Today when capturing photographic images they
turn into a digital format which later will get upload into a computer to be
printed out, forwarded as an attachment on an email or to be posted on the
internet.
There are two types of electronic devices
that can digitally capture images; the digital camera and the scanner.
Digital Camera
The digital camera is the most popular way of
capturing photographic image. The image is stored on an internal memory or on a
SD card (these SD cards can have the capacity up to 32 gigabytes but they are
small as a fingernail).
The data of a captured images are in
mega pixels which are light sensitive sensor grids measured in pixels; the
higher the mega pixels the better the resolution of the taken pictures.
when the images are captured they only grayscale. RGB filters are placed on top of the CCD sensor to add colour.
Transferring images to my computer is as easy as taking the pictures, simply by using an USB connector or having a removable storage device. Also most cameras can record digital videos.
Transferring images to my computer is as easy as taking the pictures, simply by using an USB connector or having a removable storage device. Also most cameras can record digital videos.
Digital cameras uses the primary colours of
red, green and blue (RGB) because daylight is made of RGB, computers use RGB to
display images on the monitor and the human eye use RGB to display light and
colours.
Scanner
Scanners don’t capture photographic images
like the digital camera but what they do is that they make digital copies of
existing images (old photographs, magazines, comics, documents etc.).
The images are scanned in DPI (dots per
inch). Some scanners allow users to preview image before they scan it into
their computer. Scanners can easily upload images into computers with an USB
port the user later can edit the image using graphic editing software.
How
is image captured? Well the user places a document on the class and then closes
the lid. Next the xenon light in the scanner illuminates the documents and
the belt pulls the lamp to illuminate the whole document making the
light bounce back through a series of mirrors, lenses and filters which the
scanner’s software assembles the image together and uploads the image to be
edited on the computer.
Most scanned images come out as raster images
either bitmaps of TIFF images.
I got this information from http://curiosity.discovery.com/question/how-does-scanner-capture-image
I also got this video from the same webpage. About uploading images onto the computer.
I also got this video from the same webpage. About uploading images onto the computer.
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