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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.

### 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