1. Portfolio Task 5
Imaging Presentations
By Jakki Oh

2. Definitions
Digital imaging : Is an image on the computer which
communicates meaning or information digitally.
Raster images : These images are also known as bitmap images,
and are made on the computer using pixels. Raster images are
best for photographic images.
Vector images : These images are made on the computer using
mathematical calculations. Vector images are best for making
simple geometric shapes.

3. Raster image
You can use a raster image to create any pixilated images. An example of this
is Minecraft player skins, which is made purely out of altered colours of
different pixels.
NOTE: That quality of the image below is resized, and loses it’s resolution

4. Vector Image
Vector images are more able to be resized at a better resolution. Logos which use
the basic shapes are very detailed and cannot afford to lose resolution. Vector
Images are based on computer mathematical processes.

5. Pro’s + Con’s
Pro’s Con’s
Raster images Vector Images Raster Images Vector Images
Can reproduce Small file size Resolution Less file formats
subtle continuous downloads quickly dependant
subtle changes in
colour tone
Larger files sizes Smaller file sizes Format is only used Not suitable for
than Vector than Raster for a digital camera photo-realistic
or scanner images
Suitable for photo- Format is used Only 2 file formats
realistic images when images are To be able to save
created on the in
computer

6. Image File Formats
A file format is used to attatch bits of information onto a file which allows the
Computer to determine the type of data stored in the file.
There are 5 types of image file formats which are;
• .bmp
• .tif
• .gif
• .jpeg
• .png

7. Advantages and Disadvantages of
image file formts
Advantages Disadvantages Use
JPEG Good for Archiving Compression is For natural
and transferring cumulative- photographic
across different removes data and images
media types reduces quality of
image
GIF Cross platform and Limited colour For images with
compressed, good depth, not suitable large areas and
for websites, made for natural or solid colours like
for online purposes photographic geometric shapes,
images logos, text.
TIFF Is high-quality Not suitable for the To save images that
images and saves internet and need to be read by
full colour images websites as the file devices other than
size is too large. computers

8. References
Files from the moodle;
• Image File Formats
• Raster v Vector
Google logo from Google
Education Services logo from moodle
Minecraft Skin from PlanetMinecraft Website