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PHP Gmagick getimagechanneldepth()用法及代碼示例


Gmagick::getimagechanneldepth()函數是PHP中的內置函數,用於返回通道圖像的深度。

用法:

int Gmagick::getimagechanneldepth( $channel_type )

參數:該函數接受單個參數$channel_type,該參數保存對通道模式有效的通道常數。頻道的默認值為Gmagick::CHANNEL_DEFAULT。


返回值:此函數返回通道深度。

以下示例程序旨在說明PHP中的Gmagick::getimagechanneldepth()函數:

原始圖片1:
https://media.geeksforgeeks.org/wp-content/uploads/geeks-21.png
程序1:

<?php 
   
// Create new Gmagick object 
$im = new Gmagick( 
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-15.png'); 
   
// Using getimagechanneldepth function 
// with different channel 
echo $im->getimagechanneldepth(Gmagick::CHANNEL_RED) . "</br>"; 
echo $im->getimagechanneldepth(Gmagick::CHANNEL_GRAY) . "</br>"; 
echo $im->getimagechanneldepth(Gmagick::CHANNEL_CYAN) . "</br>"; 
echo $im->getimagechanneldepth(Gmagick::CHANNEL_GREEN) . "</br>"; 
echo $im->getimagechanneldepth(Gmagick::CHANNEL_BLUE) . "</br>"; 
  
?>

輸出:

8
8
8
8
8

原始圖片2:
https://media.geeksforgeeks.org/wp-content/uploads/Screenshot-from-2018-10-16-23-23-54.png
程序2:

<?php  
   
$string = "Computer Science portal for Geeks!";  
   
// Creating new image of above String  
// and add color 
$im = new Gmagick();  
$draw = new GmagickDraw();  
   
// Fill the color in image  
$draw->setFillColor(new GmagickPixel('green'));  
   
// Set the text font size  
$draw->setFontSize(50);  
   
$metrix = $im->queryFontMetrics($draw, $string);  
$draw->annotation(0, 40, $string);  
$im->newImage($metrix['textWidth'], $metrix['textHeight'],  
        new GmagickPixel('white'));  
  
// Draw the image          
$im->drawImage($draw);  
$im->setImageFormat('jpeg');  
   
// Using getImageChannelDepth function 
// with different channel 
echo $im->getimagechanneldepth(Gmagick::CHANNEL_RED) . "</br>"; 
echo $im->getimagechanneldepth(Gmagick::CHANNEL_GRAY) . "</br>"; 
echo $im->getimagechanneldepth(Gmagick::CHANNEL_CYAN) . "</br>"; 
echo $im->getimagechanneldepth(Gmagick::CHANNEL_GREEN) . "</br>"; 
echo $im->getimagechanneldepth(Gmagick::CHANNEL_BLUE) . "</br>"; 
?>

輸出:

8
8
8
16
8

參考: http://php.net/manual/en/gmagick.getimagechanneldepth.php



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注:本文由純淨天空篩選整理自R_Raj大神的英文原創作品 PHP | Gmagick getimagechanneldepth() Function。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。