Imagick::getQuantumRange

(PECL imagick 2.0.0)

Imagick::getQuantumRange — Returns the Imagick quantum range

说明

array Imagick::getQuantumRange ( void )

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。

User Contributed Notes

holdoffhunger at gmail dot com 03-May-2012 06:42
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
)