imagecolorat
A way to get each time an answer :
<?php
function imagegetcolor($im, $r, $g, $b) {
$c=imagecolorexact($im, $r, $g, $b);
if ($c!=-1) return $c;
$c=imagecolorallocate($im, $r, $g, $b);
if ($c!=-1) return $c;
return imagecolorclosest($im, $r, $g, $b);
}
?>
If the *exact* color is found in the image, it will be returned. If we don't have the exact color, we try to allocate it. If we can't allocate it, we return the closest color in the image.
imagecolorclosest
(PHP 4, PHP 5)
imagecolorclosest — Obtiene el índice del color más cercano al color especificado
Descripción
int imagecolorclosest
( resource $im
, int $red
, int $green
, int $blue
)
Devuelve el índice del color de la paleta de la imagen que sea más "cercano" al valor RGB especificado.
La "distancia" entre el color deseado y cada color de la paleta es calculada como si los valores RGB representasen puntos en un espacio tridimensional.
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 imagecolorexact().
add a note
User Contributed Notesimagecolorclosest
MagicalTux at FF dot st
28-Jun-2005 03:22
28-Jun-2005 03:22
Vikrant Korde <vakorde at hotmail dot com>
11-Oct-2003 05:10
11-Oct-2003 05:10
This functuion is useful when you are dealing with previously present images like .png, .jpg, etc. You can use this function for writing a text on the image.
For me the function imagecolorallocate() was returning the -1 value. after lot of RnD and site search i found a function use of imagecolorclosest(). This solved my problem of writing the text on the image with customised color.
Actually previously it was writing on the image but the color was not distinct. It was using the same color as of that background image.
The following code segment was fine with me.
header ("Content-type: image/jpeg");
$im = imagecreatefromjpeg("BlankButton.jpg");
$white = imageColorClosest($im, 255,255,255);
// this is for TTF fonts
imagettftext ($im, 20, 0, 16, 30, $white, "/usr/X11R6/lib/X11/fonts/TTF/luximb.ttf", "Vikrant");
//this is for notmal font
imagestring($im, 4, 0,0,"Korde", $white);
imagejpeg($im,"",150);
imagedestroy ($im);