imagelayereffect
imagelayereffect
(PHP 4 >= 4.3.0, PHP 5, PHP 7)
imagelayereffect — Set the alpha blending flag to use layering effects
Description
bool imagelayereffect ( resource $image , int $effect )
Set the alpha blending flag to use layering effects.
Parameters
-
image
-
An image resource, returned by one of the image creation functions, such as 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.
-
Return Values
Returns TRUE
on success or FALSE
on failure.
Changelog
Version | Description |
---|---|
7.2.0 | Added IMG_EFFECT_MULTIPLY (requires system libgd >= 2.1.1 or the bundled libgd). |
Examples
Example #1 imagelayereffect() 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($im); imagedestroy($im); ?>
The above example will output something similar to:
![Output of example : imagelayereffect()](https://secure.php.net/manual/en/images/21009b70229598c6a80eef8b45bf282b-imagelayereffect.png)
Notes
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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Licensed under the Creative Commons Attribution License v3.0 or later.
https://secure.php.net/manual/en/function.imagelayereffect.php