imagelayereffect

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

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

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image

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effect

One of the following constants:

IMG_EFFECT_REPLACE
Use pixel replacement (equivalent of passing TRUE to imagealphablending())
IMG_EFFECT_ALPHABLEND
Use normal pixel blending (equivalent of passing FALSE to imagealphablending())
IMG_EFFECT_NORMAL
Same as IMG_EFFECT_ALPHABLEND.
IMG_EFFECT_OVERLAY
Overlay has the effect that black background pixels will remain black, white background pixels will remain white, but grey background pixels will take the colour of the foreground pixel.

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Example #1 imagelayereffect() example

<?php
// Setup an image
$im imagecreatetruecolor(100100);

// Set a background
imagefilledrectangle($im00100100imagecolorallocate($im220220220));

// Apply the overlay alpha blending flag
imagelayereffect($imIMG_EFFECT_OVERLAY);

// Draw two grey ellipses
imagefilledellipse($im50504040imagecolorallocate($im100255100));
imagefilledellipse($im50505080imagecolorallocate($im100100255));
imagefilledellipse($im50508050imagecolorallocate($im255100100));

// Output
header('Content-type: image/png');

imagepng($im);
imagedestroy($im);
?>

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Output of example : imagelayereffect()

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