Those that have Ubuntu servers note, that this function is added in PHP's GD library fork and is not available by default in Ubuntu php5-gd package.
Here's how-to install the PHP GD version: http://preview.tinyurl.com/yel4r7t
imagecolormatch
(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
imagecolormatch — Hacer que los colores de la versión de la paleta de una imagen coincidan más estrechamente con la versión de color verdadero
Descripción
Hace que los colores de la versión de la paleta de una imagen coincidan más estrechamente con la versión de color verdadero.
Parámetros
-
image1 -
Un recurso de enlace a una imagen de color verdadero.
-
image2 -
Un recurso de enlace a una imagen de paleta que apunta a una imagen que tiene el mismo tamaño que
image1.
Valores devueltos
Devuelve true en caso de éxito o false en caso de error.
Ejemplos
Ejemplo #1 Ejemplo de imagecolormatch()
<?php
// Establecer las imágenes de color verdadero y de paleta
$im1 = imagecreatefrompng('./gdlogo.png');
$im2 = imagecreate(imagesx($im1), imagesy($im1));
// Añadir algunos colores a $im2
$colores = Array();
$colores[] = imagecolorallocate($im2, 255, 36, 74);
$colores[] = imagecolorallocate($im2, 40, 0, 240);
$colores[] = imagecolorallocate($im2, 82, 100, 255);
$colores[] = imagecolorallocate($im2, 84, 63, 44);
// Hacer coincidir estos colores con la imagen de color verdadero
imagecolormatch($im1, $im2);
// Liberar memoria
imagedestroy($im1);
imagedestroy($im2);
?>
add a note
User Contributed Notes 3 notes
gk at karko dot net ¶
14 years ago
albriNOght at anSPAMre dot net ¶
18 years ago
This function appears to work by changing the values of the colors of the paletted image -- no good if you're trying to force the resultant image to stick with certain pre-defined color values.
Samantha ¶
20 years ago
This function is a godsend! It works exactly as documented.
I'm working on an application where I need to take a transparent GIF, matte the GIF on a user defined background color, and finally scale the GIF based on a user defined %.
The only way I could get this to work so that the final image was high quality, ie: no jagged edges, and a smooth scale, was to convert the GIF to a JPG, and then copy the JPG into a new GIF image like this:
// open transparent gif
$GIFimg = imagecreatefromgif($file_path);
// create jpg image
$JPGimg = imagecreatetruecolor($width, $height);
// copy GIF to JPG
imagecopy($JPGimg, $GIFimg, 0, 0, 0, 0, $width, $height);
// create a true color image
$JPGscaled = imagecreatetruecolor($n_width, $n_height);
// scale the new JPG using the truecolor image
imagecopyresampled($JPGscaled, $JPGimg, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
// create final GIF image
$GIFfinal = imagecreate($n_width, $n_height);
// copy the scaled JPG back to a GIF
imagecopymerge($GIFfinal, $JPGscaled, 0, 0, 0, 0, $n_width, $n_height, 100);
This worked great except the final step, copying the JPG to a GIF. If the JPG had too many colors, the function would index the colors to make it a palette image. So what would end up happening is the final image contained INCORRECT colors.
Adding this one line at the bottom of the code fixed everything.
imagecolormatch($JPGscaled, $GIFfinal);
I hope this helps anyone who is converting images back and forth and dealing with palette issues and color correction. Also, be aware that the above code is a sample and will not work by copying and pasting.
