imagecolorstotal

(PHP 4, PHP 5)

imagecolorstotalFind 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 imagecreatefromgif().

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:

Total colors in image: 128

See Also

Коментарии

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)
$f fread($fpfilesize($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)
{
$c substr($c26);
$c substr($c0strpos($c"fe0102")); // Termination for the color table of non-transparent images
}
else
{
$c substr($c26);
$c substr($c0strpos($c"21f904")); // Termination for the color table
}

echo 
"<table border='0'>";

$i 0;
$y 0;
$str "";
$pix chunk_split($c6";"); // 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.
2003-11-01 09:34:23
http://php5.kiev.ua/manual/ru/function.imagecolorstotal.html
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>';
?>
2007-04-27 11:07:51
http://php5.kiev.ua/manual/ru/function.imagecolorstotal.html

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