Last updated: Fri, 10 Oct 2008

imagecolorstotal

(PHP 4, PHP 5)

imagecolorstotal — Find out the number of colors in an image's palette

Description

int imagecolorstotal ( resource $image )

Returns the number of colors in an image palette.

Parameters

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

Return Values

Returns the number of colors in the specified image's palette or 0 for truecolor images.

Examples

Example #1 Getting total number of colors in an image using imagecolorstotal()


<?php
// Create image instance
$im = imagecreatefromgif('php.gif');

echo 'Total colors in image: ' . imagecolorstotal($im);

// Free image
imagedestroy($im);
?>

The above example will output something similar to:

Colors: 128


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 04:34


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++; // F�r 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.

add a note

imagecolortransparent

imagecolorsforindex