GD and Image 函数
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imagecolorstotal

(PHP 4, PHP 5)

imagecolorstotal — 取得一幅图像的调色板中颜色的数目

说明

int imagecolorstotal ( resource $image )

本函数返回指定图像的调色板中的颜色数目。

参见 imagecolorat() 和 imagecolorsforindex()。

GD and Image 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: 取得一幅图像的调色板中颜色的数目

用户评论:

bisqwit at iki dot fi (27-Apr-2007 04:07)

This code shows the palettes for all .gif files in the current working directory. (Output is HTML.)
<?php
print '<pre>';
foreach(glob('*.gif') as $src_fn) 
{
  $im2 = ImageCreateFromGif($src_fn);
 
  echo '<a href="',htmlspecialchars($src_fn),'">';
  print sprintf('%-30s', $src_fn);
  echo '</a>';

  $cc = ImageColorsTotal($im2);
  for($n=0; $n<$cc; ++$n)
  {
    $c = ImageColorsForIndex($im2, $n);
    print
      sprintf('<span style="background:#%02X%02X%02X">&nbsp;</span>',
       $c['red'], $c['green'], $c['blue']);
  }
  ImageDestroy($im2);
  print "\n";
}
print '</pre>';
?>

black-eye at web dot de (01-Nov-2003 03:34)

I created a function to count the colors in a .gif file automatically. Works perfect on Win2k Servers

<?PHP
function bildinfo($bild)
{
/*
******* FUNCTION BILDINFO() ******* ******* ******* *******
******* ******* ******* ******* ******* ******* ******* *******
******* Copyright 2003 by www.BLACKEYE.org ******* *******
******* ******* ******* ******* ******* ******* ******* *******
Please don't change the copyright in this file. You can modify
this file, but NEVER remove the copyright !
If YOU were the creator of this function, you would say the
same, eh ? :)

For more informations / How to use:
HOMEPAGE: www.blackeye.org
******* ******* ******* ******* ******* ******* ******* *******
*/
$fp = fopen($bild, "rb"); // Open image in binary mode (for windows)
$f = fread($fp, filesize($bild));
$c = bin2hex($f); // Binary file -> Hex
$c = ereg_replace("5c30", "0000", $c); // In gif-files "5c30" stands for real "00" values. why ? i dont know
$b = $c;

$pos = strpos($c, "fe0102"); // 6 Byte termination for the color table
if ($pos > 0)
{
$c = substr($c, 26);
$c = substr($c, 0, strpos($c, "fe0102")); // Termination for the color table of non-transparent images
}
else
{
$c = substr($c, 26);
$c = substr($c, 0, strpos($c, "21f904")); // Termination for the color table
}

echo "<table border='0'>";

$i = 0;
$y = 0;
$str = "";
$pix = chunk_split($c, 6, ";"); // 6 Char long block (color)
$pix = explode(";",$pix);
sort($pix);
foreach($pix as $col)
{
if ($col && !ereg($col.";", $str) && strlen($col) == 6) // So that no color is twice in the list
{
$str .= $col.";";
$i++; // Fr die Table anzeige
$y++; // Anzahl Farben
if ($i == 1) { echo ""; }
echo "<td width='6' height='8' bgcolor='#$col' style='border:1px solid #000000;font-size:1px;' title='2003 by www.BLACKEYE.org'>";
echo " ";
echo "</td>";
if ($i == 10)
{
echo ""; $i = 0;
}
}
}

echo "</table>";
echo $y." visible colors";
}

$bild = ""; // Imagefile
bildinfo($bild);
?>
Only copy & paste this text into your .php file, where you want to show the image.