我为我的网站做的工作很少，我想自动调整我的图像大小。。但不仅可以自动调整大小，还可以保持它们的比例，即使我调整了它们的宽度或高度。我想添加额外的白色边框来补偿新的空间。
我过去从未做过任何图像工作，我应该如何处理这个问题？
计算高度，假设宽度合适，然后将其与容器的高度进行核对。如果它更高，那么计算宽度以使高度合适：
newHeight = oldHeight * containerWidth / oldWidth;
if (newHeight <= containerHeight) {
newWidth = containerWidth;
} else {
newWidth = oldWidth * containerHeight / oldHeight;
newHeight = containerHeight;
}
现在，您可以计算将图像放置在何处以使其居中：
x = (containerWidth - newWidth) / 2;
y = (containerHeight - newHeight) / 2;
如果你在谈论单源成像，即上传主图像并通过查询字符串请求其版本，那么我可以提供帮助。
我是http://imageresizing.net/一这是一个由附加插件资助的开源库。
您想要的功能包含在免费核心中——只需安装并添加？宽度=100&；height=100到任何图像URL。
用ASP.NET进行图像处理。NET非常棘手。除非你有很强的Win/C++背景，否则你真的不应该这样做。NET不垃圾回收系统。绘图实例。
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