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    <p>This is a rough idea only - you will need to tweak it to your own needs.</p> <p>Basically, I thought that, as colors are recorded as RGB, either as a Hex string "#000000" to "#ffffff", or as an RGB set "rgb(0,0,0)" to "rgb(255,255,255)", and these are interchangeable/translateable, this is a simple mathematical rounding issue.</p> <p>In the full range of colors there would be (16*16)*(16*16)*(16*16) = 256*256*256 = 16,777,216 possible colors.</p> <p>Rounding colors to their closest single character Hex value reduces that to 16*16*16 = 4,096 possible colors. Still far too many, but getting closer.</p> <p>Rounding colors to a single character value, but then limiting that further to being one of 4 (0,3,7,f) reduces it to 4*4*4 = 32. Close enough for me.</p> <p>So, I built a very basic PHP function to try and achieve this:</p> <pre><code>function coloround( $incolor ){ $inR = hexdec( $incolor{0}.$incolor{1} )+1; $inG = hexdec( $incolor{2}.$incolor{3} )+1; $inB = hexdec( $incolor{4}.$incolor{5} )+1; # Round from 256 values to 16 $outR = round( $outR/16 ); $outG = round( $outG/16 ); $outB = round( $outB/16 ); # Round from 16 to 4 $outR = round( $outR/4 ); $outG = round( $outG/4 ); $outB = round( $outB/4 ); # Translate to Hex $outR = dechex( max( 0 , $outR*4-1 ) ); $outG = dechex( max( 0 , $outG*4-1 ) ); $outB = dechex( max( 0 , $outB*4-1 ) ); # Output echo sprintf( '&lt;span style="background-color:#%s;padding:0 10px;"&gt;&lt;/span&gt; &amp;gt; &lt;span style="background-color:#%s;padding:0 10px;"&gt;&lt;/span&gt;%s has been rounded to %s&lt;br&gt;' , $incolor , $outR.$outG.$outB , $incolor , $outR.$outG.$outB ); } </code></pre> <p>This function, when passed a hex string, echos a sample of the original color and a sample of the abbreviated color.</p> <p>This is just a basic proof-of-concept, as I do not know the format Imagemagick is returning the colors as, but you may be able to utilise this logic to create your own.</p> <p>From those 32 colors then, you could group the similar (there would probably be about 8 shades of grey in there) and name the remainder to allow your users to search by them.</p>
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