2. Raster Graphics
• Raster graphics are digital images created or captured.
• They are made up of bitmaps, bitmaps are made up of
color recording squares called pixels.
• If you expand the raster graphic the detail of the picture
gets worse as each pixel expands and the extra detail is
not filled in, because it has a fixed resolution.
3. Vector Graphics
• Vectors/paths are defined by a start and an end points.
• Can be scaled big and small as Vectors have no loss in
definition.
• Vector graphics are scalable, if you resize them, they do not
lose quality. The quality of an image is the same if the image is
big or small.
5. JPEG
Stands For Joint Photographic Experts Group
Used For/Example Photographs and web format
Compression technique for colour
images.
Advantage Suitable for high quality images
Uses lossy compression
Widely used so is supported widely
Reduce file sizes to about 5% of their
normal size
Good for photographs, as they can do
full-colour information
Disadvantage It doesn't’t support transparency
Any sharp edges tend to come out
blurry when you transfer them
6. TIFF
Stands For Tagged Image File Format
Used For/Example Used for making magazines
Advantage Can be used to same multiple pages to
one document
Has the option of lossless compression
High quality images
This file format can also be recognised
by most computers; compatible with
both MAC and PC’s.
Disadvantage Not supported everywhere
Uses big file sizes
A tiff is also a specialist file which
means it requires certain programmes
to open the document.
7. GIF
Stands For Graphics Interchange Format
Used For/Example Used for short digital animations
Advantage uses lossless compression
suitable for logos, flat areas of color
with well defined regions
suitable for icons with few colors
support for transparency
suitable for small animations
Disadvantage Uses big file sizes
Once the animation has been coded
into the GIF there is no way to go back
and edit the image.
8. BMP
Stands For Bitmap image file
Used For/Example is a raster graphics image file format
used to store bitmap digital images.
Advantage Lossless compression
Good quality images
These files may translate well to dot-
format output devices such as CRT’s
and printers. They files may be easily
created from existing pixel data stored
in an array in memory.
Disadvantage Uses a large file size
Not supported everywhere
They typically don’t scale very well;
shrinking an image can throw away
pixels and change the image in a
unacceptable manner.
10. PSD
Stands For Photoshop Document
Used For/Example Magazine covers
Advantage Saves the image in layers
Page formatting information
Supports transparency
It also opens in Adobe Photoshop CS
so it uses good software to create the
file.
Disadvantage Cannot be displayed on the internet
These files only open in Adobe
Photoshop, therefore if you don’t have
this software you can’t edit or create
them. It is also not suitable for a blog or
website and you can’t always print
these images.
11. AI
Stands For Adobe Illustrator Art
Used For/Example Logos creation
Advantage Can be scaled big and small with no
loss in definition therefore the images
could be of really high quality; it is a
vector graphic. These images will be
suitable to be used on a business card
of website as they are high quality.
Disadvantage Can be difficult to uses and needs
practice to get professional looking
work.
12. FLA
Stands For Flash File
Used For/Example Widely used to create animations and
games
Advantage Uses a small file size
Includes video and sound
They don’t take up a lot of memory and
can be stored on things like USB’s; as
well as animations they can also
include video and sound.
Disadvantage Expensive
Time consuming
Not widely recognised
13. WMF
Stands For Windows Metafile
Used For/Example Used for logos
Advantage Can be scaled big or small
No loss in definition
Files can be saved in to a JPEG form
and placed straight into a Microsoft
word document
Disadvantage Very complex
PowerPoint sometimes does not
support this file format and tends to
glitch, this is very likely with some
types of graphs.
15. Compression
Definition Decreasing the amount of bits
within a picture to reduce the file
size
Advantage It reduces file size as less information
is required to be saved
This means your computer may work
faster and your file transfers will be
quicker.
Disadvantage As less information is being saved,
when the image is expanded the
quality is diminished as each pixel is
expanded
If you send a compressed file; via
email the recipient may not be able to
open it as its compressed.
16. Image Capture
Method Scanner
How is it used for image capture of
graphics
Digitises physical things such as
collages and photographs
Method Camera
How is it used for image capture of
graphics
Taking pictures
Method Graphics Tablet
How is it used for image capture of
graphics
Technology that allows you to control
the mouse like a pen for activities such
as drawing
17. Optimising
Why would you optimise? To upload images to the internet
How can you optimise?
Reducing image size
Reducing bit depth
Reducing resolution
Compressing images
Advantage to optimising Leads to a faster upload of images to
the internet
Disadvantage to optimising Optimising an image reduces the
amount of pixel information, usually
until images are no more than 500
pixels wide.
19. File Size
What could affect a Working Scale
(Photoshop) document file size?
The larger the work scale the larger
the file size
How could you reduce the file size
of a Working Scale document
without affecting quality?
Optimise
What is an advantage of scaling up
images before exporting?
A faster up load
What is a disadvantage of scaling
up images before exporting?
Lower quality
