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imagelayereffect

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

imagelayereffectSet the alpha blending flag to use layering effects

Descrierea

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

Set the alpha blending flag to use layering effects.

Parametri

image

O resursă - imagine, întoarsă de una din funcțiile de creare a imaginilor, cum ar fi imagecreatetruecolor().

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.
IMG_EFFECT_MULTIPLY
Overlays with a multiply effect.

Valorile întoarse

Întoarce valoarea TRUE în cazul succesului sau FALSE în cazul eșecului.

Istoricul schimbărilor

Versiune Descriere
7.2.0 Added IMG_EFFECT_MULTIPLY (requires system libgd >= 2.1.1 or the bundled libgd).

Exemple

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);
?>

Exemplul de mai sus va afișa ceva similar cu:

Output of example : imagelayereffect()

Note

Before PHP 5.5.0, this function is only available if PHP is compiled with the bundled version of the GD library.

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