2. Pixels
A Pixel or pel in digital imaging is a physical point in a Rasta image
In a display device its is the smallest addressable element
The pixel address corresponds to its physical coordination
Each pixel is a sample of an original image
Each pixel intensity is variable
3. Pixels
Picture element is what the term pixel actually stands for.
The way they make up the images on digital is by using all these little tiny
dots.
A matrix of maybe millions of pixels is divided up on screen.
Even though pixels can only make one colour at a time they often mix
together to make various shades.
The number of bits used to represent it will determine how many colours
a pixel can be,
4. Colour and pixels
The number of bits per pixel that can be displayed on a computer screen is what
defines colour depth
colour depth No of colours
1 bit colour 2
4 bit colour 16
8 bit colour 256
24 bit colour true colour
More colours can be displayed the more bits each pixel has
The examples of this are shown above
5. Cameras – converting light
Digital cameras have a sensor that converts light into electric charges
This is clearly about alternative then film
6. Cameras – converting light
Digital cameras a far more advanced then film
They convert light into electrical charges via a sensor
In the camera there is a sensor made out of silicon
A digital camera using the lens takes light and puts it on to the sensor
Each photo site on the sensor absorbs photons
It also releases electrons trough the photoelectric effect
Electrons are emitted from matter in the photo electric effect
7. Cameras – converting light
A charge coupled device is the image sensor deployed by most typical
cameras
Some different cameras use alternative technology like complementary
metal oxide semiconductor
They both are shortened down as ccd or cmos
Ccd and cmos bothe convert light into electrons
