logo.html
9cdb4be011592be85c6e6ea28ed982a6dfd2e8f4777598b18bdf4fc25f01d0dc<HTML>
<HEAD> <TITLE>The SNOW Logo</TITLE> </HEAD>
<BODY BGCOLOR="#d8d8d8" TEXT="#000080" LINK="#0000FF">
<H1> The SNOW Logo </H1>
<P>
The logo below looks pretty blank, doesn't it? Just the word SNOW on
a white background? </P>
<CENTER><IMG SRC="snow-logo.gif"></CENTER>
<P>
But there is actually a picture of a polar bear hidden in there.
A polar bear in a snowstorm, to be precise. </P>
<P>
To the human eye, there is no discernable difference between the
pixel values 254 and 255, especially when displayed on a computer
monitor. Actually, with the colourmap conservation schemes employed
by most browsers, they are probably displayed as truly identical
pixels anyway. </P>
<P>
However, the difference is there in the image file, even if it is
not visible. This allows information to be hidden in an image,
a fact that has been exploited by a number of steganography programs.
In this case, there is a polar bear drawn in colours one-less-than-white. </P>
<P>
To see the bear, we simply tweak the colourmap. </P>
<CENTER><IMG SRC="pbear.gif"></CENTER>
</BODY>
</HTML>
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