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When creating a web page it is advisable to use the web-safe spectrum in order to ensure that the page looks the same or similar when seen on different computers.
If that is not done there is a possibility of 'dotted mixing' of two web-safe colours on some screens
| Web-safe spectrum contains 216 colours which can be displayed on PCs and Macs through Netscape Navigator and Internet Explorer, if the screen is set to 256 colours. You can find more about the web-safe colour spectrum on the Internet.
Each colour in a computer is coded, most often in a hexadecimal number. The usual coding system is RGB (Red Green Blue), in which the colour is decomposed into three complementary colours (red, green, blue) and adapted for colour projectors. Number from 0-255, hexadecimal FF, determines the brightness intensity of each top. With such marking #00 FF 00 is code for red (FF = 255, full red colour intensity, green and blue 0), #00 FF 00 for green (red off, green = 255, full intensity, blue off), and #00 00 FF for blue (red and green off, blue = 255, full intensity)
The described encoding enables the display of more than 67 108 864 different colours on the screen and is most often referred to as "millions of colours".
Lately there has been more and more talk about accessibility of pages to people with special needs. Vischeck colour-blindness simulator simulates what the page will look like to a colour blind person.
Simulator can be found on www.visichek.com.
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