Imagick::posterizeImage()
(PECL imagick 2.0.0)
Reduces the image to a limited number of color level
说明
Imagick::posterizeImage(int $levels,bool $dither): bool
Reduces the image to a limited number of color level.
参数
- $levels
- $dither
返回值
成功时返回TRUE
。
范例
Example #1 Imagick::posterizeImage()
<?php function posterizeImage($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); ?>
At PHP 7.x before $im->posterizeimage(2, FALSE); do $im->setImageType(imagick::IMGTYPE_COLORSEPARATION); on PHP 5.x working without setImageType well. Example: $im = new Imagick(); $r = $im->readImageBlob($label); if (!$r) { return FALSE; } $im->setImageType(imagick::IMGTYPE_COLORSEPARATION); $im->posterizeimage(2, 0); $bmp = $im->getImageBlob();