Graphics - Obtaining Digital Images
Many people wish to enhance the look
of their website and/or PowerPoints by adding pictures or other
images. There are a number of ways to do this:
- Scanning images
- Extracting images from the web
- Using a digital camera
Scanning
You may wish to use pictures or
images that have already been processed, such as an image from a
text book or a photograph. In this case you will use a scanner to
capture the image in order to insert it into your project.
When scanning an image, the
resolution you choose depends on the way that you intend to use the
image, or how it will be displayed.
If you are scanning an image for use
on the web or in a presentation, you may wish to 'blow-up' the image
by scanning it at a resolution higher than 72 dpi (dots per inch).
Scanning at 72 dpi. is good for things that are going on the web
or in a power point presentation that are not going to be enlarged.
Computer screens display at 72 dpi., therefore, small images that
are scanned at higher resolution will be displayed larger on the
computer screen. If the image you are scanning is going to be printed
scanning at 150 dpi., or even 300 dpi may be more appropriate.
 to
see a viewlet on scanning an image
Extracting from the Web
When extracting images from the web
there are two ways to save an image. If the image is built in a
table, or has more than one part to it, instead of saving each part
and rebuilding it you can copy the whole screen (PrtScn), or copy
the active screen (Alt +PrtScn), then crop or resize your image
in a photo editor (see Modify Images) and
then paste it (Ctrl+V) directly into your document. For Single images,
simply right-click and save as.
to
learn how to save images from the web.
When using pictures and other images
from the web, you must be very careful of
Copyright Issues. Copyrights are put in place in order
to protect the right of the author's original work. If the
site does not specify 'free images' be sure to follow the proper
steps necessary to gain permission from the author so that you may
use it. If you are unsure, contact the owner of the site from
which you wish to extract the image.
to
learn more about copyright issues.
Digital Camera
Using images from a digital camera
are too big to put directly on the web or into a PowerPoint presentation
even when you take the pictures on a lower resolution setting, especially
if the format of the images are tiff which are much larger than
jpg.
Obtaining images from a digital camera
is very easy and straight forward. These instructions should
be outlined in the cameras instruction manual. Most cameras
(including those from Edtech), will prompt you with a message when
you connect them to your computer.
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