Imagick::setImageMatte()
(PECL imagick 2.0.0)
Sets the image matte channel
说明
Imagick::setImageMatte(bool $matte): bool
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。
参数
- $matte
True activates the matte channel and false disables it.
返回值
成功时返回TRUE
。
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; ?>