我使用ImageMagick将pdf文件转换为png（缩略图）图像，效果很好。我想知道是否可以将具有白色背景的pdf转换为具有透明背景的png文件（即，将所有白色像素设置为透明）。
这是我目前使用的PHP代码（结果是一个白色背景的png文件）：
/* Open first page of PDF file */
$im = new imagick($pdf_filepath . [0] );
/* Scale */
$im->thumbnailImage($width, $height);
/* Convert to png */
$im->setImageFormat( png );
/* Save file */
$result = $im->writeImage($thumbnail_filepath);
退房：http://imagemagick.org/Usage/channels/#mask_creation
我认为如果你愿意的话，你必须先把它创建成GIF，然后再回到png。
I am trying to write a script to prevent brute-force login attempts in a website I m building. The logic goes something like this: User sends login information. Check if username and password is ...
<?php $con=mysql_connect("localhost","mts","mts"); if(!con) { die( unable to connect . mysql_error()); } mysql_select_db("mts",$con); /* date_default_timezone_set ("Asia/Calcutta"); $date = ...
I found this script online that creates a thumbnail out of a image but the thumbnail image is created with poor quality how can I improve the quality of the image. And is there a better way to create ...
如何确认来自正确来源的数字。
Most sites need some way to show the dates on the site in the users preferred timezone. Below are two lists that I found and then one method using the built in PHP DateTime class in PHP 5. I need ...
I wonder there is a way to post a message to a facebook business page with cURL? thanks
I want to create text as a watermark for an image. the water mark should have the following properties front: Impact color: white opacity: 31% Font style: regular, bold Bevel and Emboss size: 30 ...
How does php cast boolean variables? I was trying to save a boolean value to an array: $result["Users"]["is_login"] = true; but when I use debug the is_login value is blank. and when I do ...