Imagick::setImageBackgroundColor()

(PECL imagick 2.0.0)

Sets the image background color

说明

Imagick::setImageBackgroundColor(mixed $background): bool

Sets the image background color.

参数

$background

返回值

成功时返回TRUE。

错误／异常

错误时抛出 ImagickException。

更新日志

<?php
 $im = new \Imagick();
    /* read image (914x784) */
  
   $im->readImage($_SERVER['DOCUMENT_ROOT']."/path/toimage/".$inputfront);
    
    $im->setImageBackgroundColor(new \ImagickPixel('transparent')); /* this is equal to -background none (in imagemagick command options ) */
 
    /*Control points for the distortion in order to check weather setImageBackgound is working properly*/
    $controlPoints = array( 0,0,
      280,0,
      994,0,
      914,50,
      994,862,
      784,842,
      0,862,
      110,762);
    /* Perform the distortion */
    $im->distortImage(\Imagick::DISTORTION_PERSPECTIVE, $controlPoints, true);
    /* Ouput the image */
    $output_front_distort="Projects/path/where you want to store image/distorted_book.png";
  
    header("Content-Type: image/png");
    $im->writeImage($_SERVER['DOCUMENT_ROOT']."/designerr/public/".$output_front_distort);
?>

Small example to optimize a gray scanned image:
<?php
  $im = new Imagick();
  $im->readImage("~/scaninput_300DPI.tiff");
 //deskew the image 
  $im->deskewImage(40); 
 //Crop to A4 and scanner pageoffset 50
  $im->cropImage(2480, 3416, 50, 0);
 //Need a Monochrome Image
  $im->setImageColorspace(2);
  $im->thresholdImage(11000);
 //Compressen tiff CCITT Group 4 
  $im->setImageCompression(Imagick::COMPRESSION_GROUP4);
  $im->writeimage("~/monochrome_300DPI.tiff");
 //Cleanup  
  $im->clear();
  $im->destroy();
?>