Transcript File Types

File Types
Terms
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Multimedia- the integration of text, sound,
video and/or animation into a document
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Letters, brochures, newsletters, web pages or
presentations.
Graphics- everything on a page that is not
text
Multimedia and Image Management choices
communicate a message and business
success depends on the effectiveness of
that message.
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Image Formats
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Image programs save graphics with specific
extensions indicating the file format.
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Extensions are 2-4 letters following the . At the
end of a file name
Ex. Picture.jpg
Each program has a native format specific to
it.
Images should be saved in their native format
for later editing.
Different file formats are appropriate for
different situations so knowing the difference
between them is important.
Painting Programs
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Painting programs create images by using
pixels.
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Pixels(Picture element)- a data representation of a
specific color at a specific location on a grid.
I.E. small squares with each pixel assigned a
color.
Painting programs are usually easier to use
but do not give as high quality of results as
drawing programs.
Examples of Painting Programs
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Microsoft Paint
Adobe Photoshop
Painting (cont’d)
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Painting programs create bitmap graphics
made of pixels.
Each pixel has a defined color, size and place
in the image
Sharpness is determined by the density of the
pixels and the density determines the
resolution.
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Resolution- Dots per inch or the numbers of pixels
in rows and columns
The higher the resolution, the better your image
will appear or print.
Bitmapped Images
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Bitmap images(.bmp) are usually used in
word processing documents or ones that run
Windows.
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They are limited to 256 colors but are still rather
large files.
Tagged Image File Format (.tif) files work
well in all environments
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They are also very large and often used in print
documents
Uncompressed and can show 16 million colors
Some scanners and digital cameras produce TIFF
files.
Images for the Web
The time it takes to download a graphic on the
Internet depends on the size of the file.
Algorithms have been written to improve
download speed by reducing or compressing
the file
 Compression-process of reducing the size of
an image
 2 types
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Lossless- reduces file size without losing any pixel
information
Lossy- changes pixels by removing pixels it
considers not essential.
GIF
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Graphics Interchange Format(GIF)
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Developed by CompuServe in 1994
Other software companies must pay royalties to
them to use file format
Only use 256 colors and are very small
Used to create line drawings, images with
transparent backgrounds an animated figures.
Not good for images that require great color
depth, like pictures
GIF compression is loseless.
2 choices
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Interlaced- image loads onto Web page in stages until it
reaches full resolution
Noninterlaced- loads image from top down until image is
complete.
Other file types
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.JPG(jay-peg)
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Uses 16 million colors
Reproduces the quality, color and detail found in
photographs.
Most digital cameras use to save graphics
Compression formula allows you to choose
amount of compression to balance quality with
size
.PNG
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Uses 16 million colors
Not supported by all web browsers
Drawing Programs
Drawing programs create images made of
mathematically defined lines and curves
called vectors.
 Vector- an image created by using a series of
mathematically defined lines and curves
rather than pixels.
 Makes images easier to resize or scale.
 Unlike bitmap images, quality remains same
despite scaling.
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Scaling-enlarging or reducing image
Smoother than a bitmap image
More on Drawing
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Once graphic is completed, it can be saved as
a bitmap(rastor) image, called rasterizing for
use on the Internet
Are smaller than bitmaps but do not show
gradations of color
Common vector file formats
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.cdr- CorelDraw
.ai Adobe Illustrator
.swf Shockwave Flash
Comparison Activity
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Create a drawing in Adobe Illustrator
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Make sure that your drawing has
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color
At least 3 elements
Save the file as an .ai file called vector example
Then Save for Web and save file under same name but as a
.gif or .jpg.
Create a similar drawing with the same requirements
in Photoshop
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Save the file as a .psd document called raster example.
Then Save for Web and save file under same name but as a
.gif or .jpg.
Activity Part 2
After you have created each file, answer the following:
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What is the size of each file? Which is bigger, why?
 To determine size, open My Computer and point to the file.
Which file is better quality?
Which file would be best for the web?
Which file would be best for print?
Zoom each file to 800%. How does each file change, if it changes?
List 2 advantages of vector art.
List 2 advantages of raster images.
List 3 file types and give 1 pro and 1 con of each.
What is the difference between PhotoShop and Illustrator? Which is easier
to use, why? Answer in at least 3 sentences.
Save the word file with the answers to the questions as
vectorvsbit_firstnameli