php – 图像处理宽度和高度设置

在我的项目中我只是做图像水印或图像结合它的工作正常和代码.

<!DOCTYPE html>
<html>
<head>
<title>test</title>
</head>
<body>
<?PHP
if(isset($_POST['submit']))
{
// Give the Complete Path of the folder where you want to save the image    
$folder="uploads/";
move_uploaded_file($_FILES["fileToUpload"]["tmp_name"],"$folder".$_FILES["fileToUpload"]["name"]);
$file='uploads/'.$_FILES["fileToUpload"]["name"];

$uploadimage=$folder.$_FILES["fileToUpload"]["name"];
$newname= time();

$ext = pathinfo($_FILES["fileToUpload"]["name"],PATHINFO_EXTENSION);

// Set the thumbnail name
$thumbnail = $folder.$newname.".".$ext; 
$imgname=$newname.".".$ext;

// Load the mian image
if ($ext=="png" || $ext=="PNG") {
$source = imagecreatefrompng($uploadimage);
}
else if ($ext=="gif" || $ext=="GIF") {
$source = imagecreatefromgif($uploadimage);
}
else if ($ext=="bmp" || $ext=="BMP") {
$source = imagecreatefrombmp($uploadimage);
}
else{
$source = imagecreatefromjpeg($uploadimage);
}

// load the image you want to you want to be watermarked
$watermark = imagecreatefrompng('uploads/logo1.png');

// get the width and height of the watermark image
$water_width = imagesx($source)/2;
$water_height = imagesy($watermark);

// get the width and height of the main image image
$main_width = imagesx($source);
$main_height = imagesy($source);

$im_middle_w = $main_width/2;
$im_middle_h = $main_height/2;

// Set the dimension of the area you want to place your watermark we use 0
// from x-axis and 0 from y-axis 
$dime_x = $im_middle_w - $water_width/2;
$dime_y = $im_middle_h - $water_height/2;

// copy both the images
imagecopy($source,$watermark,$dime_x,$dime_y,$water_width,$water_height);

// Final processing Creating The Image
imagejpeg($source,$thumbnail,100);
unlink($file);
}
?>
<img src='uploads/<?PHP echo $imgname;?>'>
</body>
</html>

但设置$water_width的问题,我想设置为我的源图像的一半.但是当我有一个宽度较小或宽度较宽的源图像与$water_width相比时,就像这样设置它.当源图像宽度更大时查看图像.

当宽度较小时.

所以我的问题是如何将$water_width设置为源图像宽度的一半？

通过亚历克斯你的回答它就像这样.

这会将水印调整为原始图像的半角,并将其放在中心位置：

// load the image you want to you want to be watermarked
$watermark = imagecreatefrompng('uploads/logo1.png');

// get the width and height of the watermark image
$water_width = imagesx($watermark);
$water_height = imagesy($watermark);

// get the width and height of the main image image
$main_width = imagesx($source);
$main_height = imagesy($source);

// resize watermark to half-width of the image
$new_height = round($water_height * $main_width / $water_width / 2);
$new_width = round($main_width / 2);
$new_watermark = imagecreatetruecolor($new_width,$new_height);
// keep transparent background
imagealphablending( $new_watermark,false );
imagesavealpha( $new_watermark,true );

imagecopyresampled($new_watermark,$new_width,$new_height,$water_height);

// Set the dimension of the area you want to place your watermark we use 0
// from x-axis and 0 from y-axis 
$dime_x = round(($main_width - $new_width)/2);
$dime_y = round(($main_height - $new_height)/2);

// copy both the images
imagecopy($source,$new_watermark,$new_height);

// Final processing Creating The Image
imagejpeg($source,100);

imagedestroy($source);
imagedestroy($watermark);
imagedestroy($new_watermark);

原文链接：https://www.f2er.com/php/135096.html

php – 图像处理宽度和高度设置

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