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[translated]HOW TO USE WEBP IMAGES IN UBUNTU LINUX
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HOW TO USE WEBP IMAGES IN UBUNTU LINUX
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=========================================
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>Brief: This guide shows you how to view WebP images in Linux and how to convert WebP images to JPEG or PNG format.
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###WHAT IS WEBP?
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It’s been over five years since Google introduced [WebP file format][0] for images. WebP provides lossy and lossless compression and WebP compressed files are around 25% smaller in size when compared to JPEG compression, Google claims.
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Google aimed WebP to become the new standard for images on the web but I don’t see it happening. It’s over five years and it’s still not adopted as a standard except in Google’s ecosystem. But as we know, Google is pushy about its technologies. Few months back Google changed all the images on Google Plus to WebP.
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If you download those images from Google Plus using Google Chrome, you’ll have WebP images, no matter if you had uploaded PNG or JPEG. And that’s not the problem. The actual problem is when you try to open that files in Ubuntu using the default GNOME Image Viewer and you see this error:
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>**Could not find XYZ.webp**
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>**Unrecognized image file format**
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>GNOME Image Viewer doesn’t support WebP images
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In this tutorial, we shall see
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- how to add WebP support in Linux
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- list of programs that support WebP images
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- how to convert WebP images to PNG or JPEG
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- how to download WebP images directly as PNG images
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### HOW TO VIEW WEBP IMAGES IN UBUNTU AND OTHER LINUX
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[GNOME Image Viewer][3], the default image viewer in many Linux distributions including Ubuntu, doesn’t support WebP images. There are no plugins available at present that could enable GNOME Image Viewer to add WebP support.
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This means that we simply cannot use GNOME Image Viewer to open WebP files in Linux. A better alternative is [gThumb][4] that supports WebP images by default.
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To install gThumb in Ubuntu and other Ubuntu based Linux distributions, use the command below:
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```
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sudo apt-get install gthumb
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```
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Once installed, you can simply rightly click on the WebP image and select gThumb to open it. You should be able to see it now:
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>WebP image in gThumb
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### MAKE GTHUMB THE DEFAULT APPLICATION FOR WEBP IMAGES IN UBUNTU
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For Ubuntu beginners, if you like to make gThumb the default application for opening WebP files, just follow the steps below:
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#### Step 1: Right click on the WebP image and select Properties.
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>Select Properties from Right Click menu
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#### Step 2: Go to Open With tab, select gThumb and click on Set as default.
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>Make gThumb the default application for WebP images in Ubuntu
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### MAKE GTHUMB THE DEFAULT APPLICATIONS FOR ALL IMAGES
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gThumb has a lot more to offer than Image Viewer. For example, you can do simple editing, add color filters to the images etc. Adding the filter is not as effective as XnRetro, the dedicated tool for [adding Instagram like effects on Linux][5], but the basic filters are available.
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I liked gThumb a lot and decided to make it the default image viewer. If you also want to make gThumb the default application for all kind of images in Ubuntu, follow the steps below:
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####Step 1: Open System Settings
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#### Step 2: Go to Details.
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#### Step 3: Select gThumb as the default applications for images here.
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### ALTERNATIVE PROGRAMS TO OPEN WEBP FILES IN LINUX
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It is possible that you might not like gThumb. If that’s the case, you can choose one of the following applications to view WebP images in Linux:
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- [XnView][6] (Not open source)
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- GIMP with unofficial WebP plugin that can be installed via this [PPA][7] that is available until Ubuntu 15.10. I’ll cover this part in another article.
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- [Gwenview][8]
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### CONVERT WEBP IMAGES TO PNG AND JPEG IN LINUX
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There are two ways to convert WebP images in Linux:
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- Command line
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- GUI
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#### 1. USING COMMAND LINE TO CONVERT WEBP IMAGES IN LINUX
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You need to install WebP tools first. Open a terminal and use the following command:
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```
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sudo apt-get install webp
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```
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##### CONVERT JPEG/PNG TO WEBP
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We’ll use cwebp command (does it mean compress to WebP?) to convert JPEG or PNG files to WebP. The command format is like:
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```
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cwebp -q [image_quality] [JPEG/PNG_filename] -o [WebP_filename]
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```
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For example, you can use the following command:
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```
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cwebp -q 90 example.jpeg -o example.webp
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```
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##### CONVERT WEBP TO JPEG/PNG
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To convert WebP images to JPEG or PNG, we’ll use dwebp command. The command format is:
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```
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dwebp [WebP_filename] -o [PNG_filename]
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```
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An example of this command could be:
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```
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dwebp example.webp -o example.png
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```
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#### 2. USING GUI TOOL TO CONVERT WEBP TO JPEG/PNG
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For this purpose, we will use XnConvert which is a free but not open source application. You can download the installer files from their website:
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[Download XnConvert][1]
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Note that XnConvert is a powerful tool that you can use for batch resizing images. However, in this tutorial, we shall only see how to convert a single WebP image to PNG/JPEG.
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Open XnConvert and select the input file:
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In the Output tab, select the output format you want it to be converted. Once you have selected the output format, click on Convert.
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That’s all you need to do to convert WebP images to PNG, JPEg or any other image format of your choice.
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### DOWNLOAD WEBP IMAGES AS PNG DIRECTLY IN CHROME WEB BROWSER
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Probably you don’t like WebP image format at all and you don’t want to install a new software just to view WebP images in Linux. It will be a bigger pain if you have to convert the WebP file for future use.
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An easier and less painful way to deal with is to install a Chrome extension Save Image as PNG. With this extension, you can simply right click on a WebP image and save it as PNG directly.
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>Saving WebP image as PNG in Google Chrome
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[Get Save Image as PNG extension][2]
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### WHAT’S YOUR PICK?
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I hope this detailed tutorial helped you to get WebP support on Linux and helped you to convert WebP images. How do you handle WebP images in Linux? Which tool do you use? From the above described methods, which one did you like the most?
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----------------------
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via: http://itsfoss.com/webp-ubuntu-linux/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+ItsFoss+%28Its+FOSS%21+An+Open+Source+Blog%29
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作者：[Abhishek Prakash][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) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: http://itsfoss.com/author/abhishek/
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[0]: https://developers.google.com/speed/webp/
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[1]: http://www.xnview.com/en/xnconvert/#downloads
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[2]: https://chrome.google.com/webstore/detail/save-image-as-png/nkokmeaibnajheohncaamjggkanfbphi?utm_source=chrome-ntp-icon
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[3]: https://wiki.gnome.org/Apps/EyeOfGnome
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[4]: https://wiki.gnome.org/Apps/gthumb
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[5]: http://itsfoss.com/add-instagram-effects-xnretro-ubuntu-linux/
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[6]: http://www.xnview.com/en/xnviewmp/#downloads
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[7]: https://launchpad.net/~george-edison55/+archive/ubuntu/webp
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[8]: https://userbase.kde.org/Gwenview
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在 Ubuntu Linux 中使用 WEBP 图片
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=========================================
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>简介：这篇指南会向你展示如何在 Linux 下查看 WebP 图片以及将 WebP 图片转换为 JPEG 或 PNG 格式。
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### 什么是 WEBP？
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Google 为图片推出 [WebP 文件格式][0]已经超过五年了。Google 说，WebP 提供有损和无损压缩，相比 JPEG 压缩，WebP 压缩文件大小能更小约 25%。
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Google 的目标是让 WebP 成为 web 图片的新标准，但是我没能看到这一切发生。已经五年过去了，除了谷歌的生态系统以外它仍未被接受成为一个标准。但正如我们所知的，Google 对它的技术很有进取心。几个月前 Google 将 Google Plus 的所有图片改为了 WebP 格式。
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如果你用 Google Chrome 从 Google Plus 上下载那些图片，你会得到 WebP 图片，不论你之前上传的是 PNG 还是 JPEG。这都不是重点。真正的问题在于当你尝试着在 Ubuntu 中使用默认的 GNOME 图片查看器打开它时你会看到如下错误：
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> **Could not find XYZ.webp（无法找到 XYZ.webp）**
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> **Unrecognized image file format（未识别文件格式）**
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>GNOME 图片查看器不支持 WebP 图片
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在这个教程里，我们会看到
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- 如何在 Linux 中添加 WebP 支持
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- 支持 WebP 图片的程序列表
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- 如何将 WebP 图片转换到 PNG 或 JPEG
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- 如何将 WebP 图片直接下载为 PNG 格式
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### 如何在 Ubuntu 以及其它 Linux 发行版中查看 WebP 图片
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[GNOME 图片查看器][3]是许多 Linux 发行版的默认图片查看器，包括 Ubuntu，它不支持 WebP 图片。目前也没有可用的插件给 GNOME 图片查看器添加 WebP 支持。
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这无非是意味着我们不能在 Linux 上用 GNOME 图片查看器打开 WebP 文件而已。一个更好的替代品，[gThumb][4]，默认就支持 WebP 图片。
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要在 Ubuntu 以及其它基于 Ubuntu 的发行版上安装 gThumb 的话，使用以下命令：
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```
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sudo apt-get install gthumb
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```
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一旦安装完成，你就可以简单地右键点击 WebP 图片，选择 gThumb 来打开它。你现在应该可以看到如下画面：
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>gThumb 中显示的 WebP 图片
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### 让 gThumb 成为 Ubuntu 中 WebP 图片的默认应用
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对 Ubuntu 新手而言，如果你想要让 gThumb 成为打开 WebP 文件的默认应用，跟着以下步骤操作：
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#### 步骤 1：右键点击 WebP 文件选择属性。
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>从右键菜单中选择属性
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#### 步骤 2：转到打开方式标签，选择 gThumb 并点击设置为默认。
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>让 gThumb 成为 Ubuntu 中 WebP 图片的默认应用
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### 让 gThumb 成为所有图片的默认应用
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gThumb 的功能比图片查看器更多。举个例子，你可以做一些简单的编辑，给图片添加滤镜等。添加滤镜的效率没有 XnRetro（在[ Linux 下添加类似 Instagram 滤镜效果][5]的专用工具）那么高，但它还是有一些基础的滤镜可以用。
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我非常喜欢 gThumb 并且决定让它成为默认的图片查看器。如果你也想在 Ubuntu 中让 gThumb 成为所有图片的默认默认应用，遵照以下步骤操作：
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#### 步骤1：打开系统设置
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#### 步骤2：转到详情（Details）
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#### 步骤3：在这里将 gThumb 设置为图片的默认应用
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### Linux 上打开 WebP 文件的替代程序
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可能你不喜欢 gThumb。如果这样的话，你可以选择下列应用来在 Linux 中查看 WebP 图片：
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- [XnView][6]（非开源）
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- GIMP 加上非官方 WebP 插件，可以从这个 [PPA][7] 安装，支持到 Ubuntu 15.10。我会在另一篇文章里提到。
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- [Gwenview][8]
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### 在 Linux 中将 WebP 图片转换为 PNG 和 JPEG
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在 Linux 上转换 WebP 图片有两种途径：
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- 命令行
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- 图形界面
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#### 1.在 Linux 使用命令行转换 WebP 图片
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你需要先安装 WebP 工具。打开终端并使用下列命令：
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```
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sudo apt-get install webp
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```
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##### 将 JPEG/PNG 转换为 WebP
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我们将使用 cwebp 命令（它代表压缩为 WebP 吗？）来将 JPEG 或 PNG 文件转换为 WebP。命令格式是这样的：
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```
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cwebp -q [图片质量] [JPEG/PNG_文件名] -o [WebP_文件名]
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```
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举个例子，你可以使用下列命令：
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```
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cwebp -q 90 example.jpeg -o example.webp
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```
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##### 将 WebP 转换为 JPEG/PNG
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要将 WebP 图片转换为 JPEG 或 PNG，我们将使用 dwebp 命令。命令格式是：
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```
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dwebp [WebP_文件名] -o [PNG_文件名]
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```
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该命令的一个例子：
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```
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dwebp example.webp -o example.png
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```
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#### 2.使用图形工具将 WebP 转换为 JPEG/PNG
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要实现这个目标，我们要使用 XnConvert，它是免费的应用但不是开源的。你可以从他们的网站上下载安装文件：
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[下载 XnConvert][1]
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XnConvert 是个强大的工具，你可以用它来批量修改图片尺寸。但在这个教程里，我们只能看到如何将单个 WebP 图片转换为 PNG/JPEG。
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打开 XnConvert 并选择输入文件：
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在输出标签，选择你想要的输出格式。选择完后点击转换。
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要将 WebP 图片转换为 PNG，JPEG 或其它你选择的图片格式，这就是你所需要做的一切了。
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### 在 Chrome 浏览器中直接将 WebP 图片下载为 PNG
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也许你一点都不喜欢 WebP 图片格式，也不想在 Linux 仅仅为了查看 WebP 图片而安装一个新软件。如果你不得不将 WebP 文件转换以备将来使用，这会是件更痛苦的事情。
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一个解决这个问题更简单，不那么痛苦的途径是安装一个 Chrome 扩展 Save Image as PNG。有了这个插件，你可以右键点击 WebP 图片并直接存储为 PNG 格式。
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>在 Google Chrome 中将 WebP 图片保存为 PNG 格式
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[获取 Save Image as PNG 扩展][2]
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### 你的选择是？
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我希望这个详细的教程能够帮你在 Linux 上获取 WebP 支持并帮你转换 WebP 图片。你在 Linux 怎么处理 WebP 图片？你使用哪个工具？以上描述的方法中，你最喜欢哪一个？
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----------------------
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via: http://itsfoss.com/webp-ubuntu-linux/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+ItsFoss+%28Its+FOSS%21+An+Open+Source+Blog%29
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作者：[Abhishek Prakash][a]
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译者：[alim0x](https://github.com/alim0x)
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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) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: http://itsfoss.com/author/abhishek/
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[0]: https://developers.google.com/speed/webp/
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[1]: http://www.xnview.com/en/xnconvert/#downloads
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[2]: https://chrome.google.com/webstore/detail/save-image-as-png/nkokmeaibnajheohncaamjggkanfbphi?utm_source=chrome-ntp-icon
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[3]: https://wiki.gnome.org/Apps/EyeOfGnome
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[4]: https://wiki.gnome.org/Apps/gthumb
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[5]: http://itsfoss.com/add-instagram-effects-xnretro-ubuntu-linux/
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[6]: http://www.xnview.com/en/xnviewmp/#downloads
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[7]: https://launchpad.net/~george-edison55/+archive/ubuntu/webp
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[8]: https://userbase.kde.org/Gwenview
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