[thelist] web-safe pallette
Linda R.
lightly at sc.rr.com
Fri Jan 7 07:31:27 CST 2005
Ian Feavearyear wrote:
> Does anyone worry about sticking to the web-safe pallette these days?
> Just curious!
Naw. Use the colors you like but test a lot.
By the way, Web safe doesn't mean that anyone using any browser on any
Operating System will see those colors in the same way. It means they
won't see them as dithered.
The Web safe palette was developed for 256 color video display. 8-bit
and 16-bit color systems share only 8 colors of the Web 216 palette.
That means the Web 216 color palette is pretty much guaranteed to dither
or shift on a 16-bit color display.
16 bit, or "High color" was originally developed for artists who work in
CMYK color space. 16 bits can be evenly divided into 4 bits per
channel—4 Cyan, 4 Magenta, 4 Yellow, and 4 Key (blacK). RGB is a three
value color space. 16 bits can’t be evenly divided by 3, so you end up
with an extra color bit. That’s where things go wonky.
Different display card manufacturers have different ways of dealing with
that 16th bit. One may assign the orphaned bit to the blue channel,
making a color look cooler. Another manufacturer may assign bit #16 to
the red channel, making the same color look warmer. A third display card
manufacturer might choose to ignore bit 16 altogether. This color shift
between systems is why the background color of a GIF matches the
background color of an HTML page on my system but doesn’t match it on
yours. It's worth noting that LCD screens are less color faithful than
CRT monitors, especially when viewing the screen a bit off the
perpendicular. 16-bit color display is a complete madhouse!
--
Cheers,
Linda Rathgeber
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