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(PECL imagick 2.0.0)
Imagick::posterizeImage — Reduces the image to a limited number of color level
$levels
, bool $dither
)Reduces the image to a limited number of color level.
levels
dither
成功时返回 TRUE
。
Example #1 Imagick::posterizeImage()
<?php
function posterizeImage ( $imagePath , $posterizeType , $numberLevels ) {
$imagick = new \ Imagick ( realpath ( $imagePath ));
$imagick -> posterizeImage ( $numberLevels , $posterizeType );
$imagick -> setImageFormat ( 'png' );
header ( "Content-Type: image/png" );
echo $imagick -> getImageBlob ();
}
posterizeImage ( $imagePath , \ Imagick :: DITHERMETHOD_RIEMERSMA , 8 );
?>