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Imagick::getQuantumDepth

(PECL imagick 2, PECL imagick 3)

Imagick::getQuantumDepth — Gets the quantum depth

Descrição

public static Imagick::getQuantumDepth(): array

Returns the Imagick quantum depth.

Parâmetros

Esta função não possui parâmetros.

Valor Retornado

Returns an array with "quantumDepthLong" and "quantumDepthString" members.

Erros

Lança uma exceção ImagickException em caso de erro.

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User Contributed Notes 1 note

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holdoffhunger at gmail dot com ¶

11 years ago


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
)

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