imagecolorexact help

[-entropyman]

Hello,

 

Anyone have any ideas as to what i'm doing wrong?  I always return "Color exists!" even when the color does not.

 

$src = 'http://205.234.203.76/pb000004.png';
$img = imagecreatefrompng($src);
$red = '255';
$green = '0';
$blue = '0';


$ind = imagecolorexact ( $img, $red, $green, $blue );
if ( $ind != -1 )
{
	echo " The color exists! ";
}else{
	echo "Fail";
}

echo "<img src= {$src}>";

?>

 

Any help appreciated!

[DarkWater]

First note on the manual page for imagecolorexact:

 

A few notes about this function...

 

This function will only work on images where the palette is 256 colors or less. You also can not use imagetruecolortopalette() to reduce the palette on a true color PNG image that has greater than 256 colors in it's palette, then call this function. If you try to do this imagecolorexact() will report colors not being in the image when they are in the image!

 

1. works on png(s) 8bit/256 colors or less.

2. works on all gif(s)

3. does not work on any type of jpg/jpeg image.

Credits:

jbr at ya-right dot com

18-Feb-2006 03:38

[-entropyman]

So are you saying it is impossible to do what I am trying to do?  And thank you for the quick reply 

[DarkWater]

You want to see if a specific color is in an image?  I'll check if there's a way other than looping through every pixel (slow).

[-entropyman]

That's exactly what I would like to do