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Printing II

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Wai Leong

on 27 April 2015

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Transcript of Printing II

As digital files can be manipulated on the computer, traditional film will always be more acceptable as evidence in Court, compared to digital pictures which may have been edited.
Simply because digital pictures are held on memory, of a memory card becomes corrupted or unreadable, all of those images will become lost unless they are backed up on a computer.

Security of Image

If you don’t have the skill.
Eye for colour, detail and composition, imagination, creativity, or ability to get these elements right, no amount of advance digital technology will improve your image or photographs.

Important info – digital camera

For example, a camera that makes a 5616×3744 pixel image 21,026 304 finished image pixels) typically uses a few extra rows and columns of sensor elements and is commonly said to have ”21.02 megapixels" or ”21 megapixels", depending on whether the number reported is the "effective" or the "total" pixel count.

What is Megapixel?

What is Megapixel?

Same as film camera, digital camera obtain a controlled amount and intensity of light over a certain period of time through a lens, and then project it onto a recording device.

How Exactly do Digital Cameras Work?

Too much light can over-expose the film, which will cause too many light sensitive grains on the film to change and affect the image.
After exposure, the film is removed and chemically treated to show the image, a process known as developing. Because the chemical treatment produces permanent change in the light sensitive grains, it makes them visible, hence producing the image.

The Image Quality Controversy

Using a film, the light is focused onto light sensitive chemicals on the film.
The shutter ensures that the light strikes the film surface for only the shortest of times, acting as a valve to allow the light through briefly.
When the light strikes the film, the light-sensitive chemical undergoes a chemical change, and the amount of light that has been allowed to strike the film affects the amount of change that occurs.

The Image Quality Controversy

This is all carried out as a self-contained, self-run, self-correcting process. The images are captured as an active process.

The Image Quality Controversy

When you are using digital camera:
The digital imaging sensor catches the light and carries out color interpolation in 8X8 grids

It converts the light to analogue charges
It converts the analogue charges to digital

The Image Quality Controversy

Picture Quality

Because digital cameras store images in memory and do not use film, they do not have the different resolutions that traditional film offers.


However, there are some important differences. In fact, modern digital cameras have many advantages over film based cameras that some photographers may be unaware of.
Great photographs will always be about good composition, impact, spectacular lighting and content.

Traditional vs Digital Camera

A megapixel (MP) is a million pixels; the term is used not only for the number of pixels in an image, but also to express the number of image sensor elements of digital cameras or the number of display elements of digital displays.

What is Megapixel?

The file that is produced can be read by imaging software and printed as a photograph.
Understanding pixels and resolution is the key to editing your digital images and printing them for family and friends.

How Exactly do Digital Cameras Work?

Points of light are detected by the sensor and each point is assigned a value representing color and intensity. Each point is called a pixel.
The collection of pixels created, are saved onto an electronic media, in the form of a flashcard or memory card.

How Exactly do Digital Cameras Work?

Digital cameras use photosensitive electronics, either charge-coupled device (CCD) or complementary metal–oxide–semiconductor (CMOS) image sensors, consisting of a large number of single sensor elements, each of which records a measured intensity level.

How Exactly do Digital Cameras Work?

Digital imaging sensors do not ever need to match the “equivalent pixel resolution” of film, because they use an entirely different process, and they work according to different principles.

The Image Quality Controversy

Because the digital camera stores photographs in memory using sensors and electronics, power is needed in order to operate them.
Therefore need to carry batteries with you, because it’s not possible to operate without.

Batteries and Chargers

Digital camera do not use film, however a miniature memory card is used within a digital camera to store images, and instead od film, a digital sensor is used to capture the images.

Traditional vs Digital Camera

Store image digitally on a memory card, rather than recording them on photographic film.
Pictures from digital camera are downloaded onto a computer, where they can then be stored, filed, edited or manipulated with a graphics software programme before printing.

What is Digital Camera

Lecturer & Tutorial :
Ms. Leong Wai Kit

Semester 4, Year 2

Many people still believe that film camera pictures are of superior quality to that of digital pictures.
This is up for debate and questionable; however, the belief still persists with some photographers today.

Traditional film is available in 35mm, half-format, full-format etc. and under the right conditions, resolution can be varied by the correct selection of film. This is not possible on a digital camera.

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