imagecolormatch

Description
Syntax
Examples
Links

Description

The imagecolormatch of Image for PHP makes the colors of the palette version of an image more closely match the true color version.

Syntax

imagecolormatch(
    GdImage $image1,
    GdImage $image2
): bool

Parameters

image1

A truecolor image object.

image2

A palette image object pointing to an image that has the same size as image1.

Return

Returns true on success or false on failure.

Examples

1 · return

<?

$width = 100;
$height = 100;
$image1 = imagecreatetruecolor($width, $height);

$image2 = imagecreate($width, $height);

$red = 255;
$green = 255;
$blue = 255;
imagecolorallocate($image2, $red, $green, $blue);

$return = imagecolormatch($image1, $image2);

var_export($return);

true

2 · base64

<?

$width = 100;
$height = 100;
$image1 = imagecreatetruecolor($width, $height);

ob_start();

    imagepng($image1);

$output1 = ob_get_clean();

$image2 = imagecreate($width, $height);

$red = 255;
$green = 255;
$blue = 255;
imagecolorallocate($image2, $red, $green, $blue);

ob_start();

    imagepng($image2);

$output2 = ob_get_clean();

imagecolormatch($image1, $image2);

ob_start();

    imagepng($image2);

$output3 = ob_get_clean();

echo '<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,' . base64_encode($output1) . '"><br>
    <img src="data:image/png;base64,' . base64_encode($output2) . '"><br>
    <img src="data:image/png;base64,' . base64_encode($output3) . '">
</body>
</html>';

<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAIAAAD/gAIDAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAANElEQVR4nO3BAQ0AAADCoPdPbQ43oAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAfgx1lAABqFDyOQAAAABJRU5ErkJggg=="><br>
    <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkAQMAAABKLAcXAAAAA1BMVEX///+nxBvIAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAFElEQVQ4jWNgGAWjYBSMglFATwAABXgAAfmlXscAAAAASUVORK5CYII="><br>
    <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkAQMAAABKLAcXAAAAA1BMVEUAAACnej3aAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAFElEQVQ4jWNgGAWjYBSMglFATwAABXgAAfmlXscAAAAASUVORK5CYII=">
</body>
</html>