Digital photography uses cameras containing arrays of electronic photodetectors interfaced to an analog-to-digital converter (ADC) to produce images focused by a lens, as opposed to an exposure on photographic film. The digitized image is stored as a computer file ready for further digital processing, viewing, electronic publishing, or digital printing.
Digital photography spans a wide range of applications with a long history. In the space industry, where much of the technology originated, it pertains to highly customized, embedded systems combined with sophisticated remote telemetry.
Any electronic image sensor can be digitized; this was achieved in 1951. The modern era in digital photography is dominated by the semiconductor industry, which evolved later. An early semiconductor milestone was the advent of the charge-coupled device (CCD) image sensor, first demonstrated in April 1970; the field has advanced rapidly and continuously ever since, paced by concurrent advances in photolithographic fabrication. A persistent challenge in semiconductor fabrication is that chips much larger than 1 cm2 are expensive to produce without defects, confining large image sensor formats compatible with traditional 35 mm optics to professional and prosumer markets.
As a product category at retail, apart from the enthusiast digital single-lens reflex camera (DSLR) category, most digital cameras now come with an electronic viewfinder, which approximates the final photograph in real time, which can also review and adjust (or delete) a captured photograph within seconds, making this a form of instant photography, as compared to most photochemical cameras from the preceding era.
Moreover, the onboard computational resources are usually able to perform aperture adjustment and focus adjustment (via inbuilt servomotors) as well as setting the exposure level automatically, so these technical burdens are removed from the photographer unless the photographer feels competent to intercede—and the camera offers traditional controls. As electronic devices by nature, most digital cameras are instant, mechanized, and automatic in some or all functions. Digital cameras may choose to emulate traditional manual controls (rings, dials, sprung levers, and buttons) or it may instead provide a touchscreen interface for all functions; most camera phones fall into the latter category.
In the creative space, digital photos are often combined with other digital images obtained from scanography and other methods that are often used in digital art or media art.
Until the advent of such technology, photographs were made by exposing light-sensitive photographic film and paper, which was processed in liquid chemical solutions to develop and stabilize the image. Digital photographs are typically created solely by computer-based photoelectric and mechanical techniques, without wet bath chemical processing.
The first consumer digital cameras were marketed in the late 1990s. Professionals gravitated to digital slowly, and were won over when their professional work required using digital files to fulfill the demands of employers and/or clients, for faster turnaround than conventional methods would allow. Starting around 2000, digital cameras were incorporated in cell phones and in the following years, cell phone cameras became widespread, particularly due to their connectivity to social media websites and email. Since 2010, the digital point-and-shoot and DSLR formats have also seen competition from the mirrorless digital camera format, which typically provides better image quality than the point-and-shoot or cell phone formats but comes in a smaller size and shape than the typical DSLR. Many mirrorless cameras accept interchangeable lenses and have advanced features through an electronic viewfinder, which replaces the through-the-lens finder image of the SLR format.
While digital photography has only relatively recently become mainstream, the late 20th century saw many small developments leading to its creation. The history of digital photography as we know it began in the 1950s. In 1951, the first digital signals were saved to magnetic tape via the first video tape recorder. Six years later, in 1957, the first digital image was produced through a computer by Russell Kirsch. It was an image of his son.
The first semiconductor image sensor was the CCD, invented by physicists Willard S. Boyle and George E. Smith at Bell Labs in 1969. While researching the MOS process, they realized that an electric charge was the analogy of the magnetic bubble and that it could be stored on a tiny MOS capacitor. As it was fairly straightforward to fabricate a series of MOS capacitors in a row, they connected a suitable voltage to them so that the charge could be stepped along from one to the next. The CCD is a semiconductor circuit that was later used in the first digital video cameras for television broadcasting, and its invention was recognized by a Nobel Prize in Physics in 2009.
The first image of Mars was taken as the Mariner 4 flew by it on July 15, 1965, with a camera system designed by NASA/JPL. Later, in 1976 the Mars Viking Lander produced digital images from the surface of Mars. While not what we usually define as a digital camera, it used a comparable process. It used a video camera tube, followed by a digitizer, rather than a mosaic of solid state sensor elements. This produced a digital image that was stored on tape for later slow transmission back to Earth.
The first published color digital photograph was produced in 1972 by Michael Francis Tompsett using CCD sensor technology and was featured on the cover of Electronics Magazine. It was a picture of his wife, Margaret Thompsett. The Cromemco Cyclops, a digital camera developed as a commercial product and interfaced to a microcomputer, was featured in the February 1975 issue of Popular Electronics magazine. It used metal-oxide semiconductor (MOS) technology for its image sensor.
An important development in digital image compression technology was the discrete cosine transform (DCT), a lossy compression technique first proposed by Nasir Ahmed while he was working at the Kansas State University in 1972. DCT compression is used in JPEG image standard, which was introduced by the Joint Photographic Experts Group in 1992. JPEG compresses images down to much smaller file sizes, and has become the most widely used image file format. The JPEG standard was largely responsible for popularizing digital photography.
The first self-contained (portable) digital camera was created later in 1975 by Steven Sasson of Eastman Kodak. Sasson's camera used CCD image sensor chips developed by Fairchild Semiconductor in 1973. The camera weighed 8 pounds (3.6 kg), recorded black-and-white images to a cassette tape, had a resolution of 0.01 megapixels (10,000 pixels), and took 23 seconds to capture its first image in December 1975. The prototype camera was a technical exercise, not intended for production. While it was not until 1981 that the first consumer camera was produced by Sony, Inc., the groundwork for digital imaging and photography had been laid.
The first digital single-lens reflex (DSLR) camera was the Nikon SVC prototype demonstrated in 1986, followed by the commercial Nikon QV-1000C released in 1988. The first widely commercially available digital camera was the 1990 Dycam Model 1; it also sold as the Logitech Fotoman. It used a CCD image sensor, stored pictures digitally, and connected directly to a computer for downloading images. Originally offered to professional photographers for a hefty price, by the mid-to-late 1990s, due to technology advancements, digital cameras were commonly available to the general public.
The advent of digital photography also gave way to cultural changes in the field of photography. Unlike with traditional photography, dark rooms and hazardous chemicals were no longer required for the post-production of an image – images could now be processed and enhanced from behind a computer screen in one's own home. This allowed photographers to be more creative with their processing and editing techniques. As the field became more popular, types of digital photography and photographers diversified. Digital photography took photography itself from a small somewhat elite circle to one that encompassed many people.
The camera phone helped popularize digital photography, along with the Internet, social media, and the JPEG image format. The first cell phones with built-in digital cameras were produced in 2000 by Sharp and Samsung. Small, convenient, and easy to use, camera phones have made digital photography ubiquitous in the daily life of the general public.
Main article: Digital camera
Image sensors are arrays of electronic devices that convert the optical image created by the camera lens into a digital file that is stored in some digital memory device, inside or outside the camera. Each element of the image sensor array measures the intensity of light hitting a small area of the projected image (a pixel) and converts it to a digital value.
The two main types of sensors are charge-coupled devices (CCD), in which the photocharge is shifted to a central charge-to-voltage converter, and CMOS or active pixel sensors.
Most cameras for the general consumer market create color images, in which each pixel has a color value from a three-dimensional color space like RGB. Although there is light-sensing technology that can distinguish the wavelength of the light incident on each pixel, most cameras use monochrome sensors that can only record the intensity of that light, over a broad range of wavelengths that includes all the visible spectrum. To obtain color images, those cameras depend on color filters applied over each pixel, typically in a Bayer pattern, or (rarely) on movable filters or light splitters such as dichroic mirrors. The resulting grayscale images are then combined to produce a color image. This step is usually performed by the camera itself, although some cameras may optionally provide the unprocessed grayscale images in a so-called raw image format.
However, some special-purpose cameras, such as those for thermal mapping, or low light viewing, or high speed capture, may record only monochrome (grayscale) images. The Leica Monochrom cameras, for example, opted for a grayscale-only sensor to get better resolution and dynamic range. The reduction from three-dimensional color to grayscale or simulated sepia toning may also be performed by digital post-processing, often as an option in the camera itself. On the other hand, some multispectral cameras may record more than three color coordinates for each pixel.
Except for some linear array type of cameras at the highest end and simple webcams at the lowest end, a digital memory device (usually a memory card; floppy disks and CD-RWs are less common) is used for storing images, which may be transferred to a computer later.
Digital cameras can take pictures, and may also record sound and video. Some can be used as webcams, some can use the PictBridge standard to connect to a printer without using a computer, and some can display pictures directly on a television set. Similarly, many camcorders can take still photographs, and store them on videotape or on flash memory cards with the same functionality as digital cameras.
Digital photography is an example of the shift from converting conventional analog information to digital information. This shift was a chemical and mechanical process that later became a completely digital process with built-in computers in all cameras.
The quality of a digital image is a composite of various factors, many of which are similar to those of film cameras. Pixel count (typically listed in megapixels, millions of pixels) is only one of the major factors, though it is the most heavily marketed figure of merit. Digital camera manufacturers advertise this figure because consumers can use it to easily compare camera capabilities. It is not, however, the major factor in evaluating a digital camera for most applications. The processing system inside the camera that turns the raw data into a color-balanced and pleasing photograph is usually more critical, which is why some 4+ megapixel cameras perform better than higher-end cameras.
Resolution in pixels is not the only measure of image quality. A larger sensor with the same number of pixels generally produces a better image than a smaller one. One of the most important differences is an improvement in image noise. This is one of the advantages of digital SLR (single-lens reflex) cameras, which have larger sensors than simpler cameras (so-called point and shoot cameras) of the same resolution.
The number of pixels n for a given maximum resolution (w horizontal pixels by h vertical pixels) is the product n= w × h. This yields e. g. 1.92 megapixels (1,920,000 pixels) for an image of 1600 × 1200.
The pixel count quoted by manufacturers can be misleading as it may not be the number of full-color pixels. For cameras using single-chip image sensors the number claimed is the total number of single-color-sensitive photosensors, whether they have different locations in the plane, as with the Bayer sensor, or in stacks of three co-located photosensors as in the Foveon X3 sensor. However, the images have different numbers of RGB pixels: Bayer-sensor cameras produce as many RGB pixels as photosensors via demosaicing (interpolation), while Foveon sensors produce uninterpolated image files with one-third as many RGB pixels as photosensors. Comparisons of megapixel ratings of these two types of sensors are sometimes a subject of dispute.
The relative increase in detail resulting from an increase in resolution is better compared by looking at the number of pixels across (or down) the picture, rather than the total number of pixels in the picture area. For example, a sensor of 2560 × 1600 sensor elements is described as "4 megapixels" (2560 × 1600= 4,096,000). Increasing to 3200 × 2048 increases the pixels in the picture to 6,553,600 (6.5 megapixels), a factor of 1.6, but the pixels per cm in the picture (at the same image size) increases by only 1.25 times. A measure of the comparative increase in linear resolution is the square root of the increase in area resolution, i.e., megapixels in the entire image.
Practical imaging systems both digital and film, have a limited "dynamic range": the range of luminosity that can be reproduced accurately. Highlights of the subject that are too bright are rendered as white, with no detail; shadows that are too dark are rendered as black. The loss of detail in the highlights is not abrupt with film, or in dark shadows with digital sensors. "Highlight burn-out" of digital sensors, is not usually abrupt in output images due to the tone mapping required to fit their large dynamic range into the more limited dynamic range of the output (be it SDR display or printing). Because sensor elements for different colors saturate in turn, there can be hue or saturation shift in burnt-out highlights.
Some digital cameras can show these blown highlights in the image review, allowing the photographer to re-shoot the picture with a modified exposure. Others compensate for the total contrast of a scene by selectively exposing darker pixels longer. A third technique is used by Fujifilm in its FinePix S3 Pro digital SLR. The image sensor contains additional photodiodes of lower sensitivity than the main ones; these retain detail in parts of the image too bright for the main sensor.
High-dynamic-range imaging (HDR) addresses this problem by increasing the dynamic range of images by either
Further information: Crushed black
Many camera phones and most digital cameras use memory cards having flash memory to store image data. The majority of cards for separate cameras are Secure Digital (SD) format; many are CompactFlash (CF) and the other formats are rare. XQD card format was the last new form of card, targeted at high-definition camcorders and high-resolution digital photo cameras. Most modern digital cameras also use internal memory for a limited capacity for pictures that can be transferred to or from the card or through the camera's connections; even without a memory card inserted into the camera.
Memory cards can hold vast numbers of photos, requiring attention only when the memory card is full. For most users, this means hundreds of quality photos stored on the same memory card. Images may be transferred to other media for archival or personal use. Cards with high speed and capacity are suited to video and burst mode (capture several photographs in quick succession).
Because photographers rely on the integrity of image files, it is important to take proper care of memory cards. Common advocacy calls for formatting of the cards after transferring the images onto a computer. However, since all cameras only do quick formatting of cards, it is advisable to carry out a more thorough formatting using appropriate software on a PC once in a while. Effectively, this involves scanning the cards to search for possible errors.
Main article: Comparison of digital and film photography
The primary advantage of consumer-level digital cameras is the low recurring cost, as users need not purchase photographic film. Processing costs may be reduced or even eliminated. Digicams tend also to be easier to carry and use than comparable film cameras. They more easily adapt to modern use of pictures. Some, particularly those that are smartphones, can send their pictures directly to e-mail or web pages or other electronic distribution.
The Golden Gate Bridge retouched for painterly light effects:
Manufacturers such as Nikon and Canon have promoted the adoption of digital single-lens reflex cameras (DSLRs) by photojournalists. Images captured at 2+ megapixels are deemed of sufficient quality for small images in newspaper or magazine reproduction. Eight- to 24-megapixel images, found in modern digital SLRs, when combined with high-end lenses, can approximate the detail of film prints from 35 mm film based SLRs.[failed verification]
A large number of mechanical film cameras existed, such as the Leica M2. These battery-less devices had advantages over digital devices in harsh or remote conditions.
Noise in a digital camera's image may sometimes be visually similar to film grain in a film camera.
Turn of the century digital cameras had a long start-up delay compared to film cameras, i.e., the delay from when they are turned on until they are ready to take the first shot, but this is no longer the case for modern digital cameras with start-up times under 1/4 seconds.
While some film cameras could reach up to 14 fps, like the Canon F-1 with rare high-speed motor drive., professional digital SLR cameras can take still photographs at the highest frame rates. While the Sony SLT technology allows rates of up to 12 fps, the Canon EOS-1Dx can take stills at a 14 fps rate. The Nikon F5 is limited to 36 continuous frames (the length of the film) without the cumbersome bulk film back, while the digital Nikon D5 is able to capture over 100 14-bit RAW images before its buffer must be cleared and the remaining space on the storage media can be used.
Depending on the materials and how they are stored, analog photographic film and prints may fade as they age. Similarly, the media on which digital images are stored or printed can decay or become corrupt, leading to a loss of image integrity.
Color reproduction (gamut) is dependent on the type and quality of film or sensor used and the quality of the optical system and film processing. Different films and sensors have different color sensitivity; the photographer needs to understand his equipment, the light conditions, and the media used to ensure accurate color reproduction. Many digital cameras offer RAW format (sensor data), which makes it possible to choose color space in the development stage regardless of camera settings.
Even in RAW format, however, the sensor and the camera's dynamics can only capture colors within the gamut supported by the hardware. When that image is transferred for reproduction on any device, the widest achievable gamut is the gamut that the end device supports. For a monitor, it is the gamut of the display device. For a photographic print, it is the gamut of the device that prints the image on a specific type of paper. Color gamut or Color space is an area where points of color fit in a three-dimensional space.
Professional photographers often use specially designed and calibrated monitors that help them to reproduce color accurately and consistently.
Most digital point & shoot cameras have an aspect ratio of 1.33 (4:3), the same as analog television or early movies. However, a 35 mm picture's aspect ratio is 1.5 (3:2). Several digital cameras take photos in either ratio and nearly all digital SLRs take pictures in a 3:2 ratio, as most can use lenses designed for 35 mm film. Some photo labs print photos on 4:3 ratio paper, as well as the existing 3:2. In 2005 Panasonic launched the first consumer camera with a native aspect ratio of 16:9, matching HDTV. This is similar to a 7:4 aspect ratio, which was a common size for APS film. Different aspect ratios are one of the reasons consumers have issues when cropping photos. An aspect ratio of 4:3 translates to a size of 4.5"x6.0". This loses half an inch when printing on the "standard" size of 4"x6", an aspect ratio of 3:2. Similar cropping occurs when printing on other sizes, i.e., 5"x7", 8"x10", or 11"x14".
In late 2002, the cheapest digital cameras were available in the United States for around $100. At the same time, many discount stores with photo labs introduced a "digital front end", allowing consumers to obtain true chemical prints (as opposed to ink-jet prints) in an hour. These prices were similar to those of prints made from film negatives.
In July 2003, digital cameras entered the disposable camera market with the release of the Ritz Dakota Digital, a 1.2-megapixel (1280 x 960) CMOS-based digital camera costing only $11 (USD). Following the familiar single-use concept long in use with film cameras, Ritz intended the Dakota Digital for single use. When the pre-programmed 25-picture limit is reached, the camera is returned to the store, and the consumer receives back prints and a CD-ROM with their photos. The camera is then refurbished and resold.
Since the introduction of the Dakota Digital, a number of similar single-use digital cameras have appeared. Most single-use digital cameras are nearly identical to the original Dakota Digital in specifications and function, though a few include superior specifications and more advanced functions (such as higher image resolutions and LCD screens). Most, if not all these single-use digital cameras cost less than $20 (USD), not including processing. However, the huge demand for complex digital cameras at competitive prices has often caused manufacturing shortcuts, evidenced by a large increase in customer complaints over camera malfunctions, high parts prices, and short service life. Some digital cameras offer only a 90-day warranty.
Since 2003, digital cameras have outsold film cameras. Prices of 35mm compact cameras have dropped with manufacturers further outsourcing to countries such as China. Kodak announced in January 2004 that they would no longer sell Kodak-branded film cameras in the developed world. In January 2006, Nikon followed suit and announced they would stop production of all but two models of their film cameras. They will continue to produce the low-end Nikon FM10, and the high-end Nikon F6. In the same month, Konica Minolta announced it was pulling out of the camera business altogether. The price of 35mm and APS (Advanced Photo System) compact cameras have dropped, probably due to direct competition from digital and the resulting growth of the offer of second-hand film cameras. Pentax have reduced production of film cameras but not halted it. The technology has improved so rapidly that one of Kodak's film cameras was discontinued before it was awarded a "camera of the year" award later in the year. The decline in film camera sales has also led to a decline in purchases of film for such cameras. In November 2004, a German division of Agfa-Gevaert, AgfaPhoto, split off. Within six months it filed for bankruptcy. Konica Minolta Photo Imaging, Inc., ended production of Color film and paper worldwide by March 31, 2007. In addition, by 2005, Kodak employed less than a third of the employees it had twenty years earlier. It is not known if these job losses in the film industry have been offset in the digital image industry. Digital cameras have decimated the film photography industry through the declining use of the expensive film rolls and development chemicals previously required to develop the photos. This has had a dramatic effect on companies such as Fuji, Kodak, and Agfa. Many stores that formerly offered photofinishing services or sold film no longer do, or have seen a tremendous decline. In 2012, Kodak filed for bankruptcy after struggling to adapt to the changing industry. (See Photographic film.)
In addition, digital photography has resulted in some positive market impacts as well. The increasing popularity of products such as digital photo frames and canvas prints is a direct result of the increasing popularity of digital photography.
Digital camera sales peaked in March 2012 averaging about 11 million units a month, but sales have declined significantly ever since. By March 2014, about 3 million were purchased each month, about 30 percent of the peak sales total. The decline may have bottomed out, with sales average hovering around 3 million a month. The main competitor is smartphones, most of which have built-in digital cameras, which routinely get better. Like most digital cameras, they also offer the ability to record videos. While smartphones continue to improve on a technical level, their form factor is not optimized for use as a camera and battery life is typically more limited compared to a digital camera.
Digital photography has made photography available to a larger group of people. New technology and editing programs available to photographers have changed the way photographs are presented to the public. Photographs can be heavily manipulated or photoshopped, and end up looking completely different from the original images. Until the advent of the digital camera, amateur photographers used either print or slide film for their cameras. Slides are developed and shown to an audience using a slide projector. Digital photography eliminated the delay and cost of film. Consumers became able to view, transfer, edit, and distribute digital images with ordinary home computers rather than using specialized equipment.
Camera phones have recently had a large impact on photography. Users can set their smartphones to upload products to the Internet, preserving images even if the camera is destroyed or the photos deleted. Some high street photography shops have self-service kiosks that allow images to be printed directly from smartphones via Bluetooth technology.
Archivists and historians have noticed the transitory nature of digital media. Unlike film and print which are tangible, digital image storage is ever-changing, with old media and decoding software becoming obsolete or inaccessible by new technologies. Historians are concerned that we are creating a historical void where information and details about an era would have been lost within either failed or inaccessible digital media. They recommend that professional and amateur users develop strategies for digital preservation by migrating stored digital images from old technologies to new ones. Scrapbookers who may have used film for creating artistic and personal memoirs may need to modify their approach to digital photo books to personalize them and retain the special qualities of traditional photo albums.
The web has been a popular medium for storing and sharing photos ever since the first photograph was published on the web by Tim Berners-Lee in 1992 (an image of the CERN house band Les Horribles Cernettes). Today photo sharing sites such as Flickr, Picasa, and PhotoBucket, as well as social websites, are used by millions of people to share their pictures. In today's world digital photography and social media websites allow organizations and corporations to make photographs more accessible to a greater and more diverse population. For example, National Geographic Magazine has Twitter, Snapchat, Facebook, and Instagram accounts and each one includes content aimed at the type of audience that is a part of each social media community. It is also important to remember that digital photography has also had an impact in other fields, such as medicine. It has allowed doctors to help diagnose diabetic retinopathy and it is used in hospitals to diagnose and treat other diseases.
Main article: Photo manipulation
New technology with digital cameras and computer editing affects the way we perceive photographic images today. The ability to create and fabricate realistic imagery digitally as opposed to untouched photos changes the audience's perception of "truth" in digital photography. Manipulation in the digital era allows us to brush up our pictures, shape our memories to be picture perfect and therefore shape our identities.
As photography in its early stages was mainly used for physically preserving a family's heritage, it has now evolved into a key part of one's self of identity in the 21st century. Internet users often personally photograph and repost pictures that revolve around the ways they want to personally express themselves and their chosen aesthetic. With the invention of digital photography, photographs became less destructible and more easily maintained throughout the years, as they could live across all types of digital devices. Digital photography advanced the use of photos for communication and identity rather than as a means of remembering.
Digital cameras changed the way we interpret the world around us, which in turn, changed our true vision. With the popular phrase circulating on the Internet "pics or it didn't happen", people today carry a notion that one cannot claim to have seen something unless they have photographed it. The modern mindset that we must photograph and post where we are or where we have been to so we can add it to our "checklists" is a result of digital photography.
As the disappearance of film photography left a missing piece of nostalgia, digital photography created a way to make up for this gap with filters. Filters that could add film grain, scratches, fading, polaroid borders, and more grew immensely in popularity along with the idea of social photography. Social photography can be defined as a casual sharing of images: a picture of your food at a restaurant, a selfie sent to your mom, or a picture of your dog. Social photos differ from "true" photography as they are not meant to carry the same weight as real "photographed" thing. They are not meant to be scrutinized for lacking the rule of thirds, amazing compositions, and perfect lighting. They are to capture the current moment and for personal enjoyment, not necessarily "art".
Research and development continues to refine the lighting, optics, sensors, processing, storage, display, and software used in digital photography. Here are a few examples:
Other areas of progress include improved sensors, more powerful software, advanced camera processors (sometimes using more than one processor, e.g., the Canon 7d camera has 2 Digic 4 processors), enlarged gamut displays, built-in GPS and WiFi, and computer-controlled lighting.