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imagelayereffect

imagelayereffect

Set the alpha blending flag to use layering effects

true **imagelayereffect** GdImage $image int $effect

Set the alpha blending flag to use layering effects.

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_OVERLAYOverlay 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.

IMG_EFFECT_MULTIPLYOverlays with a multiply effect.

return.true.always

Voorbeeld: example

<?php
// Setup an image
$im = imagecreatetruecolor(100, 100);

// Set a background
imagefilledrectangle($im, 0, 0, 100, 100, imagecolorallocate($im, 220, 220, 220));

// Apply the overlay alpha blending flag
imagelayereffect($im, IMG_EFFECT_OVERLAY);

// Draw two grey ellipses
imagefilledellipse($im, 50, 50, 40, 40, imagecolorallocate($im, 100, 255, 100));
imagefilledellipse($im, 50, 50, 50, 80, imagecolorallocate($im, 100, 100, 255));
imagefilledellipse($im, 50, 50, 80, 50, imagecolorallocate($im, 255, 100, 100));

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

imagepng($im);
?>
Vorige ← imagejpeg Volgende imageline →

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