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imagecolorexactalpha> <imagecolordeallocate
Last updated: Fri, 11 Apr 2008

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imagecolorexact

(PHP 4, PHP 5)

imagecolorexact — Devuelve el índice del color especificado

Descripción

int imagecolorexact ( resource $im , int $red , int $green , int $blue )

Devuelve el índice del color especificado de la paleta de la imagen.

Si el color no existe en la paleta de la imagen, se devuelve el valor -1.

Si se emplea una imagen creada a partir de un archivo, solamente se resuelven los colores usados en la imagen. Los colores que se encuentran exclusivamente en la paleta de la imagen no se resuelven.

Vea también imagecolorclosest().



add a note add a note User Contributed Notes
imagecolorexact
jbr at ya-right dot com
18-Feb-2006 09:38
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.
info at educar dot pro dot br
16-Nov-2005 08:14
<?php

$src
= "../images/pic.gif";

$red = 9;
$green = 9;
$blue = 4;

$pic0026 = imagecreatefromgif ( $src );

$ind = imagecolorexact ( $pic, $red, $green, $blue );

echo
'<img src="../images/pic.gif" border="0" alt="pic" title="View pic" /><br /><br />';

echo
"RED ( " . $red . " ) GREEN ( " . $green . " ) BLUE ( " . $blue . " )<br />-> Palette Index = " . $ind;

if (
$ind != -1 )
{
echo
"<br />[ The color exists! ]";
}
else
{
echo
"<br />[ The color does not exist! ]";
}

imagedestroy ( $pic );

?>

imagecolorexactalpha> <imagecolordeallocate
Last updated: Fri, 11 Apr 2008
 
 
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