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imagelayereffect

Description

The imagelayereffect of Image for PHP sets the alpha blending flag to use layering effects.

Syntax

imagelayereffect(
    GdImage $image,
    int $effect
): bool

Parameters

image

A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor().

effect

One of the following constants:

ConstantDescription
IMG_EFFECT_REPLACEUse pixel replacement.
IMG_EFFECT_ALPHABLENDUse normal pixel blending.
IMG_EFFECT_NORMALSame as IMG_EFFECT_ALPHABLEND.
IMG_EFFECT_OVERLAYOverlay has the effect that black background pixels will remain black, white background pixels will remain white, but gray background pixels will take the color of the foreground pixel.
IMG_EFFECT_MULTIPLYOverlays with a multiply effect.

Return

Returns true on success or false on failure.

Examples

1 · return

<?

$width = 100;
$height = 100;
$image = imagecreate($width, $height);

$effect = IMG_EFFECT_NORMAL;

$return = imagelayereffect($image, $effect);

var_export($return);

true

2 · base64 · effect · IMG_EFFECT_REPLACE

<?

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

$effect = IMG_EFFECT_REPLACE;
imagelayereffect($image, $effect);

$red = 128;
$green = 128;
$blue = 128;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x = 0;
$y = 0;
imagefill($image, $x, $y, $color);

$red = 255;
$green = 0;
$blue = 0;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 0;
$y1 = 0;
$x2 = 50;
$y2 = 50;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

$red = 0;
$green = 255;
$blue = 0;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 25;
$y1 = 25;
$x2 = 75;
$y2 = 75;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

$red = 0;
$green = 0;
$blue = 255;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 50;
$y1 = 50;
$x2 = 100;
$y2 = 100;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

ob_start();

    imagepng($image);

$output = ob_get_clean();

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

<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAIAAAD/gAIDAAAACXBIWXMAAA7EAAAOxAGVKw4bAAABEUlEQVR4nO3bMQrDMBAAQTv44fLL4z7dwIEV2HnAIRapOnR+j03da719hF+ftw/wT4oFigWKBYoFigWKBYoFigWKBYoFigWKBYoFigWKBYoFigWKBYoFigWKBYoFigXOwSXr5KxR614jc7pZoFigWKBYoFigWKBYoFigWKBYoFigWKBYoFigWKBYoFigWKBYoFigWKBYoFigWGDXJeuWC9tr9Hft4Kgd9QxBsUCxQLFAsUCxQLFAsUCxQLFAsUCxQLFAsUCxQLFAsUCxQLFAsUCxQLFAsUCxwDU4a+p37bHrtrabBYoFigWKBYoFigWKBYoFigWKBYoFigWKBYoFigWKBYoFigWKBYoFigWKBYoFHg2HDcsLZlWkAAAAAElFTkSuQmCC">
</body>
</html>

3 · base64 · effect · IMG_EFFECT_ALPHABLEND

<?

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

$effect = IMG_EFFECT_ALPHABLEND;
imagelayereffect($image, $effect);

$red = 128;
$green = 128;
$blue = 128;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x = 0;
$y = 0;
imagefill($image, $x, $y, $color);

$red = 255;
$green = 0;
$blue = 0;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 0;
$y1 = 0;
$x2 = 50;
$y2 = 50;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

$red = 0;
$green = 255;
$blue = 0;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 25;
$y1 = 25;
$x2 = 75;
$y2 = 75;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

$red = 0;
$green = 0;
$blue = 255;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 50;
$y1 = 50;
$x2 = 100;
$y2 = 100;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

ob_start();

    imagepng($image);

$output = ob_get_clean();

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

<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,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">
</body>
</html>

4 · base64 · effect · IMG_EFFECT_NORMAL

<?

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

$effect = IMG_EFFECT_NORMAL;
imagelayereffect($image, $effect);

$red = 128;
$green = 128;
$blue = 128;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x = 0;
$y = 0;
imagefill($image, $x, $y, $color);

$red = 255;
$green = 0;
$blue = 0;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 0;
$y1 = 0;
$x2 = 50;
$y2 = 50;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

$red = 0;
$green = 255;
$blue = 0;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 25;
$y1 = 25;
$x2 = 75;
$y2 = 75;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

$red = 0;
$green = 0;
$blue = 255;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 50;
$y1 = 50;
$x2 = 100;
$y2 = 100;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

ob_start();

    imagepng($image);

$output = ob_get_clean();

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

<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,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">
</body>
</html>

5 · base64 · effect · IMG_EFFECT_OVERLAY

<?

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

$effect = IMG_EFFECT_OVERLAY;
imagelayereffect($image, $effect);

$red = 128;
$green = 128;
$blue = 128;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x = 0;
$y = 0;
imagefill($image, $x, $y, $color);

$red = 255;
$green = 0;
$blue = 0;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 0;
$y1 = 0;
$x2 = 50;
$y2 = 50;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

$red = 0;
$green = 255;
$blue = 0;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 25;
$y1 = 25;
$x2 = 75;
$y2 = 75;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

$red = 0;
$green = 0;
$blue = 255;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 50;
$y1 = 50;
$x2 = 100;
$y2 = 100;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

ob_start();

    imagepng($image);

$output = ob_get_clean();

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

<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,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">
</body>
</html>

6 · base64 · effect · IMG_EFFECT_MULTIPLY

<?

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

$effect = IMG_EFFECT_MULTIPLY;
imagelayereffect($image, $effect);

$red = 128;
$green = 128;
$blue = 128;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x = 0;
$y = 0;
imagefill($image, $x, $y, $color);

$red = 255;
$green = 0;
$blue = 0;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 0;
$y1 = 0;
$x2 = 50;
$y2 = 50;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

$red = 0;
$green = 255;
$blue = 0;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 25;
$y1 = 25;
$x2 = 75;
$y2 = 75;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

$red = 0;
$green = 0;
$blue = 255;
$alpha = 64;
$color = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);

$x1 = 50;
$y1 = 50;
$x2 = 100;
$y2 = 100;
imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);

ob_start();

    imagepng($image);

$output = ob_get_clean();

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

<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,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">
</body>
</html>