Imagick::getQuantumRange()

(PECL imagick 2.0.0)

Returns the Imagick quantum range

说明

Imagick::getQuantumRange(void): array

Returns the quantum range for the Imagick instance.

返回值

Returns an associative array containing the quantum range as an integer("quantumRangeLong")and as a string("quantumRangeString").

错误／异常

错误时抛出 ImagickException。

The getQuantumRange is a useful function, since many of the ImageMagick functions accept parameters from 0 to a maximum of the Quantum Range. When getting a return value for this, it doesn't return a string. It actually returns an array, with one type being a String ('quantumRangeLong') and the other type being a Long Int ('quantumRangeString'). Here's some sample code and the results, given a color, BMP file photograph that is 600x450 pixels...
<?php
      // Author: holdoffhunger@gmail.com
  
    // Imagick Type
    // ---------------------------------------------
  $imagick_type = new Imagick();
  
    // Open File
    // ---------------------------------------------
    
  $file_to_grab = "image_workshop_directory/test.bmp";
  
  $file_handle_for_viewing_image_file = fopen($file_to_grab, 'a+');
  
    // Grab File
    // ---------------------------------------------
  $imagick_type->readImageFile($file_handle_for_viewing_image_file);
  
    // Get Quantum Range
    // ---------------------------------------------
    
  $imagick_type_quantum_range = $imagick_type->getQuantumRange();
  
    // Print Results
    // ---------------------------------------------
  print("<pre>");
  print_r($imagick_type_quantum_range);
  print("</pre>");
?>
Output:
Array
(
  [quantumRangeLong] => 65535
  [quantumRangeString] => 65535
)