PHP Imagick getImageChannelStatistics()用法及代码示例

Imagick::getImageChannelStatistics()函数是PHP中的内置函数，用于获取图像中每个通道的统计信息。

用法:

array Imagick::getImageChannelStatistics( void )

参数：该函数不接受任何参数。

异常：该函数在错误时引发ImagickException。

返回值：此函数返回一个以统计数据作为数组成员的数组。

以下示例程序旨在说明PHP中的Imagick::getImageChannelStatistics()函数：

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>"); 
?>

输出：

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>"); 
?>

输出：

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
        )

)

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