imagelayereffect
(PHP 4 >= 4.3.0, PHP 5, PHP 7)
imagelayereffect — 锟借定 alpha 锟斤拷色锟斤拷志锟斤拷使锟矫绑定碉拷 libgd 锟街诧拷效锟斤拷
说锟斤拷
imagelayereffect
( resource
$image
, int $effect
) : bool锟借定 alpha 锟斤拷色锟斤拷志锟斤拷使锟矫绑定碉拷 libgd 锟街诧拷效锟斤拷锟斤拷
锟斤拷锟斤拷
-
image -
锟斤拷图锟襟创斤拷锟斤拷锟斤拷(锟斤拷锟斤拷imagecreatetruecolor())锟斤拷锟截碉拷图锟斤拷锟斤拷源锟斤拷
-
effect -
One of the following constants:
-
IMG_EFFECT_REPLACE -
Use pixel replacement (equivalent of passing
TRUEto imagealphablending()) -
IMG_EFFECT_ALPHABLEND -
Use normal pixel blending (equivalent of passing
FALSEto 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.
-
锟斤拷锟斤拷值
锟缴癸拷时锟斤拷锟斤拷 TRUE锟斤拷 锟斤拷锟斤拷锟斤拷失锟斤拷时锟斤拷锟斤拷 FALSE锟斤拷
锟斤拷锟斤拷
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);
?>
锟斤拷锟斤拷锟斤拷锟教碉拷锟斤拷锟斤拷锟斤拷锟斤拷冢锟�
注锟斤拷
Note: 锟剿猴拷锟斤拷锟斤拷锟斤拷锟斤拷 GD 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 PHP 锟芥本锟叫匡拷锟矫★拷
Note: 锟剿猴拷锟斤拷锟斤拷要 GD 2.0.1 锟斤拷锟斤拷甙姹�(锟狡硷拷 2.0.28 锟斤拷锟斤拷锟竭版本)锟斤拷