|There are several
ways of acquiring images. The three modes of input that we will review
are images obtained using a 35mm camera, images from a digital camera
and images found on the Web. Let's begin with the old-fashioned method
of using a 35mm camera. All of us are familiar with photo albums.
Now rather than just taking photos and putting them in an album, we
can scan in these photos and put them on our web pages or e-mail them
to our friends. Scanning images is easy. The software we will be using
to demonstrate the ease with which you can scan and manipulate images
is Adobe Photoshop 5.0 LE. Your computer will also need the driver
software for the scanner that you will be using. The driver software
is usually included with the scanner. The software contains plug-ins
that will be used by other software on your computer.
You will need
to locate and open the Adobe Photoshop software on your hard drive
or under the Apple Menu.
Next you will
place the item to be scanned on the bed of the scanner. To do this,
lift the lid of the scanner and align the item with the designated
markings. Place the item face down on the glass.
Once the software is open you will go to the File menu, Import
and Twain Acquire.
The twain acquire
will bring up a preview screen and/or settings screen. The appearance
of the preview/settings screen may be different from those illustrated
below, depending upon the type of scanner you are using. To scan
in the image below, an EPSON scanner was used. After the twain acquire,
the following Epson screen will appear followed by the preview/scan
this point you scan select scan or you may wish to change some of
the settings. To see more of the options that can be changed click
the Advanced button.
you click the Advanced button, the following window will open. The
settings may need to be changed, depending upon what the purpose of
the scanned image will be. The settings you might want to change are
the Destination and Resolution. With this particular scanner, when
you change the Destination, the Resolution will automatically change
to the appropriate dpi. Click to pull down the Destination menu and
you can designate whether the image will be used for a web page or
if it will be printed. When you do this, notice that the Resolution
changes. What dpi setting is associated with Screen/Web?
such as the MICROTEK scanner, require you to manually select the
correct dpi. For those types of scanners, use the following guidelines:
to be used on a web page:
to be printed out:
- A 300 dpi
printer - scan with a resolution of 100-120 dpi.
- A 500-725
dpi printer - scan with a resolution of 150 dpi.
Once the dpi
has been set, click the preview button to determine how the image
progress window will appear.
If the preview
image is satisfactory, click the scan button.
scan progress window will appear, followed by the scanned image.
Once you have
scanned the image, click on "File" and then "Save
As" to save the scanned document. Give the photo a name for
example, "lighthouse.jpg." Photos should be saved as JPEG
format and drawings should be saved as GIF format.
earlier, the preview/settings windows may appear different depending
upon the type of scanner used. The following image was scanned using
a MICROTEK scanner. Note, you can select the exact part of the image
you wish to scan by dragging the selection border.
Once you have
scanned and saved the image, you can insert the image into a web
page or you can open it and do some
of acquiring images is through the use of a digital camera. There
are many different types of digital cameras. Depending upon which
type of camera you are using, the way in which you transfer the images
from the camera to the computer may be different. Some cameras have
internal non-removable storage. To get the images from this type of
camera onto your computer, you will need to hook a cable from the
camera to the computer. Another type of camera stores images on a
floppy disk. To transfer the images to the computer, simply remove
the floppy disk from the camera and insert it into the computer floppy
drive and retrieve the images. There are other digital cameras that
store images on various media such as compact flash cards, smart media
cards and memory sticks. For information on how to transfer images
from all these different types of digital cameras to the computer,
and go to the website on Digital
The third way
to acquire images is to borrow them from another website. Not all
images on the Web are free to use. Special rules apply for education
because of the Fair Use Section of the Copyright Law. Images from
government web sites are generally free for use, but you must still
check for a copyright notice. For all others, whether you download
their image or put it on your site by linking to it, you must write
a letter to ask for permission. Keep the letter on file. The following
link contains some helpful information on copyright as well as a
sample form letter you can fill in to request permission to use
to Web Sites Containing Science Images