PHP Gmagick setimageresolution()用法及代码示例

Gmagick::setimageresolution()函数是PHP中的内置函数，用于设置图像对象的分辨率。

用法:

Gmagick Gmagick::setImageResolution($x_resolution, $y_resolution)

参数：该函数接受上述和以下所述的两个参数：

$x_resolution:这是必填参数，用于指定x轴分辨率。
$y_resolution:这是必需的参数，用于指定y轴分辨率。

返回值：成功时，此函数返回Gmagick对象。

以下示例程序旨在说明PHP中的Gmagick::setimageresolution()函数：

程序1:
原始图片：

<?php 
  
$gmagick = new Gmagick( 
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-15.png'); 
  
// Getting Resolution of image 
// using getimageresolution function 
$res = $gmagick->getImageResolution(); 
echo "X = ".$res['x'] . "</br>"; 
echo "Y = ".$res['y'] . "</br>"; 
  
// Function to set image resolution 
$gmagick->setimageresolution(50, 50); 
  
  
echo "After Set Resolution: </br>"; 
  
// Getting Resolution of image 
// using getimageresolution function 
$res = $gmagick->getImageResolution(); 
echo "X = " . $res['x'] . "</br>"; 
echo "Y = " . $res['y'] . "</br>"; 
?>

输出：

X = 37.8
Y = 37.8
After Set Resolution:
X = 50
Y = 50

程序2:
原始图片：

<?php  
$string = "Computer Science portal for Geeks!";  
     
// Creating new image of above String  
// and add color and background  
$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); 
echo "Before: </br>"; 
  
// Getting Resolution of created image 
// using getimageresolution function 
$res = $im->getImageResolution(); 
echo "X = ".$res['x'] . "</br>"; 
echo "Y = ".$res['y'] ." </br>"; 
  
  
// Set image resolution (50, 50)  
$im->setimageresolution(50, 50);  
  
echo "After:</br> "; 
  
// Getting Resolution of created image 
// using getimageresolution function 
$res = $im->getImageResolution(); 
echo "X = ".$res['x'] . "</br>"; 
echo "Y = ".$res['y'] ." </br>"; 
?>

输出：

Before:
X = 0
Y = 0
After:
X = 50
Y = 50

参考： http://php.net/manual/en/gmagick.setimageresolution.php

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注：本文由纯净天空筛选整理自R_Raj大神的英文原创作品 PHP | Gmagick setimageresolution() Function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。