PHP Imagick getImageChannelStatistics()用法及代碼示例

Imagick::getImageChannelStatistics()函數是PHP中的內置函數，用於獲取圖像中每個通道的統計信息。

用法:

array Imagick::getImageChannelStatistics( void )

參數：該函數不接受任何參數。

異常：該函數在錯誤時引發ImagickException。

返回值：此函數返回一個以統計數據作為數組成員的數組。

以下示例程序旨在說明PHP中的Imagick::getImageChannelStatistics()函數：

示例1:

<?php 
  
// Create new imagick object 
$imagick = new Imagick( 
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-13.png'); 
  
// Get the statistics 
$statistics = $imagick->getImageChannelStatistics(); 
print("<pre>".print_r($statistics, true)."</pre>"); 
?>

輸出：

Array
(
    [0] => Array
        (
            [mean] => 0
            [minima] => 1.7976931348623E+308
            [maxima] => -1.7976931348623E+308
            [standardDeviation] => 0
            [depth] => 1
        )

    [1] => Array
        (
            [mean] => 56510.812968516
            [minima] => 0
            [maxima] => 65535
            [standardDeviation] => 20404.259764873
            [depth] => 8
        )

    [2] => Array
        (
            [mean] => 61143.413450883
            [minima] => 5654
            [maxima] => 65535
            [standardDeviation] => 10656.363052485
            [depth] => 8
        )

    [4] => Array
        (
            [mean] => 57923.358076397
            [minima] => 1799
            [maxima] => 65535
            [standardDeviation] => 17257.063161026
            [depth] => 8
        )

    [8] => Array
        (
            [mean] => 0
            [minima] => 0
            [maxima] => 0
            [standardDeviation] => 0
            [depth] => 1
        )

    [32] => Array
        (
            [mean] => 0
            [minima] => 1.7976931348623E+308
            [maxima] => -1.7976931348623E+308
            [standardDeviation] => 0
            [depth] => 1
        )

)

示例2:

<?php 
  
// Create new imagick object 
$imagick = new Imagick( 
'https://media.geeksforgeeks.org/wp-content/uploads/20190918234528/colorize1.png'); 
  
// Get the statistics 
$statistics = $imagick->getImageChannelStatistics(); 
print("<pre>".print_r($statistics, true)."</pre>"); 
?>

輸出：

Array
(
    [0] => Array
        (
            [mean] => 0
            [minima] => 1.7976931348623E+308
            [maxima] => -1.7976931348623E+308
            [standardDeviation] => 0
            [depth] => 1
        )

    [1] => Array
        (
            [mean] => 56510.812968516
            [minima] => 0
            [maxima] => 65535
            [standardDeviation] => 20404.259764873
            [depth] => 8
        )

    [2] => Array
        (
            [mean] => 61143.413450883
            [minima] => 5654
            [maxima] => 65535
            [standardDeviation] => 10656.363052485
            [depth] => 8
        )

    [4] => Array
        (
            [mean] => 65535
            [minima] => 65535
            [maxima] => 65535
            [standardDeviation] => 0
            [depth] => 1
        )

    [8] => Array
        (
            [mean] => 0
            [minima] => 0
            [maxima] => 0
            [standardDeviation] => 0
            [depth] => 1
        )

    [32] => Array
        (
            [mean] => 0
            [minima] => 1.7976931348623E+308
            [maxima] => -1.7976931348623E+308
            [standardDeviation] => 0
            [depth] => 1
        )

)

參考： https://www.php.net/manual/en/imagick.getimagechannelstatistics.php