Friday, 20 July 2018

What is a Digital Image?

A digital photo is made up of a series of pixels (picture elements). Most of today’s digital photos use a “24-bit RGB” system to color each pixel.

When using digital equipment to capture, store, modify and view photographic images, they must first be converted to a set of numbers in a process called digitization or scanning. Computers are very good at storing and manipulating numbers, so once your image has been digitized you can use your computer to archive, examine, alter, display, transmit, or print your photographs in an incredible variety of ways.

Pixels
Digital images are composed of pixels (short for picture elements). Each pixel represents the color (or grey level for black and white photos) at a single point in the image, so a pixel is like a tiny dot of a particular color. By measuring the color of an image at a large number of points, we can create a digital approximation of the image from which a copy of the original can be reconstructed. Pixels are a little like grain particles in a conventional photographic image, but arranged in a regular pattern of rows and columns and store information somewhat differently.
Types of Digital Images
For photographic purposes, there are two important types of digital images— color and black and white. Colour images are made up of colored pixels while black and white images are made of pixels in different shades of grey.

Resolution
The density of pixels in an image is referred to as its resolution. The higher the resolution, the more information the image contains. If we keep the image size the same and increase the resolution, the image gets sharper and more detailed. Alternatively, with a higher resolution image, we can produce a larger image with the same amount of detail.

Types of Photography



There are many types of photography. The various types of photography make use of various techniques and the different types of photographer use their skill in their particular filed of expertise.

Photographic work can be divided into dozens of categories, many with lots of sub-categories. The following list describes some common types of photography.

1.Landscape Photography
Landscape photography shows spaces within the world. It typically captures the nature but can also focus on man-made features.

2.Wildlife Photography
Wildlife photography deals with documenting wildlife in their natural habitat. It is one of the more challenging forms of photography.

3 . Aerial photography
An aerial photograph is any photograph taken from the air. Usually the camera will be supported by platforms like fixed-wing aircraft, helicopters, multirotor Unmanned Aircraft Systems (UAS), balloons, blimps and dirigibles, rockets, pigeons, kites, parachutes, stand-alone telescoping and vehicle-mounted poles.

4.Sports / Action Photography
Sports photography is a branch of photojournalism. It refers to the genre of photography that covers all types of sports.

5.Portrait Photography
Portrait photography or portraiture captures images of a person or group of people that displays the expression, personality, and mood of the subject. The focus of the photograph is usually the person’s face, although the entire body and the background or context may be included.

6.Architectural Photography
Architectural photography is the photographing of buildings and similar structures.

7 . Fashion Photography
Fashion photography is a genre of photography devoted to displaying clothing and other fashion items. Fashion photography is most often conducted for advertisements or fashion magazines.

8.Macro Photography
Macro photography is extreme close-up photography, usually of very small subjects, in which the size of the subject in the photograph is greater than its original size.

Basics of Photography - Camera’s Manual Settings



There are three pillars of photography. One is Aperture and the other two being Shutter speed and ISO.

Aperture
If you look at the lens, you can see the opening where light comes through. When you adjust your aperture settings, you’ll see that opening gets bigger and smaller. The larger the opening, or wider the aperture, the more light you let in with each exposure. The smaller the opening, or narrower the aperture, the less light you let in. Why would you ever want a narrow aperture if a wider one lets in more light? Aside from those situations where you have too much light and want to let less of it in, narrowing the aperture means more of the photograph will appear to be in focus. 

For example, a narrow aperture is great for landscapes. A wider aperture means less of the photograph will be in focus, which is something that’s generally visually pleasing and isn’t seen as a downside. Aperture is represented in f-stops. A lower number, like f/1.8, denotes a wider aperture, and a higher number, like f/22, denotes a narrower aperture.

Shutter Speed
When you press the shutter button on your camera and take a picture, the aperture blades take a specific amount of time to close. This amount of time is known as shutter speed. Generally it is a fraction of a second. If you’re capturing fast motion it needs to be at most 1/300th of a second. If you’re not capturing any motion, you can sometimes get away with as long of an exposure as 1/30th of a second. When you increase your shutter speed—the length of time where the sensor is exposed to light—two important things happen.

First, the sensor is exposed to more light because it’s been given more time. This is useful in low light situations. Second, the sensor is subject to more motion which causes motion blur. This can happen either because your subject is in motion or because you cannot hold the camera still.

ISO
ISO is the level of sensitivity of the camera to available light. It is the digital equivalent (or approximation) of film speed. The lower the ISO number, the less sensitive it is to the light. A higher ISO number increases the sensitivity of your camera. The component within your camera that can change sensitivity is called “image sensor” or simply “sensor”. It is the most important (and most expensive) part of a camera. It is responsible for gathering light and transforming it into an image. With increased sensitivity, your camera sensor can capture images in low-light environments without using flash. But higher sensitivity has a negative side too – it adds grain or “noise” to the pictures. The higher you increase your ISO, the more noise you get.

Basics of Photography: Composition and Technique



Rule of Thirds
The rule of thirds is the simplest rule of com-position. All you do is take your frame and overlay a grid of nine equal sections. This means you split the vertical space into three parts and the horizontal space into three parts. Generally you want to place important elements where the grid intersects. The intersection points are where the eye tends to go first, so it’s useful to place your subject on one of those points. People generally tend to aim for the centre, but that’s often less effective.

Perspective
Photographing your subject straight-on is sometimes the right choice. Also you can create visual impact by moving the camera left, right, above, and below. When you’re beneath the subject it often makes them/it appear more powerful to the viewer. Conversely, when you’re above the subject it makes them/it appear more diminutive.

Additionally, left and right positioning isn’t as direct and can often make a photograph feel more honest and candid. When capturing a moment, whether it’s staged or not, photographing the subject head-on can often seem a little awkward and end up being less-effective. Of course, you can also combine different positioning elements to create other effects. Try taking photographs of the same subject from different perspectives and see how people interpret them. This is a good way to understand the effects your choices have on the end result.

Parts of a Camera



Camera is made up of many parts, but there are a few in particular that we want to look at as they are the most important. Here’s a basic overview of the parts:

1.The body
The body is what you see on a camera when the lens is unmounted. While body has little effect on the quality of your photos, it does affect things like ease of use and comfort. If we can’t hold it properly the quality of the images will be poor.

2.The lens
The lens is the eye of the camera. It’s a very complex instrument. Different lenses can provide many different features, so it’s important to know the differences between them.

3.The sensor
The sensor is basically the digital equivalent of film. It means that, like film, the sensor is exposed to light that comes through the lens and it records that exposure. The exposure is then processed and saved to flash memory (generally an SD or Compact Flash card). The caliber and size of the sensor are also very important, as these things significantly affect the quality of your photos.

4.The flash card
Flash card is where you save your images. Flash cards range in read and write speeds as well. A slow card can significantly degrade your camera’s performance.

5.The battery
Camera is just like any other electronic devices. It needs energy to work. So battery is an essential part.

How do DSLR cameras work?



When you look through the viewfinder on the back of the camera, whatever you see is exactly what you are going to get in the photograph. The scene that you are taking a picture of passes through the lens in a form of light into a reflex mirror that sits at a 45 degree angle inside the camera chamber, which then forwards the light vertically to an optical element called a “pent prism”. The pent prism then converts the vertical light to horizontal by redirecting the light through two separate mirrors, right into the viewfinder.

When you take a picture, the reflex mirror swings upwards, blocking the vertical pathway and letting the light directly through. Then, the shutter opens up and the light reaches the image sensor. The shutter remains open for as long as needed for the image sensor to record the image, then the shutter closes and the reflex mirror drops back to the 45 degree angle to continue redirecting the light into the viewfinder.

The camera processor takes the information from the image sensor and converts it into an appropriate format; then writes it into a memory card. The whole process takes very little time and some professional DSLRs can do this 11 times in one second.

Camera - SLR & DSLR



Camera is a tool, a device for recording visual images in the form of photographs, film, or video signals. We know its use. It is actually a box that controls the amount of light that reaches a piece of light sensitive film or other surface inside. The original cameras did not even have a glass lens. 

The first cameras used a tiny hole in the front of the box to allow in light and to focus the image onto the viewing surface. This is the same principle as when children punch a pinhole into a piece of paper in order to watch a solar eclipse projected through the pinhole and onto the ground.

The First Photograph: In 1827, Joseph NicephoreNiepce made the first photographic image with a camera Obscura.



SLR Camera
Single lens reflex cameras (SLR) use a mirror and prism system to allow photographers to accurately see the image that will be captured. This system uses one optical light path whereas previous cameras had two, one through the lens to the film and the other to the viewfinder.

DSLR Camera
DSLR stands for “Digital Single Lens Reflex”. DSLR is a digital camera that uses mirrors to direct light from the lens to the viewfinder, which is a hole on the back of the camera that you look through to see what you are taking a picture of.

Famous Photojournalists



Louis Daguerre was the inventor of the first practical process of photography. In 1829, he formed a partnership with Joseph NicephoreNiepce to improve the process Niepce had developed.

In 1839 after several years of experimentation and Niepce’s death, Daguerre developed a more convenient and effective method of photography, naming it after himself - the daguerreotype.

Some of the great photojournalists of the early picture story era included “Weegee” (Arthur Fellig), W. Eugene Smith and Robert Capa. They became well known for their gripping war pictures. In fact, Capa was killed on assignment in Indochina, and Smith was severely injured on assignment in Japan.

Robert Frank, Steve McCurry, Eddie Adams, Margaret Bourke-White, Dorothea Lange, David Seymour, David Burnett, Robert Doisneau, Henri Cartier-Bresson, Philip Jones Griffiths and Kevin Carter are some of the famous photojournalists in the world.

HomaiVyarawalla was the first woman photojournalist in India. She started her career in 1930s and thereafter received notice at the national level when she moved to Mumbai in 1942 with her family, before moving to Delhi, where in the next thirty years she photographed many political and national leaders, including Gandhi, Nehru, Jinnah, Indira Gandhi and the Nehru-Gandhi family while working as a press photographer.

Other famous Indian photojournalists include, Mayank Austen Soofi, AbulKalam Azad, N. L. Balakrishnan, Ritam Banerjee, Pablo Bartholomew, ArkoDatta, DhavalDhairyawan, Sunil Janah, FarhatBasir Khan, SaadiyaKochar, Kishor Parekh, AltafQadri, Raghu Rai, AchuthanandTanjore Ravi, T. S. Satyan, Subhash Sharma, Dayanita Singh and N. Thiagarajan. Victor George is an unforgettable name in the Photojournalism history of Kerala. He died in 2001 while taking pictures of landslides in Idukki district.

Origin and Growth of Modern Photojournalism


The combination of photography and journalism is known as photojournalism. The term was coined by Frank Luther Mott, historian and dean of the University Of Missouri School Of Journalism. Photojournalism is a form of journalism that uses images in order to tell a news story. It is now usually understood to refer only to still images, but in some cases the term also refers to video used in broadcast journalism. Photos used for journalistic purpose must have timeliness and objectivity. They must be narrative too.

1920-1990 The beginning of modern photojournalism took place in 1925, in Germany. The event was the invention of the first 35 mm camera, the Leica. Before this, a photo of professional quality required bulky equipment. With the invention of Leica, photographers could go just about anywhere and take photos easily.

Added to this was another invention originally from Germany, the photojournalism magazine. Editors and photographers begin to work together to produce an actual story told by pictures and words, or cutlines. Germany’s photo magazines established the concept, but Hitler’s rise to power in 1933 led to suppression and persecution of most of the editors, who generally fled the country. Many came to the United States.

During the Second World War, ‘Life’ launched Nov. 23. 1936, was probably the most influential photojournalism magazine in the world. The most dramatic pictures of the conflict came not so often from the newspapers as from the weekly photojournalism magazines, photos that still are famous today. Many began using handheld cameras made by Graflex camera company during the 1960’s; two have become legendary: the Speed Graphic, and later, Crown Graphic.

Successor to the Graphic by the 1950s was the 120-format camera, usually a Rolleiflex, which provided greater mobility at the expense of smaller negative size. You looked down into the ground-glass viewfinder. But in newspapers, by the Vietnam War era, the camera of choice was the 35--film got better, making the camera easier to use, and the ability to use telephone, wide-angle, and later, zoom lenses made the 35 indispensable, as it still is to most photojournalists today.
The golden age of photojournalism ranged from about 1935 to 1975. Television clearly had a huge impact--to be able to see things live was even more powerful than a photo on paper. Even so, many of the photos we remember so well, the ones that symbolized a time and a place in our world, often were moments captured by still photography.

By the 1990's photojournalists gave up making actual prints, but use computer technology to scan film directly into the design. And by the beginning of the new millennium, photojournalists were no longer using film: digital photography had become universal. Since it is both faster and cheaper it fitted well in an industry preoccupied with both speed and profit. Colour became the standard for “legacy media,” newspapers and magazines, as well as for web news sites. Because colour printing technology requires a higher quality image, photojournalists have had to adapt their methods to accept fewer available light images.


Earlier we used analog cameras which use film as recording medium. Now we have digital cameras which use digital sensors instead of film and flash cards as storage medium. Today’s cameras use glass lenses to focus and capture light much more quickly and to allow us to magnify images. Today’s cameras also have shutters that control the light from reaching the film or sensor with the touch of a button and have powerful flashes to help illuminate scenes. The camera has come a long way from its humble beginnings, but it is still just a box that controls the amount of light that reaches a piece of film. 

In today’s world, photojournalism isn’t something that is heard or spoken of much anymore. With the Internet providing us with places such as YouTube, Deviant Art, and other online sources created just for sharing amateur photography, it’s really no surprise that photojournalism is slowly becoming a dying form of art as well as media.