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Imagick::getQuantumDepth

(PECL imagick 2, PECL imagick 3)

Imagick::getQuantumDepthGets 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/Exceções

Lança uma exceção ImagickException em caso de erro.

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holdoffhunger at gmail dot com
12 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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