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Funções da GD
PHP Manual

# imagelayereffect

(PHP 4 >= 4.3.0, PHP 5)

imagelayereffect — Set the alpha blending flag to use the bundled libgd layering effects

### Descrição

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

Set the alpha blending flag to use the bundled libgd layering effects.

### Parâmetros

`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.

### Valor Retornado

Retorna `TRUE` em caso de sucesso ou `FALSE` em falhas.

### Exemplos

Exemplo #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);
?>`

O exemplo acima irá imprimir algo similar a:

### Notas

> Nota: Esta função somente está disponível se o PHP estiver compilado com a versão embarcada da biblioteca GD.

> Nota: Esta função precisa do GD 2.0.1 ou posterior (2.0.28 ou posterior é recomendado).

imagejpeg
imageline
Funções da GD
PHP Manual