Color Safe PaletteHTML allows web content to include page elements specified in 24 bit True Color. These can include page elements, pictures in True Color (such as PNGs and JPEGs), and pictures in formats with different palettes selected from True Color (such as GIFs).
Obviously, this could lead to a difficulties if the web page content includes more colors than be simultanously displayed on the user's screen (for example, many users may only a have 256 color screen). In these cases, web browsers typical attempt to dither any colors in the content which can not be displayed.
While dithering can often do a reasonable job of simulating more colors than can actually be displayed, it also can produce objectionable effects, particularly when displaying large areas of a solid color. For this reason, browsers on 256 color screens, define a standard palette, known as the "Color Safe Palette" - which consists of colors which will never be dithered. Thus, a web designer can design web pages and graphics using the Color Safe Palette and be assured that the colors will never be dithered.
The Color Safe Palette consists of 216 colors (the remaining 40 colors out of the 256 colors are reserved for system usage, and are different on different types of computer systems such as Apple Mac, Microsoft Windows, etc.).
Below is the color safe palette.
(In each cell, I have given the RGB values in the range 0 to 255, as well the hexadecimal notation used in HTML coding).
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