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Set transparent background using ImageMagick and commandline prompt
Suppose you have any image (PNG or JPG).
This image has a white background and I need to make this background transparent.
...
How to make input type= file Should accept only pdf and xls
... check a file based on the extension. What about a executable named lolcat.jpg?
– feeela
Aug 27 '12 at 13:14
1
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PDB文件：每个开发人员都必须知道的 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...二 PDB文件的内容
正式开始PDB的内容，PDB不是公开的文件格式，但是Microsoft提供了API来帮助从PDB中获取数据。
Native C++ PDB包含了如下的信息：
* public，private 和static函数地址；
* 全局变量的名字和地址；
* 参数和局部变量...
Stretch and scale CSS background
...mplish this by using background-size:
body {
background-image: url(bg.jpg);
background-size: cover;
}
cover means stretching the image either vertically or horizontally so it never tiles/repeats.
That would work for Safari 3 (or later), Chrome, Opera 10+, Firefox 3.6+, and Internet Expl...
Paperclip::Errors::MissingRequiredValidatorError with Rails 4
...ype
validates_attachment_content_type :image, :content_type => ["image/jpg", "image/jpeg", "image/png", "image/gif"]
-OR- another way
validates_attachment :image, content_type: { content_type: ["image/jpg", "image/jpeg", "image/png", "image/gif"] }
-OR- yet another way
is to use regex for ...
Force browser to download image files on click
...in hrefs. So if you want to create <a href="https://i.imgur.com/IskAzqA.jpg" download> on a domain other than imgur.com it will not work as intended. Chrome deprecations and removals announcement
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Bash: Copy named files recursively, preserving folder structure
...ports that, but that works on Linux.
cp --parents src/prog.js images/icon.jpg /tmp/package
If that doesn't work on OS X, try
rsync -R src/prog.js images/icon.jpg /tmp/package
as aif suggested.
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Two forward slashes in a url/src/href attribute [duplicate]
...e referenced by non protocol relative URLs (i.e. http://example.com/banner.jpg), customers reaching the https enabled checkout will be greeted with a rather unfriendly
"there are insecure elements on this page"
prompt - which, as you can imagine, throws the average non-tech-savvy person off.
If th...
Saving image from PHP URL
... the image http://example.com/fetch-image.php?url=http://blabla.com/flower.jpg. In the case of this example, you could just call $_GET['url'] in your PHP script, like so: $ch = curl_init($_GET['url']);.
– Mathias Bynens
Nov 29 '09 at 13:04
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可重入函数、不可重入函数及线程安全 - C/C++ - 清泛网 - 专注C/C++及内核技术
...全的同时被多个线程调用，那么，这个不可重入函数就是转换成了线程安全。
线程安全，描述的是函数能同时被多个线程安全的调用，并不要求调用函数的结果具有可再现性。也就是说，多个线程同时调用该函数，允许出现互...