Imagick::getQuantumDepth()

(PECL imagick 2.0.0)

Gets the quantum depth

说明

Imagick::getQuantumDepth(void): array

Returns the Imagick quantum depth as a string.

返回值

Returns the Imagick quantum depth as a string.

错误／异常

错误时抛出 ImagickException。

The getQuantumDepth works much like the other "Depth" functions and much like the getQuantumRange function. Like the Depth functions, it returns a value indicating the number of bits to store the unique color values -- 16-bit = 2^16 unique colors, which is 65,535 (counting starts at '0' in binary, as opposed to '1' in decimal). Like the getQuantumRange function, it returns an array with two values, one being a long integer ('quantumDepthLong') and the other being a string ('quantumDepthLong'). The only difference, besides the variable types, is that the string version has a 'Q' prefixed to it.
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 Depth
    // ---------------------------------------------
    
  $imagick_type_quantum_depth = $imagick_type->getQuantumDepth();
  
    // Print Results
    // ---------------------------------------------
  print("<pre>");
  print_r($imagick_type_quantum_depth);
  print("</pre>");
?>
Output:
Array
(
  [quantumDepthLong] => 16
  [quantumDepthString] => Q16
)