Types of Images
There are two basic types of digital
image file formats. They are vector-,
raster format. These will be described
below. If you have any questions please
contact us.
Vector Format
An image stored in a vector format is an
images defined by mathematically lines,
curves, circles etc, which are stored as
mathematical formulas. Compared to
raster images
only the formulas are stored. This makes
the size of the file very small. The
images don't loose focus when you zoom,
since the lines are re-rendered.
A vector image gives a very high
quality, it requires small storage space
and is easy to edit. That's why you
should always try to save your vector
images in a vector format. It is not
possible to save photos, scanned images
etc in a vector format.
 Examples
of vector images are drawings, diagrams
and illustrations.
Picture 1. Enlargement of a vector
image. The quality is still good.
A raster image is made up by small dots,
known as pixels in different colors. The
dots create a pattern which forms the
image. The pattern will show if you take
a very close look at the image.
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Picture 2. Enlargement of a
raster image. |
Drawings, photos, images etc, which
shall be used in a document need to be
transformed into a digital format.
This is done by scanning the image or
take a photo with a digital camera. The
image is then stored as a raster file,
i.e. dot-pattern image.
Picture 3. Enlargement of a raster
image. The quality is not improved.
It is the art of converting raster
images to line art images format. Line
art images are size independent. That
means it can be scaled up and down
without losing any quality.
The image will be of same quality no
matter what size it is being scaled. To
explain it better is to differentiate it
to the raster image (bitmap image).
Bitmap artwork is comprised of dots
(pixels) that represent a graphic image,
with each bit or group of bits
corresponding to a pixel in the image.
When bitmap image is enlarged, it
produces jagged edge and graininess,
which is not print friendly. The bitmap
file is comprised of a series of dots of
inch(dpi) and when you enlarge a bitmap,
rather than more dots being added, the
existing dots are simply enlarged. The
larger the dots get, the blurrier the
image will be. Examples of Bitmap images
are JPG, TIFF, BMP and GIF.
While vector artwork is comprised of
lines (wireframe) that represent the
objects. Vector images are usually
created with the drawing program such as
CorelDraw, Adobe Illustrator or
Freehand. Increase or reduction in size
will produce no pixelization. The
combination of one of these programs
with an expert digital artist can create
a beautiful artwork that can be used on
print articles.
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Bitmap enlarged to 300 % |
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Vector enlarged to 300 % |
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Resolution Independent : A vectorised
images has no jaggedness, no loss in
detail and can be printed at any
resolution
Size Independent : The image can be
scaled up or down without any loss in
quality.
We can output to the following file
types :
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CDR - Coreldraw |
CDT - Coreldraw Template |
CGM - Computer Graphics Metafile
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AI - Adobe Illustrator |
WPG - Corel Wordperfect Graphic |
EMF - Enhanced Windows Metafile |
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WMF - Windows Metafile |
CMX - Corel Presentation
Exchange |
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Vectorizing is very used for
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Image Secets
