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(PECL imagick 2.0.0)
Imagick::setImageMatte — Sets the image matte channel
$matte
)Sets the image matte channel. 此方法在Imagick基于ImageMagick 6.2.9以上版本编译时可用。
matte
True activates the matte channel and false disables it.
成功时返回 TRUE
。
[#1] martin at psinas dot com [2011-10-05 18:33:02]
I found this method is needed when creating a font / image mask, and needs to be set to false otherwise the mask won't take effect. Here is an example:
<?php
// Create objects
$image = new Imagick('myImage.png');
$watermark = new Imagick();
$mask = new Imagick();
$draw = new ImagickDraw();
// Define dimensions
$width = $image->getImageWidth();
$height = $image->getImageHeight();
// Create some palettes
$watermark->newImage($width, $height, new ImagickPixel('grey30'));
$mask->newImage($width, $height, new ImagickPixel('black'));
// Watermark text
$text = 'Copyright';
// Set font properties
$draw->setFont('Bookman-Demi');
$draw->setFontSize(20);
$draw->setFillColor('grey70');
// Position text
$draw->setGravity(Imagick::GRAVITY_SOUTHEAST);
// Draw text on the watermark palette
$watermark->annotateImage($draw, 10, 12, 0, $text);
// Draw text on the mask palette
$draw->setFillColor('white');
$mask->annotateImage($draw, 11, 13, 0, $text);
$mask->annotateImage($draw, 10, 12, 0, $text);
$draw->setFillColor('black');
$mask->annotateImage($draw, 9, 11, 0, $text);
// This is apparently needed for the mask to work
$mask->setImageMatte(false);
// Apply mask to watermark
$watermark->compositeImage($mask, Imagick::COMPOSITE_COPYOPACITY, 0, 0);
// Overlay watermark on image
$image->compositeImage($watermark, Imagick::COMPOSITE_DISSOLVE, 0, 0);
// Set output image format
$image->setImageFormat('png');
// Output the new image
header('Content-type: image/png');
echo $image;
?>