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Translating by GOLinux!
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How to automatically dim your screen on Linux
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When you start spending the majority of your time in front of a computer, natural questions start arising. Is this healthy? How can I diminish the strain on my eyes? Why is the sunlight burning me? Although active research is still going on to answer these questions, a lot of programmers have already adopted a few applications to make their daily habits a little healthier for their eyes. Among those applications, there are two which I found particularly interesting: Calise and Redshift.
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### Calise ###
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In and out of development limbo, [Calise][1] stands for "Camera Light Sensor." In other terms, it is an open source program that computes the best backlight level for your screen based on the light intensity received by your webcam. And for more precision, Calise is capable of taking in account the weather in your area based on your geographical coordinates. What I like about it is the compatibility with every desktops, even non-X ones.
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It comes with a command line interface and a GUI, supports multiple user profiles, and can even export its data to CSV. After installation, you will have to calibrate it quickly before the magic happens.
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What is less likeable is unfortunately that if you are as paranoid as I am, you have a little piece of tape in front of your webcam, which greatly affects Calise's precision. But that aside, Calise is a great application, which deserves our attention and support. As I mentioned earlier, it has gone through some rough patches in its development schedule over the last couple of years, so I really hope that this project will continue.
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### Redshift ###
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If you already considered decreasing the strain on your eyes caused by your screen, it is possible that you have heard of f.lux, a free proprietary software that modifies the luminosity and color scheme of your display based on the time of the day. However, if you really prefer open source software, there is an alternative: [Redshift][2]. Inspired by f.lux, Redshift also alters the color scheme and luminosity to enhance the experience of sitting in front of your screen at night. On startup, you can configure it with you geographic position as longitude and latitude, and then let it run in tray. Redshift will smoothly adjust the color scheme or your screen based on the position of the sun. At night, you will see the screen's color temperature turn towards red, making it a lot less painful for your eyes.
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Just like Calise, it proposes a command line interface as well as a GUI client. To start Redshift quickly, just use the command:
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$ redshift -l [LAT]:[LON]
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Replacing [LAT]:[LON] by your latitude and longitude.
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However, it is also possible to input your coordinates by GPS via the gpsd module. For Arch Linux users, I recommend this [wiki page][3].
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### Conclusion ###
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To conclude, Linux users have no excuse for not taking care of their eyes. Calise and Redshift are both amazing. I really hope that their development will continue and that they get the support they deserve. Of course, there are more than just two programs out there to fulfill the purpose of protecting your eyes and staying healthy, but I feel that Calise and Redshift are a good start.
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If there is a program that you really like and that you use regularly to reduce the strain on your eyes, please let us know in the comments.
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--------------------------------------------------------------------------------
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via: http://xmodulo.com/automatically-dim-your-screen-linux.html
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作者：[Adrien Brochard][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://xmodulo.com/author/adrien
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[1]:http://calise.sourceforge.net/
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[2]:http://jonls.dk/redshift/
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[3]:https://wiki.archlinux.org/index.php/Redshift#Automatic_location_based_on_GPS
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Linux上如何让屏幕自动变暗
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当你开始在计算机前花费大量时间的时候，自然的问题开始显现。这健康吗？怎样才能舒缓我眼睛的压力呢？为什么太阳光灼烧着我？尽管解答这些问题的研究仍然在活跃进行着，许多程序员已经采用了一些应用来让他们的日常习惯对他们的眼睛更健康点。在这些应用中，我发现了两个特别有趣的东西：Calise和Redshift。
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### Calise ###
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在开发状态之中和之外，[Calise][1]都表示“相机光感应器”。换句话说，它是一个开源程序，用于基于摄像头接收到的光密度计算屏幕最佳的背景光级别。更精确地说，Calise可以基于你的地理坐标来考虑你所在地区的天气。我喜欢它是因为它兼容各个桌面，甚至非X系列。
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它同时附带了命令行界面和图形界面，支持多用户配置，而且甚至可以导出数据为CSV。安装完后，你必须在魔法展开前快速进行校正。
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不怎么令人喜欢的是，如果你和我一样偏执，在你的摄像头前面贴了一条胶带，那就会比较不幸了，这会大大影响Calise的精确度。除此之外，Calise还是个很棒的应用，值得我们关注和支持。正如我先前提到的，它在过去几年中经历了一段修修补补的艰难阶段，所以我真的希望这个项目继续开展下去。
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### Redshift ###
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如果你已经考虑好要减少由屏幕导致的眼睛的压力，那么你很可能听过f.lux，它是一个免费的专有软件，用于根据一天中的时间来修改显示器的亮度和配色。然而，如果真的偏好于开源软件，那么一个可选方案就是：[Redshift][2]。灵感来自f.lux，Redshift也可以改变配色和亮度来加强你夜间坐在屏幕前的体验。启动时，你可以配置使用经度和纬度来配置地理坐标，然后就可以让它在托盘中运行了。Redshift将根据太阳的位置平滑地调整你的配色或者屏幕。在夜里，你可以看到屏幕的色温调向偏暖色，这会让你的眼睛少遭些罪。
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和Calise一样，它提供了一个命令行界面，同时也提供了一个图形客户端。要快速启动Redshift，只需使用命令：
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$ redshift -l [LAT]:[LON]
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替换[LAT]:[LON]为你的维度和经度。
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然而，它也可以通过gpsd模块来输入你的坐标。对于Arch Linux用户，我推荐你读一读这个[维基页面][3]。
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### 尾声 ###
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总而言之，Linux用户没有理由不去保护自己的眼睛，Calise和Redshift两个都很棒。我真希望它们的开发能够继续下去，他们能获得应有的支持。当然，还有比这两个更多的程序可以满足保护眼睛和保持健康的目的，但是我感觉Calise和Redshift会是一个不错的开始。
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如果你有一个真正喜欢的程序，而且也经常用它来舒缓眼睛的压力，请在下面的评论中留言吧。
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--------------------------------------------------------------------------------
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via: http://xmodulo.com/automatically-dim-your-screen-linux.html
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作者：[Adrien Brochard][a]
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译者：[GOLinux](https://github.com/GOLinux)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://xmodulo.com/author/adrien
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[1]:http://calise.sourceforge.net/
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[2]:http://jonls.dk/redshift/
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[3]:https://wiki.archlinux.org/index.php/Redshift#Automatic_location_based_on_GPS
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