January 22, 2000 - Color Depth
January 22, 2000|
Tips: January 2000
Yehuda Shiran, Ph.D.
Color Bit Depth Number of Colors 4 16 8 256 16 65,536 (High Color) 24 16,777,216 (True Color)
colorDepth property of the
screen object reveals the user's color bit depth. This property is very helpful if you're interested in providing the most suitable image for the user's color resolution. For example, you can create two versions of an image -- one with an 8-bit palette (
8bit.gif), and the other one with a 16-bit palette (
16bit.gif). A simple script offers a dynamic image based on a user's capability to display it:
</NOSCRIPT> definition which specifies a default image for browsers that cannot execute the script. The conditional statement in the script checks if the browser supports the screen object. If it doesn't, it prints the code for the default image. Navigator 2.0x doesn't support the
</NOSCRIPT> definition. In other words, it doesn't ignore its content. We set the
LANGUAGE attribute of the
<SCRIPT> tag to
document.write() method doesn't function properly within table cells.
Read more about the screen object in Column 17, Screen Properties.