实例

Imagick makes image manipulation in PHP extremely easy through an OO interface. Here is a quick example on how to make a thumbnail:

例 #1 使用Imagick创建缩略图

<?php
 header('Content-type: image/jpeg');
 $image = new Imagick('image.jpg');
 // If 0 is provided as a width or height parameter,
 // aspect ratio is maintained
 $image->thumbnailImage(100, 0);
 echo $image;
?>

Using SPL and other OO features supported in Imagick, it can be simple to resize all files in a directory (useful for batch resizing large digital camera images to be web viewable). Here we use resize, as we might want to retain certain meta-data:

Example #2 Make a thumbnail of all JPG files in a directory

<?php
 $images = new Imagick(glob('images/*.JPG'));
 foreach($images as $image) {
   // Providing 0 forces thumbnailImage to maintain aspect ratio
   $image->thumbnailImage(1024,0);
 }
 $images->writeImages();
?>

This is an example of creating a reflection of an image. The reflection is created by flipping the image and overlaying a gradient on it. Then both, the original image and the reflection is overlayed on a canvas.

Example #3 Creating a reflection of an image

<?php
 /* Read the image */
 $im = new Imagick("test.png");
 /* Thumbnail the image */
 $im->thumbnailImage(200, null);
 /* Create a border for the image */
 $im->borderImage(new ImagickPixel("white"), 5, 5);
 /* Clone the image and flip it */
 $reflection = $im->clone();
 $reflection->flipImage();
 /* Create gradient. It will be overlayed on the reflection */
 $gradient = new Imagick();
 /* Gradient needs to be large enough for the image and the borders */
 $gradient->newPseudoImage($reflection->getImageWidth() + 10, $reflection->getImageHeight() + 10, "gradient:transparent-black");
 /* Composite the gradient on the reflection */
 $reflection->compositeImage($gradient, imagick::COMPOSITE_OVER, 0, 0);
 /* Add some opacity. Requires ImageMagick 6.2.9 or later */
 $reflection->setImageOpacity( 0.3 );
 /* Create an empty canvas */
 $canvas = new Imagick();
 /* Canvas needs to be large enough to hold the both images */
 $width = $im->getImageWidth() + 40;
 $height = ($im->getImageHeight() * 2) + 30;
 $canvas->newImage($width, $height, new ImagickPixel("black"));
 $canvas->setImageFormat("png");
 /* Composite the original image and the reflection on the canvas */
 $canvas->compositeImage($im, imagick::COMPOSITE_OVER, 20, 10);
 $canvas->compositeImage($reflection, imagick::COMPOSITE_OVER, 20, $im->getImageHeight() + 10);
 /* Output the image*/
 header("Content-Type: image/png");
 echo $canvas;
?>

The above example will output something similar to:

This example illustrates how to use fill patterns during drawing.

Example #4 Filling text with gradient

<?php
 /* Create a new imagick object */
 $im = new Imagick();
 /* Create new image. This will be used as fill pattern */
 $im->newPseudoImage(50, 50, "gradient:red-black");
 /* Create imagickdraw object */
 $draw = new ImagickDraw();
 /* Start a new pattern called "gradient" */
 $draw->pushPattern('gradient', 0, 0, 50, 50);
 /* Composite the gradient on the pattern */
 $draw->composite(Imagick::COMPOSITE_OVER, 0, 0, 50, 50, $im);
 /* Close the pattern */
 $draw->popPattern();
 /* Use the pattern called "gradient" as the fill */
 $draw->setFillPatternURL('#gradient');
 /* Set font size to 52 */
 $draw->setFontSize(52);
 /* Annotate some text */
 $draw->annotation(20, 50, "Hello World!");
 /* Create a new canvas object and a white image */
 $canvas = new Imagick();
 $canvas->newImage(350, 70, "white");
 /* Draw the ImagickDraw on to the canvas */
 $canvas->drawImage($draw);
 /* 1px black border around the image */
 $canvas->borderImage('black', 1, 1);
 /* Set the format to PNG */
 $canvas->setImageFormat('png');
 /* Output the image */
 header("Content-Type: image/png");
 echo $canvas;
?>

The above example will output something similar to:

Working with animated GIF images

Example #5 Read in GIF image and resize all frames

<?php
 /* Create a new imagick object and read in GIF */
 $im = new Imagick("example.gif");
 /* Resize all frames */
 foreach ($im as $frame) {
     /* 50x50 frames */
     $frame->thumbnailImage(50, 50);
     /* Set the virtual canvas to correct size */
     $frame->setImagePage(50, 50, 0, 0);
 }
 /* Notice writeImages instead of writeImage */
 $im->writeImages("example_small.gif", true);
?>

Working with ellipse primitive and custom fonts

Example #6 Create a PHP logo

<?php
 /* Set width and height in proportion of genuine PHP logo */
 $width = 400;
 $height = 210;
 /* Create an Imagick object with transparent canvas */
 $img = new Imagick();
 $img->newImage($width, $height, new ImagickPixel('transparent'));
 /* New ImagickDraw instance for ellipse draw */
 $draw = new ImagickDraw();
 /* Set purple fill color for ellipse */
 $draw->setFillColor('#777bb4');
 /* Set ellipse dimensions */
 $draw->ellipse($width / 2, $height / 2, $width / 2, $height / 2, 0, 360);
 /* Draw ellipse onto the canvas */
 $img->drawImage($draw);
 /* Reset fill color from purple to black for text (note: we are reusing ImagickDraw object) */
 $draw->setFillColor('black');
 /* Set stroke border to white color */
 $draw->setStrokeColor('white');
 /* Set stroke border thickness */
 $draw->setStrokeWidth(2);
 /* Set font kerning (negative value means that letters are closer to each other) */
 $draw->setTextKerning(-8);
 /* Set font and font size used in PHP logo */
 $draw->setFont('Handel Gothic.ttf');
 $draw->setFontSize(150);
 /* Center text horizontally and vertically */
 $draw->setGravity(Imagick::GRAVITY_CENTER);
 /* Add center "php" with Y offset of -10 to canvas (inside ellipse) */
 $img->annotateImage($draw, 0, -10, 0, 'php');
 $img->setImageFormat('png');
 /* Set appropriate header for PNG and output the image */
 header('Content-Type: image/png');
 echo $img;
?>

The above example will output something similar to: