitive CCD converts the scene into a grid of pixels that make up a digital photograph. The resolution is the total number of pixels in the photo, for example, one million or 350,000. This is one factor that affects image quality, providing the image that's being formed on the CCD is sharp. CCDs with greater numbers of pixels should have higher resolution. Buying adviceUnless you have a specific need for a low resolution model choose a camera with the highest resolution you can afford. This will enable you to make bigger enlargements.
Cameras offer different levels of image quality which is determined by lens quality and the resolution (number of pixels) delivered by the CCD. Basic cameras have VGA resolution CCDs that record images with 640x480 pixels. Next up are SVGA models that record 800x600 pixels and then the XVGA models that create pictures with over 1024x768 pixels. The latest super megapixel models go way beyond these figures – currently creating images up to 3040x2016. If you're buying the camera to take pictures for use on screen you only need to buy a VGA model, but if you demand photo quality you need at least a megapixel variety and even then the quality is only good to about 5x7inch from a normal inkjet printer.
A problem with a CCD that makes random colour pixels appear around edges.
Used to describe a digital camera that has a CCD that delivers more than one million pixels.
Random coloured pixels that appear in dark or shadow areas when the light levels are below the camera's CCD sensitivity range. Noise is also often seen from scans made using a scanner that doesn't have a wide enough dynamic range to cope with the shadow and highlight areas in one scan. Some image editing programs have a Noise filter that adds a grain pattern to the image to make it look more like a natural photograph taken using film.
The resolution of a monitor or camera CCD that displays or records images with 1024x768 pixels.
A higher resolution monitor or camera CCD that displays or records images with 780x480 pixels.
The resolution of a monitor or camera CCD that displays or records images with 640x480 pixels.
An image sensor is a type of transducer (an electronic device that converts one type of energy to another). This particular type of transducer converts light (visual images) to electronic signals, in essence capturing images in an electronic form: pixels. Image sensors are used in digital cameras and other imaging equipment and usually consist of an arrangement of charge-coupled devices (CCD).