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A simple approach would be to calculate the number of increments (ea
number of colors).<br>
Then for each R,G,B component of the start and end color, calculate the
difference, and divide by number of increments.<br>
With this information you can construct each of the desired colors.<br>
Example:<br>
Start color: 200,100,50<br>
End color: 50, 200, 100<br>
Steps: 10<br>
Increments: (200-50)/10=-15, (100-200)/10=10,(50-100)/10=-5<br>
<br>
Color x: 200 + (-15 * x), 100 + (10 * x), 50 + (-5 * x)<br>
<br>
Rounding and other annoying stuff obviously plays in, and needs to be
handled.<br>
<br>
A more elegant approach would be to use the ColorBrewer system:<br>
<a class="moz-txt-link-freetext" href="http://www.personal.psu.edu/cab38/ColorBrewer/ColorBrewer_intro.html">http://www.personal.psu.edu/cab38/ColorBrewer/ColorBrewer_intro.html</a><br>
<br>
This system takes into account the type of data you are trying to
visualize.<br>
<br>
<pre class="moz-signature" cols="72">Regards, Kenneth Skovhede, GEOGRAF A/S
</pre>
<br>
<br>
Arnaud De Groof skrev:
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<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Hi,</span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">I use the theme layer
application (PHP) and I would like
apply a degraded color to the layer according the value. Currently,
when I use
this application the color is given randomly. Could you explain me the
process
to obtain a degraded color with this function?</span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Thanks,</span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Arnaud De Groof </span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"> </span></font></p>
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