imagelayereffect

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

imagelayereffect — Set the alpha blending flag to use layering effects

Description

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

Set the alpha blending flag to use layering effects.

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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.

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Return Values

Returns TRUE on success or FALSE on failure.

PHP: imagelayereffect - Manual Home of Manuel PHP Contents Haut

Changelog

Version	Description
7.2.0	Added `IMG_EFFECT_MULTIPLY` (requires system libgd >= 2.1.1 or the bundled libgd).

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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:

PHP: imagelayereffect - Manual Home of Manuel PHP Contents Haut

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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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-imagelayereffect.html

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References

Manuel PHP : http://php.net

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