| Compressing Pictures Compressing a picture
means you are discarding excess information in order to make a file as
small as possible. The physical size (expressed in pixels) of the
image remains the same while the file size (expressed in KB) is reduced.
For example the original image used in these tutorials has a file
size of 787KB. After the image has been compressed the file size
is 54.9KB. The smaller the file size the faster an image will be
displayed on the web. The following are the download times for the
two file sizes.
| |
File Size |
56Kb modem
(common dialup) |
T1, DSL, broadband
(on campus connection) |
|
| |
787 KB |
1 minute 55 seconds |
47 seconds |
|
| |
54.9 KB |
8 seconds |
3 seconds |
|
Reducing the file size of an image can also be useful
when using PowerPoint. Smaller files place less demands on system
resources and can enhance the speed and performance of a presentation.
If you are intending to print an image, the image
shouldn't be compressed. The best quality images for printing
require the excess information that compressing an image removes.
To compress an image file size, click on the Compress
Pictures link in the Edit control panel.
The Compress pictures setting presents four default settings.
In this example the compression for Web pages has been selected.
At the bottom of the column you have an estimate of what the new files
size will be.
To complete the compression procedure click on the OK button.
|
