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
RGB systems permit a total of 16,777,216 colors. This is achieved by combining varying intensities of the three primary colors: red, green, and blue, with each color channel typically having 256 possible intensity levels (ranging from 0 to 255). When these levels are combined (256 x 256 x 256), it results in the vast palette of over 16 million colors.
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, . . .
To represent 256 colors, you need a minimum of 8 bits. This is because 2^8 equals 256, meaning each of the 256 possible values can be represented by an 8-bit binary number. Each bit can be either 0 or 1, allowing for a total of 256 unique combinations.