Tag: 图像

为什么我需要@ 1x，@ 2x和@ 3x iOS图像？

为什么我们需要这3种特定的图像types？ 如果我的应用程序上有一个button，背景图像是50像素x 50像素，为什么我需要这个图像的3个版本？ 什么阻止了我制作一个高分辨率的图像，比如700×700，所以当它在任何一个iPhone上缩小的时候，它都不会落在设备所需的最大分辨率之下？ 只有我能想到的是它占用了更多的空间，但对于简单的应用程序/一个简单的button，它似乎不会引起任何问题。 我已经尝试了几个设备，当我模拟它，并执行此方法时，他们之间没有区别。 但是，当我更多地了解应用程序和内容时，我确信这项技术背后有内涵。

打印样式：如何确保图像不跨越分页符

在编写打印样式表时，有没有办法确保图像总是只在一个页面上，而不是跨越多个页面。 图像比页面小得多，但是基于文档stream，它们最终在页面的底部并被分割。 我看到的行为的一个例子如下： Page 1 | | | (text text text) | | (text text text) | | ________________ | | | Top of image | | |____________________| ——page break—— ____________________ Page 2 | | Rest of image | | | |________________| | | … | 我想要什么 Page 1 | | | (text text text) […]

图像与位图类

最近我一直在阅读我的C＃（我的团队正在慢慢转向C＃），并且无法理解Image类和Bitmap类之间的区别。 现在我知道Bitmapinheritance了Image类，但从我所了解的两者都非常相似。 任何人都可以点亮这个？

将base64中的string转换为图像并保存在Python中的文件系统上

我有一个base64格式的string，代表PNG图像。 有没有办法将这个图像保存到文件系统，作为一个PNG文件？ 我使用flex编码图像。 其实这是我得到的服务器上（任何提出的方法:(）后无法看到任何图像:(） 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垂直alignment图像在div中

我有图像垂直alignment在div中的问题 .img_thumb { float: left; height: 120px; margin-bottom: 5px; margin-left: 9px; position: relative; width: 147px; background-color: rgba(0, 0, 0, 0.5); border-radius: 3px; } .img_thumb img { display: block; margin-left: auto; margin-right: auto; vertical-align: middle; } <div class="img_thumb"> <a class="images_class" href="large.jpg" rel="images"><img src="small.jpg" title="img_title" alt="img_alt" /></a> </div> 据我所知，我需要“显示：块” 将图像定位在中心并且工作。 另外在教程中，我find了很多答案，但是它们并不“有用”，因为我的所有图像都不在同一个高度！

背景图像可以比div本身大吗？

我有一个100％宽度的页脚div。 它的高度大约是50px，这取决于它的内容。 是否有可能给这个#footer一个背景图像那种溢出这个div？ 图像大约是800x600px，我希望它位于页脚的左下angular。 它应该像我的网站的背景图像，但我已经在我的身体上设置了一个背景图像。 我需要另一个位于我的网站左下angular的图像和#footer div将是完美的。 #footer { clear: both; width: 100%; margin: 0; padding: 30px 0 0; background:#eee url(images/bodybgbottomleft.png) no-repeat left bottom fixed; } 图像设置为页脚，但不会溢出div。 是否有可能做到这一点？ overflow:visible不做的工作！

在完成页面加载后调用一个函数

我使用下面的代码来执行页面加载后的一些语句。 <script type="text/javascript"> window.onload = function () { newInvite(); document.ag.src="b.jpg"; } </script> 但是这个代码不能正常工作。 即使某些图像或元素正在加载，该函数也会被调用。 我想要的是调用页面加载完整的function。

JavaScript：获取图片尺寸

我只有一个图像的url。 我只需要使用JavaScript来确定这个图像的高度和宽度。 页面上的用户无法看到图像。 我怎样才能得到它的尺寸？

糟糕的OpenCL ImageSampling性能与OpenGL纹理采样

我最近将我的volumeraycaster从OpenGL移植到了OpenCL，这使得raycaster的性能降低了大约90％。 我跟踪了OpenCL的图像采样函数的性能下降，这些函数比相应的OpenGL纹理采样函数慢得多。 通过去除图像采样函数和纹理采样函数，两个raycaster实现具有相同的速度。 为了轻松实现不同硬件上的function，并排除其他RT代码中的一些愚蠢的错误，我写了一个小的基准，比较OpenCL采样速度和OpenGL采样速度，并在不同的机器上testing它， OpenCL仍然只有OpenGL性能的10％。 基准的OpenCL HostCode（至less是其中最重要的部分）： void OGLWidget::OCLImageSampleTest() { try { int size=8; float Values[4*size*size*size]; cl::Kernel kernel=cl::Kernel(program,"ImageSampleTest",NULL); cl::ImageFormat FormatA(CL_RGBA,CL_FLOAT); cl::Image3D CLImage(CLcontext, CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR ,FormatA,size,size,size,0,0,Values,NULL); cl::ImageFormat FormatB(CL_RGBA,CL_UNSIGNED_INT8); cl::Image2D TempImage(CLcontext, CL_MEM_WRITE_ONLY,FormatB,1024,1024,0,NULL,NULL ); kernel.setArg(0, CLImage); kernel.setArg(1, TempImage); cl::Sampler Samp; Samp() = clCreateSampler( CLcontext(), CL_TRUE, CL_ADDRESS_REPEAT, CL_FILTER_LINEAR, NULL); kernel.setArg(2, Samp); QTime BenchmarkTimer=QTime(); BenchmarkTimer.start(); cl::KernelFunctor func = kernel.bind(queue, […]

添加图像到轨道上的ruby布局

我想添加一个图像在我的模板ruby on rails项目，我当前有代码<img src="../../../publichttp://img.dovov.comrss.jpg" alt="rss feed" />在布局stores.html.erb文件但是这似乎并没有加载，因为它看起来像缺less一个路线，我不知道它应该是什么。 有什么想法吗？