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at October 25, 2011 05:58 by uberdragon
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<?php
function colorPalette($imageFile, $numColors, $granularity = 5)
{
$granularity = max(1, abs((int)$granularity));
$colors = array();
$size = @getimagesize($imageFile);
if($size === false)
{
user_error("Unable to get image size data");
return false;
}
$img = @imagecreatefromjpeg($imageFile);
if(!$img)
{
user_error("Unable to open image file");
return false;
}
for($x = 0; $x < $size[0]; $x += $granularity)
{
for($y = 0; $y < $size[1]; $y += $granularity)
{
$thisColor = imagecolorat($img, $x, $y);
$rgb = imagecolorsforindex($img, $thisColor);
$red = round(round(($rgb['red'] / 0x33)) * 0x33);
$green = round(round(($rgb['green'] / 0x33)) * 0x33);
$blue = round(round(($rgb['blue'] / 0x33)) * 0x33);
$thisRGB = sprintf('%02X%02X%02X', $red, $green, $blue);
if(array_key_exists($thisRGB, $colors))
{
$colors[$thisRGB]++;
}
else
{
$colors[$thisRGB] = 1;
}
}
}
arsort($colors);
return array_slice(array_keys($colors), 0, $numColors);
}
// sample usage:
$palette = colorPalette('rmnp8.jpg', 10, 4);
echo "<table>\n";
foreach($palette as $color)
{
echo "<tr><td style='background-color:#$color;width:2em;'> </td><td>#$color</td></tr>\n";
}
echo "</table>\n";
?>
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This gives you an array whose values are higher for how often that color has been used.
Initial Title
colorPalette Function returns all colors in an image
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PHP