Information Technology Reference
In-Depth Information
range of zero to 255. When all the white switches are set at zero the room is
dark. What all the light switches are set to 255, the room is lit at full intensity.
Once you begin to use image-editing applications such as Adobe Photoshop
and Macromedia fireworks, you begin to explore computer color within your
graphics and photographs.
When discussing color usage, full color or RGB color is present in photographic
JPG files and other created artwork. Full color images should not be saved as
GIF files because of the limited number of colors. By having limited colors, the
full color image will represent the true colors using the existing Web palette of
216 colors. This creates a poor, dithered, and ugly image. That is why it is very
important to use the right file format for each specific graphic.
When converting print images to the Web, it's important that you do not use the
CMYK color model for anything including graphics. The CMYK model is not
a monitor friendly color space. The CMYK graphics cannot be seen in CMYK
on the Internet. They can only be represented by the RGB color model or the
Web safe (indexed) color model.
Here are the rules for Web color:
•
Full color images (RGB palette) and photos are saved as JPG.
•
Flat graphics (Web 216 palette) with limited color are saved as GIF files.
•
For Page backgrounds use the Web safe palette (Web 216 palette) in all
computer graphics, multimedia, and Web development applications.
Now, let's discuss Web page and graphic size.
Size
Web pages are measured in pixels. Pixels are the unit of measurement for the
screen. A Web page can literally be any size. Standard Web pages usually fit
into a few sizes:
•
W
H
×
•
600
800
×
