png

Matplotlib Plots Lose Transparency When Saving as .ps/.eps

由 爷，独闯天下 提交于 2019-12-17 09:33:00
问题 I'm having an issue with attempting to save some plots with transparent ellipsoids on them if I attempt to save them with .ps/.eps extensions. Here's the plot saved as a .png: If I choose to save it as a .ps/.eps here is what it looks like: How I got around this, was to use ImageMagick to convert the original png to a ps. The only problem is that the image in png format is about 90k, and it becomes just under 4M after conversion. This is not good since I have a lot of these images, and it

How do I make a PNG resource?

由 和自甴很熟 提交于 2019-12-17 07:11:22
问题 I've got a form with a large TImage on it as a background. Problem is, this is stored directly in the DFM as a bitmap, which takes up about 3 MB. The original PNG file is ~250K. I'd like to try to reduce bloat by embedding the PNG in a resource, and then having the form load it during OnCreate . I can do that now that Delphi 2009 includes PNG support, except I don't quite know how to build a resource file with a PNG in it. Anyone know how that's done? 回答1: Example text file (named myres.rc):

How to set the image quality while converting a canvas with the “toDataURL” method?

由 妖精的绣舞 提交于 2019-12-17 06:31:54
问题 I want to set the quality factor when I encode a canvas element to jpg. var data = myCanvas.toDataURL( "image/jpeg" ); It does not give me a quality option. Is there an alternative library I can use? Related: what is the default quality setting used by the different browsers? 回答1: The second argument of the function is the quality. It ranges from 0.0 to 1.0 canvas.toDataURL(type,quality); Here you have extended information And I don't think it's possible to know the quality of the image once

How to set the image quality while converting a canvas with the “toDataURL” method?

由 喜夏-厌秋 提交于 2019-12-17 06:30:09
问题 I want to set the quality factor when I encode a canvas element to jpg. var data = myCanvas.toDataURL( "image/jpeg" ); It does not give me a quality option. Is there an alternative library I can use? Related: what is the default quality setting used by the different browsers? 回答1: The second argument of the function is the quality. It ranges from 0.0 to 1.0 canvas.toDataURL(type,quality); Here you have extended information And I don't think it's possible to know the quality of the image once

display huge Images in Android

由 这一生的挚爱 提交于 2019-12-17 06:27:10
问题 I'm intending to display very large Images in Android. My first solution - to supply them as pdf - fails because not every handheld got a pdf-viewer preinstalled, and I don't want to require the users to install one. So I have a png now (width = 3998px height=2827px) that I want to display. I downloaded this image to test how it would be displayed the gallery. It was quite painful. It seems that the galery renders this picture only once, and if I Zoom in, I cannot read the text at all. So I

Drag and drop batch file for multiple files?

由 ↘锁芯ラ 提交于 2019-12-17 03:08:30
问题 I wrote a batch file to use PngCrush to optimize a .png image when I drag and drop it onto the batch file. In the what's next section, I wrote about what I thought would be a good upgrade to the batch file. My question is: is it possible to create a batch file like I did in the post, but capable of optimizing multiple images at once? Drag and drop multiple .png files on it? (and have the output be something like new.png, new(1).png, new(2).png, etc... 回答1: Yes, of course this is possible.

How to convert a PNG image to a SVG? [closed]

由 对着背影说爱祢 提交于 2019-12-17 02:26:15
问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . Locked . This question and its answers are locked because the question is off-topic but has historical significance. It is not currently accepting new answers or interactions. How to convert a PNG image to a SVG? 回答1: There is a website where you can upload your image, and see the

Python爬取视频指南

由 风格不统一 提交于 2019-12-16 22:08:52
摘自：https://www.jianshu.com/p/9ca86becd86d 前言 前两天尔羽说让我爬一下菜鸟窝的教程视频，这次就跟大家来说说Python爬取视频的经验 正文 https://www.cniao5.com/ 菜鸟窝上有很多教程视频，但是这些视频好像没有直接的下载地址，而且有些教程视频还是有期限的，那么问题就产生了 我看的速度比较慢而且视频又很多，没等我看完视频就到期了怎么办？这时候写一个爬虫将这些教程视频下载下来就很好地解决了这个问题 当然，对于某些视频网站的VIP电影、视频之类的，一般情况下是无法在没有开通VIP的情况下用爬虫下载的，因为涉及到利益问题，同时数据传输也是加密的；想要看的话还是得开通会员再进行爬取 回到这次的目标上来，我们要爬取的是 https://www.cniao5.com/course/lessons/10153 上面的24章，共计202个教程视频 一 二 接下来我们来看看我们应该如何获取这些视频 首先我们看一下这个界面的源代码中没有关于课程视频的信息，那么我们点进去一个视频看看 三 通过开发者工具我们可以看到左侧都是这次加载视频是动态加载的信息，我们一个个来看 首先是url，我们可以看到这个链接是 Post 方式请求的（然鹅实际上再通过postman测试可以知道，并不用带上什么参数请求，吓唬人呢...） 四 五 这就是url返回的数据

What are the different usecases of PNG vs. GIF vs. JPEG vs. SVG?

由 谁说胖子不能爱 提交于 2019-12-16 19:57:55
问题 When should certain image file types be used when building websites or interfaces, etc? What are their points of strength and weakness? I know that PNG & GIF are lossless, while JPEG is lossy. But what is the main difference between PNG & GIF? Why should I prefer one over the other? What is SVG and when should I use it? If you don't care about each and every pixel, should you always use JPEG since it's the "lightest" one? 回答1: You should be aware of a few key factors... First, there are two

Nginx核心流程及模块介绍

由 亡梦爱人 提交于 2019-12-16 10:56:22
Nginx核心流程及模块介绍 1. Nginx简介以及特点 Nginx简介: Nginx (engine x) 是一个高性能的web服务器和反向代理服务器，也是一个IMAP/POP3/SMTP服务器 俄罗斯程序员Igor Sysoev于2002年开始 Nginx是增长最快的Web服务器，市场份额已达33.3％ 全球使用量排名第二2011年成立商业公司 Nginx社区分支： Openresty作者@agentzh(章宜春)开发的，最大特点是引入了ngx_lua模块，支持使用lua开发插件，并且集合了很多丰富的模块，以及lua库。 Tengine主要是淘宝团队开发。特点是融入了因淘宝自身的一些业务带来的新功能。 Nginx官方版本，更新迭代比较快，并且提供免费版本和商业版本。 Nginx源码结构： 代码量大约11万行C代码 源代码目录结构 core （主干和基础设置） event （事件驱动模型和不同的IO复用模块） http （HTTP服务器和模块） mail （邮件代理服务器和模块） os （操作系统相关的实现） misc （杂项） Nginx特点： 反向代理，负载均衡器 高可靠性、单master多worker模式 高可扩展性、高度模块化 非阻塞 事件驱动 低内存消耗 热部署 2. Nginx应用场景 场景如下： 静态文件服务器 反向代理，负载均衡 安全防御 智能路由
订阅 png