Graphics unit notes for Information Processess and Technology

1. File Types
Appropriate use of file types

2. Appropriate File Types for
communication
 When we save data to a file we often have
the choice of saving it as a particular type.
 Choosing the correct type depends on
what we want and what others want to use
the file for.

3. What would we choose and when
would we choose it if we want…
 To use Word to type a document with no pictures, but email it to someone
who does not have office?
 To create a database file in Excel to email it to someone to use in an Oracle
Database
 To Create a blueprint drawing of a supermarket to send to an architect who
will need to change specifications of the drawing easily
 To Create a written document that has security features such as non-
printing, non-cut and paste, non-editing?
 To send a email of a highly detailed blueprint drawing that can be easily
modified but is very small in memory size?

4. Bitmap Graphic files
 Bitmap graphics are perhaps the
most common graphics that we
use with computers.
 Bitmap graphics include the .jpeg,
gif and .tiff extension format.
 Why? Because our screens are
basically a grid with many little
dots.

5. Bipmap files
 The grid has a limited number of pixels.
 The more pixels the better the resolution when
you look up close.
 This is what you consider when purchasing a
High Definition vs Standard Definition TV. (Did
you know that Foxtel only broadcasts in SD and
that there is no True HD television broadcast in
Australia. Only when Blue Ray and HD-DV
comes out will we truly experience true High
Definition)

6. Vector Graphic files
 Vector Graphics are different from Bitmap
graphics as the data that makes them up
is not information about individual pixels
but co-ordinates that are joined together
on screen.

7. Primitives
Like a kids dot-to-dot puzzle,
memory would only require 35
points or primitives which the
computer program will join up
to complete, rather than say
10,000 pixels to make up the
image.
Vector Graphics are therefore
much smaller in size than
bitmap images

8. Advantages
 As the image is made up of co-ordinates
that are mathematical in nature, it does
not matter how much you enlarge it. No
image distortion as with bitmaps will take
place

9. Vector Graphic files
The shoot button has been magnified 8x
as a vector image and a bitmap image.
Raster images scale poorly, but vector-
based images can be scaled indefinitely
without degradation.

10. Text files files
.txt or text files are made in
Windows notepad. All word
processors allow a user to save
a file in notepad format.
•Have you noticed that most
help files on cd or dvd are in .txt
format?
•This is because even if XP is
disabled, you can use dos to
open it and read it

11. Using Word to save document as a
text file .txt

12. Delimited Text files
 As every computer in the world can read a
.txt file, it makes sense that most
applications can also read it.
 It makes sense then to choose a delimited
text format to transfer data between
spreadsheets and databases.

13. Delimited text files
 Delimited data uses specific characters
(delimiters) to separate its values. Most
database and spreadsheet programs are able to
read or save data in a delimited format.
 Any character may be used to separate the
values, but the most common characters used
are the comma, tab, vertical bar

14. Saving a comma delimited file in
Excel for import into a Database

15. .pdf (portable document format)
 Anyone may create applications that read and write PDF files without having
to pay royalties to Adobe Systems; Adobe claims that it is an open standard,
licensing them on a royalty-free basis for use in developing software that
complies with its PDF specification.
 Adobe provides a free reader to open .pdf documents. To create documents
you need to purchase their software or other software
 PDF files are most appropriately used to encode the exact look of a
document. While the PDF format can describe very simple one page
documents, it may also be used for many pages, complex documents that
use a variety of different fonts, graphics, colors, and images.