IMG_EFFECT_OVERLAY doesn't work in PHP 5.6.0 with GD version: 2.1.0-alpha.
(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
imagelayereffect — Define a opção de mesclagem alfa para usar efeitos de camada
Define a opção de mesclagem alfa para usar efeitos de camada.
image
Um objeto GdImage, retornado por uma das funções de criação de imagem, como imagecreatetruecolor().
effect
Uma das constantes a seguir:
IMG_EFFECT_REPLACE
true
para
imagealphablending())
IMG_EFFECT_ALPHABLEND
false
para
imagealphablending())
IMG_EFFECT_NORMAL
IMG_EFFECT_ALPHABLEND
.
IMG_EFFECT_OVERLAY
IMG_EFFECT_MULTIPLY
Versão | Descrição |
---|---|
8.0.0 |
O parâmetro image agora espera uma instância de GdImage;
anteriormente, um resource gd válido era esperado.
|
7.2.0 |
Adicionada a constante IMG_EFFECT_MULTIPLY (requer libgd de sistema >=
2.1.1 ou a libgd incluída no pacote).
|
Exemplo #1 Exemplo de imagelayereffect()
<?php
// Configura uma imagem
$im = imagecreatetruecolor(100, 100);
// Define a cor de fundo
imagefilledrectangle($im, 0, 0, 100, 100, imagecolorallocate($im, 220, 220, 220));
// Applica a opção de mesclagem alfa de sobreposição
imagelayereffect($im, IMG_EFFECT_OVERLAY);
// Desenha duas elipses cinzas
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));
// Mostra
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>
O exemplo acima produzirá algo semelhante a:
I have been getting a fatal error:
Fatal error: Call to undefined function imagelayereffect()
This doesn't work with Ubuntu server (8.04 lts) and the php5-gd package. If you need this you will have to recompile PHP with GD built-in.
^^ my name is coreyward ^^
imagelayereffect needs to be applied to the destination image, not the source image. As noted, the only useful "effect" as of this time is IMG_EFFECT_OVERLAY since the others are merely another way of setting the alpha blending flag.
You can also use imagecopymerge with a lower pct argument to blend two images with more control over the opacity at which the top image is blended.
<?
// overlays $im_src onto $im_dst properly (assuming same dims)
imagelayereffect($im_dst, IMG_EFFECT_OVERLAY);
imagecopy($im_dst, $im_src, 0, 0, 0, 0, $im_dst_x, $im_dst_y);
?>
I found the following example on a Chinese site and translated and adjusted it. It creates a portrait from the sample picture.
<?php
// Portrait image
$im = imagecreatefromjpeg( "sample.jpg");
// Get width and height
$w = imagesx($im);
$h = imagesy($im);
// Non-through
$c_visible = 0x007F7F7F;
// Background (black)
$c_bg = 0x00000000;
// Create mask
$im_mask = imagecreatetruecolor($w,$h);
imageFilledRectangle($im_mask, 0,0, $w,$h, $c_bg);
imageFilledEllipse ($im_mask, $w/2,$h/2, $w*.9,$h*.9, $c_visible);
// Only overlay seems to something useful
imagelayereffect($im_mask, IMG_EFFECT_OVERLAY);
imagecopy($im_mask, $im, 0,0, 0,0, $w,$h);
imagedestroy($im);
imagepng($im_mask);
imagedestroy($im_mask);
?>
Try removing the 'create mask' code and just add another image with 'createimagefromjpeg' to see 'normal' overlay. It blends the colors like different layers in Photoshop.