On older Macintosh and Windows computers, the graphics hardware of the time was typically limited to 256 colors. Each of the operating systems used several "reserved" system colors, not all of which overlapped. So 40 colors that were or might be used by an operating system were reserved and the rest were free to be used on web pages.
256 *Actually there are 216 web-safe colors in a palette, not 256*
216 is but 256 isn't.
256
Traditionally, 256 browser safe colors/colours.
usually for company's logos and graphics with less then 256 colors,.gif support transparency but can display only 256 colors
I'm no expert, but as I understand it, it depends ... for a computer running a Microsoft Windows product right-click on the background of the Desktop. Select Properties then the Settings tab. The Colors drop-down menu will inform you of your 'potential' colors. 256 is 256; high color 16-bit is 216 or about 65,000 colors; true color 32-bit is 232 or about 4 trillion colors. Some residential printers will vary color levels of their 4 inks in 256 stepped increments and be able to generate 'true color' quality, but this color will not necessarily match the color on the monitor. Good luck.
256 to the power of 2 equals 65,536
This is a homework question, so I won't answer it directly.But a two-digit hexadecimal number can have 256 different values - 00 to FF - so with three of them you can combine any of the 256 values of the first color with any of the 256 values of the second and third color, for a total of 256 * 256 * 256 different combinations.Even though you can specify that many colors, it does not necessarily mean that the computer screen can show them all. See related link for more on web colors.
An 8 bit colour display can show 256 colours.
208, 216, 224, 232, 240, 248, 256, 264, 272, . . .
Hexadecimal colors give Web Designers 16,277,216 colors. This is a far greater number of colors than are named in the CSS and HTML specification. That said, it is the exact same as the number of colors available using rgb() notation. The numbers are just in a different format. For instance #ffffff is the same as rgb(256, 256, 256).
You haven't reloaded the video card drivers after installing Windows 2000. If your video card drivers weren't included with Windows 2000, you need to load them from the drivers CD that came with your PC or with the video card, if you bought it seperately. Which video card you have installed is something that YOU need to figure out. Once you get the correct drivers loaded, you should then be able to change your colors to 256 or higher.