Using and Converting to Color-Safe PalettesWhen you design web pages in HTML, as you probably know, you can use a tremendous range of colors (over 16 million) for fonts, tables, backgrounds and so forth using the COLOR attribute of the various HTML tags.
One thing that many novice webmasters don't think about is whether these colors will be displayed correctly on the screens of visitors who don't have the latest whiz-bang graphics cards.
There are still people out there who have graphics cards which are only capable of displaying 256 colors at once. In these cases, the only colors which you can be sure will be displayed correctly are those in the browser-safe color palette.
So what happens if your web page includes a color that isn't in the color-safe palette, and a person tries to view on a 256 color screen?
Answer: It depends on the user's web browser.
Review your HTML coding, and look at the colors in each COLOR= attribute... then change them to their closest color-safe equivalents.
(You might want to make a safe copy of your web pages before doing this, in case you make an oopsy).
Understanding The COLOR Attribute In HTML Code:
If you look at the COLOR= attributes in the HTML code, it usually looks something like this
(Sometimes you may also see named colors like "RED" or "MAGENTA" which is beyond the scope of this discussion, just skip over any of those).
The values in the quotes after the hash symbol, are actually three pairs of digits, representing the Red, Green, and Blue components of the color expressed as hexadecimal numbers in the range 00 to FF.
So for the color given above:
Converting to Color-Safe Colors:
Now we understand the theory, we're ready to convert a color to its closest color-safe equivalent.
For each of the Red, Green and Blue components, you need to convert them separately into values, you need to convert them separately into the color-safe equivalents, and then recombine the whole lot together.
The conversion step goes like this:
If we need to convert C20F8C to its closest color-safe equivalent:
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