A digital camera is a camera that captures still photographs digitally by recording images on a light-sensitive sensor.

Digital cameras include features that are not found in film cameras, such as displaying an image on the camera’s screen immediately after it is recorded, the capacity to take thousands of images on a single small memory device, the ability to record video with sound, the ability to edit images, and deletion of images allowing re-use of the storage device. Digital cameras are incorporated into many devices ranging from PDAs and mobile phones (called camera  hones) to vehicles. The term digital still camera (DSC) usually refers to a live-preview digital camera, with an  lectronic display, usually a rearmounted LCD as the principal means of framing and previewing, before taking the  hotograph and for viewing stored photographs. All use either charge-coupled device (CCD) or a CMOS image sensor to sense the light intensities across the focal plane. Images may be transferred to a computer, printer or other  device in a number of ways-the USB mass storage device class makes the camera appear to the computer as if it were a disk drive, the Picture Transfer Protocol (PTP) and its derivatives may be used,FireWire is sometimes supported, and the storage device may simply be removed from the camera and inserted into another device. The resolution of a digital camera is often limited by the camera sensor (typically a CCD or CMOS sensor chip) that turns light into discrete signals, replacing the film in traditional photography.The sensor is made up of millions of “buckets” that essentially count the number of photons that strike the sensor. This means that the brighter the image at that point, the larger the value that is read for that pixel. Depending on the physical structure of the

sensor a colour filter array may be used, which requires a demosaicing/interpolation algorithm. The number of resulting pixels in the image determines its “pixel count”. For example, a 640×480 image would have 307,200 pixels or approximately 307 kilopixels while a 3872 x 2592 image would have 10,036,224 pixels,or approximately 10 megapixels. The pixel count alone is commonly presumed to indicate the resolution of a camera, but this is a misconception. There are several other factors that impact a sensor’s resolution. Some of these factors include sensor size, lens quality, and the organisation of the pixels. Many digital cameras have preset modes for different applications. Within the constraints of correct exposure, various parameters can be changed, including exposure, aperture, focussing, light metering, white balance, and equivalent sensitivity. For example a portrait might use a wider aperture to render the background out of focus and would seek out and focus on a human face rather

than other image contents.Common formats for digital camera images are the JointPhotography Experts Group standard (JPEG) and Tagged Image FileFormat (TIFF).