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Tuesday, 9 June 2015

Digital photography

Digital photography is imaging using a pinhole camera, similar to chemical Photography. However, as in the latter images are recorded on a photosensitive film and subsequently revealed through a chemical process in digital photography the images are captured by an electronic sensor that has multiple photosensitive units, which exploit the photoelectric effect to convert light into an electrical signal, which is digitized and stored in a memory.The advantage of this system over chemical photography is that you have recorded images instantly, without having to bring the film to the lab and reveal the negative to see the images; this advantage in speed of image availability allows the photographer to make changes to the time and make corrections immediately deems appropriate, facilitating 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 they are in digital format, the photos can be sent directly via email, posted on the Web and can be processed with programs of photographic processing in a computer, to increase or restrict, make reframing (a part of the picture), correct colors and brightness, and perform many other possible modifications depending on the program you are using.

Another big advantage of digital photography is that every time the camera takes a picture creates a file Exif metadata (non-visual data) and stored within the image file capture relevant information such as date, time, opening diaphragm, shutter speed, ISO speed. This information is very useful to study the images and understand more about each photo and also facilitates the ordering and management of photographic archives.

Other useful resources existing in digital photography are the brightness histogram, a graph showing the distribution of pixels in the image according to their levels of brightness; and the RGB histogram showing the distribution of pixels in different color channels: in the case of RGB mode, the channels are red (R: red), Green (G: green), and blue (B: blue ). This resource does not exist in chemical photography.