Voting

The Note You're Voting On

13 years ago
This script will print a watermark on the middle of an image. The width of the watermark will depend on the width of the image.

<?php
// Create a new Imagick object
$objImage = new Imagick( 'path/to/image.jpg' );

// Get the width and height of the image
$imgSize   = $objImage->getImageGeometry();
$imgWidth  = $imgSize['width'];
$imgHeight = $imgSize['height'];

// Create a new text object
$objText = new ImagickDraw();

// Set te text color
$objText->setFillColor( new ImagickPixel('grey') );

// Set the text transparency: 0 = transparent, 1 = opaque
$objText->setFillAlpha( 0.2 );

// Top left will be point of reference
$objText->setGravity( Imagick::GRAVITY_NORTHWEST );

// Create an array for the textwidth and textheight
$textProperties = array( 'textWidth' => 0 );

// Set the desired width of the watermark to 90% of the image width
$textDesiredWidth = intval( $imgWidth * 0.9 );

// Set an initial value for the fontsize, will be increased in the loop below
$fontSize = 0;

// We use the domain name of the server for the watermark text
$text = $_SERVER['SERVER_NAME'];

// Increase the fontsize until we have reached our desired width
while ( $textProperties['textWidth'] <= $textDesiredWidth ) {
    $objText->setFontSize( $fontSize );
    $textProperties = $objImage->queryFontMetrics( $objText, $text );
    $fontSize++;
}

// Calculate the horizontal starting position
$watermarkPosX = intval( ($imgWidth - $textProperties['textWidth']) / 2 );

// Calculate the vertical starting position
$watermarkPosY = floor( ($imgHeight - $textProperties['textHeight']) / 2 );

// Composite the text on the image
$objImage->annotateImage( $objText, $watermarkPosX, $watermarkPosY, 0, $text );

// The browser must know this is JPEG image or else it will display garbled text
header( 'Content-Type: image/jpeg' );

// Display the image
echo $objImage;
?>
<< Back to user notes page