Image Processing (ImageMagick)

    Einführung

    Warnung

    Diese Erweiterung ist EXPERIMENTELL. Das Verhalten dieser Erweiterung, einschließlich der Funktionsnamen, und alles Andere, was hier dokumentiert ist, kann sich in zukünftigen PHP-Versionen ohne Ankündigung ändern. Seien Sie gewarnt und verwenden Sie diese Erweiterung auf eigenes Risiko.

    Imagick is a native php extension to create and modify images using the ImageMagick API.

    About ImageMagick

    ImageMagick is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (over 100) including DPX, EXR, GIF, JPEG, JPEG-2000, PDF, PhotoCD, PNG, Postscript, SVG, and TIFF.

    ImageMagick Studio LLC is a non-profit organization dedicated to making software imaging solutions freely available.

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    User Contributed Notes 3 notes

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    16
    mlong-php at mlong dot us
    18 years ago
    Here is an example on how to take an image that is already in a string (say, from a database), and resize it, add a border, and print it out. I use this for showing reseller logos

  // Decode image from base64
  $image=base64_decode($imagedata);

  // Create Imagick object
  $im = new Imagick();

  // Convert image into Imagick
  $im->readimageblob($image);

  // Create thumbnail max of 200x82
  $im->thumbnailImage(200,82,true);

  // Add a subtle border
  $color=new ImagickPixel();
  $color->setColor("rgb(220,220,220)");
  $im->borderImage($color,1,1);

  // Output the image
  $output = $im->getimageblob();
  $outputtype = $im->getFormat();

  header("Content-type: $outputtype");
  echo $output;
    up
    0
    Eero Niemi (eero at eero dot info)
    17 years ago
    To load image (usually vector image, like PDF) with larger resolution than image's default is, you have to set resolution before reading the file, like this:

<?php
$im = new Imagick(); 
$im->setResolution( 300, 300 ); 
$im->readImage( "test.pdf" );
?>
    up
    -1
    carlosvanhalen7 at gmail dot com
    12 years ago
    Here's a handy function that finds the first occurrence of a specific pixel. You can set the tolerance of the color you are looking for, or set it to 0 if want an exact match

<?php

function findPixel($img, $r, $g, $b, $tolerance=5)
{
    $original_                 = new Imagick($img);
    $height                    = 0;
    $width                    = 0;
    list($width, $height)    = getimagesize($img);
    $matrix_org                = array();
    $matrix_mrk                = array();

    for( $x = 0 ; $x < $width ; $x++){
        $matrix_org[$x]            = array();
        $matrix_mrk[$x]            = array();
    }

    for( $x = 0 ; $x < $width ; $x++ )
    {
        for( $y = 0 ; $y < $height ; $y++ ){
            $matrix_org[$x][$y]                = $original_->getImagePixelColor($x, $y)->getColorAsString();
            $colors                         = preg_replace('/[^-,0-9+$]/', '', $matrix_org[$x][$y]); 
            $colors                            = explode(',', $colors);
            $r_org                            = $colors[0];
            $g_org                            = $colors[1];
            $b_org                            = $colors[2];
            
            if(     ( $r <= ($r_org+$tolerance) && $r >= ($r_org - $tolerance) ) 
                &&  ( $g <= ($g_org+$tolerance) && $g >= ($g_org - $tolerance) ) 
                &&  ( $b <= ($b_org+$tolerance) && $b >= ($b_org - $tolerance) ) )
            {
                return array( $x, $y );
            }
        }
    }

    return false;
}

?>
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