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The advantage of this system compared to analog photography is that you have recorded images instantly, without having to carry the film to the lab and reveal the negative to see the images, this speed advantage in the availability of image allows the photographer to make changes at the time and make the appropriate corrections immediately consider making it easier to achieve the image you want.
In the digital camera can be viewed on a screen the photos you just took. The camera can be connected to a computer or other device capable of displaying photos on a monitor. As with computer format, the photos can be sent directly by e-mail , posted on the web and can be processed with photo processing programs on a computer to zoom in and make a frame (a part of the picture), correct colors and brightness, and perform many other possible modifications according to the program used. Another great advantage of digital photography is that every time the camera takes a picture creates a file and stored in memory capture important information such as date, time, aperture, shutter speed, speed of ISO This information is very useful to study the images and understand more about each photo and also facilitates the ordering and management of photo files.
Other useful resources that exist in digital photography is the histogram of brightness, which is a graph showing the distribution of image pixels according to the brightness and histogram RGB showing the distribution of pixels in the different RGB channels, as its acronym English: A network, G green, B blue. This resource does not exist in analog photography.
Professional digital cameras have the option to customize different types of users, allowing adjustment important image features such as saturation, contrast, sharpness and color tone. Additionally allow custom handling of white balance, which can vary significantly gamut and can capture images in black and white, sepia, filters, etc. The quick and easy to control the speed of ISO helps solve the problems of lack or excess of light.
The cost compared with the analog system for printed photo is smaller. Whereas it can take multiple shots and select and print only the best photographs.
Technology has brought digital cameras to mobile phones by increasing the number of users of photography and growing exponentially the new models improve the optical quality and image resolution, this has caused the task of the photographer must be rethought and restructured .
Digital photography has revolutionized the photographic medium. The images are increasingly screens that paper.
In the 2010 and there are millions of users who share their images through social networks like Facebook and other specialized web sites like Flickr , Picasa , which store, sort, search and share photos online

Storage

Memory card CompactFlash .
Digital cameras cell phones or cameras also use cheap memory or flash memory. They are commonly used memory cards: CompactFlash (CF), Secure Digital (SD), xD cards and Memory Stick for Camera Sony . Previously used disks 3 1 / 2 ” for storage of images.
The photos are stored in files JPEG format or in standard TIFF or RAW to get a better picture quality despite the large increase in file size. Video files are commonly stored in formats AVI , DV , MPEG , MOV , WMV , etc.
Almost all digital cameras use compression techniques to maximize storage space. The techniques of compression often take advantage of two common features in the photographs:
patterns: an image is very common to find areas where you see the same color (or the same sequence) repeated several times (for example, a white wall). Such areas can be coded so that the storage space needed for them to decrease. This type of compression does not usually get large percentages of decline.
irrelevance, like codification mp3 takes advantage of the auditory system’s inability to detect certain sounds (or lack thereof), in digital cameras you can use a compression is to remove information that the camera has captured, but the eye man is going to be unable to perceive.

The Bayer arrangement of color filters, an image sensor.
In most consumer digital cameras today, a Bayer filter mosaic is used in conjunction with an optical filter anti-aliasing to reduce the aliasing due to reduced sampling of the various primary-color images. A demosaicing algorithm is used to interpolate color information to create a full array of image data of RGB. Cameras that use a single-shot 3CCD approach beam-splitter, three-filter multi-shot approach, or Foveon X3 sensor uses no anti-aliasing filters, nor demosaicing.
The firmware on the camera, or software in a raw converter program such as Adobe Camera Raw, interprets the raw sensor information to obtain a complete picture of color, because the RGB color model requires three intensity values ​​for each pixel: one each for red, green, and blue (other color models, when used, also require three or more values ​​per pixel). A single sensor element can not simultaneously record these three intensities, and so a color filter array (CFA) should be used to selectively filter a particular color for each pixel.
The Bayer filter pattern is a repeating pattern of 2 × 2 mosaic of light filters, with green ones at opposite corners and red and blue in the other two positions. The high proportion of green takes advantage of human visual system characteristics, which determines brightness mostly green and is far more sensitive to brightness than to hue or saturation. A standard 4-color filter is sometimes used, often involving two different shades of green. This provides a potentially more accurate color, but requires a slightly more complicated process of interpolation.
The values ​​of color intensity not captured for each pixel can be interpolated (or be guessed) values ​​of adjacent pixels which represent the color being calculated