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What is the Difference between ePUB and ePUB3?
ePUB 和 ePUB3 之间有什么区别？
- By SreePoorna 作者：SreePoorna
-
Updated on
March 1, 2023
更新于 2023 年 3 月 1 日
If you’re an aspiring author, you’ve probably heard of ePUB and ePUB3. But what’s the difference between the two? In this post, we’ll explain the critical differences between these two formats so that you can choose the right one for your needs.
如果您是一名有抱负的作者，您可能听说过 ePUB 和 ePUB3。但这两者之间有什么区别呢？在这篇文章中，我们将解释这两种格式之间的关键区别，以便您可以为自己的需求选择合适的格式。
ePUB and ePUB3 are eBook formats, adhering to specific standards set out by the International Digital Publishing Forum. While they are very similar in appearance, there are significant differences between how these specifications handle various aspects of eBook creation that can significantly affect what you see when viewing an eBook.
ePUB 和 ePUB3 是电子书格式，遵循国际数字出版论坛制定的特定标准。虽然它们在外观上非常相似，但这些规范处理电子书创建的各个方面的方式之间存在重大差异，这些差异可能会显著影响您在查看电子书时看到的内容。
What is an ePUB Format?
什么是 ePUB 格式？
ePUB is a digital file format used to create and distribute eBooks. It is a standard format that most eBook reading devices support.
ePUB 是用于创建和分发电子书的数字文件格式。它是大多数电子书阅读设备支持的标准格式。
The ePUB file format is best suitable for electronic publications with reflowable text. It is more like a marked-up document structure with associated images and illustrations.
ePUB 文件格式最适合具有可重排文本的电子出版物。它更像是一个带有相关图像和插图的标记文档结构。
The ePUB format is accepted and distributed by most major eBook stores and platforms, including Google, Apple’s iBooks, Barnes & Noble’s NOOK, and KOBO.
ePUB 格式被大多数主要电子书店和平台接受和分发，包括谷歌、苹果的 iBooks、巴诺斯和贵宾的 NOOK 以及 KOBO。
What is an ePUB 3 File?
什么是 ePUB 3 文件？
ePUB 3 is the latest version of ePUB, and it is an HTML5 standard-based file format. It allows the ePUB 3 files to contain videos, audio, and interactive multimedia elements. In a nutshell, it is an enhanced and more versatile version of the ePUB format. It allows for more multimedia content, interactivity, and animation.
ePUB 3 是 ePUB 的最新版本，它是基于 HTML5 标准的文件格式。它允许 ePUB 3 文件包含视频、音频和交互式多媒体元素。简而言之，它是 ePUB 格式的增强和更多功能的版本。它允许更多的多媒体内容、互动性和动画。
ePUB 3 format makes it perfect for digital textbooks, cookbooks, travel guides, and other types of interactive content. If you’re thinking about self-publishing an eBook or want to make your current eBook more engaging, you should consider using the ePUB 3 format.
ePUB 3 格式非常适合数字教科书、食谱、旅行指南和其他类型的互动内容。如果您正在考虑自行出版电子书或想要使您当前的电子书更具吸引力，您应该考虑使用 ePUB 3 格式。
ePUB 3 file is best suited for a fixed-layout eBook, which heavily depends on images and videos.
ePUB 3 文件最适合固定布局的电子书，这种电子书主要依赖于图像和视频。
The Features of both ePUB & ePUB 3 Versions
ePUB 和 ePUB 3 版本的特点
- One of the main benefits of the ePUB files for readers is that it allows a book’s text to automatically adjust or “reflow” for different screen sizes, such as those for smartphones, netbooks, and eReader devices.
对于读者来说，ePUB 文件的主要好处之一是，它允许书籍的文本根据不同的屏幕尺寸自动调整或“重新排列”，例如智能手机、上网本和电子阅读器等设备的屏幕尺寸。 - The ePUB version allows publishers to control document presentation through style sheets. ePUB 3 also provides audio, including synchronization of text and audio and text-to-speech synthesis.
ePUB 版本允许出版商通过样式表控制文档呈现。ePUB 3 还提供音频，包括文本和音频的同步以及文本转语音合成。
Differences between ePUB & ePUB 3 Versions
ePUB 和 ePUB 3 版本之间的区别
ePUB | ePUB 3 |
| ePUB 2 is an older format that was adopted by many organizations as their standard eBook format. ePUB 2 offers minimal controls for formatting text and images for its users. ePUB 2 是一种较旧的格式，被许多组织采用为其标准电子书格式。ePUB 2 为用户提供了最少的文本和图像格式控制。 | ePUB 3 offers greater flexibility in layout and typography, allowing publishers to create more sophisticated designs and page layouts. ePUB 3 在布局和排版方面提供了更大的灵活性，使出版商能够创建更复杂的设计和页面布局。 |
| ePUB 2 readers are not compatible with multimedia elements like videos,animations etc. Therefore, users need to confine themselves to reading non-interactive eBooks. ePUB 2 阅读器不兼容视频、动画等多媒体元素。因此，用户需要限制自己阅读非交互式电子书。 | ePUB 3 supports the embedding of audio, video, and media overlays. Since ePUB3 is based on the HTML5 format, it incorporates all of HTML5’s capabilities for rich media integration and interactivity. ePUB 3支持嵌入音频、视频和媒体叠加。由于ePUB3基于HTML5格式，它整合了HTML5的所有丰富媒体集成和互动功能。 |
| ePUB 2 does not support non-Latin script languages (Arabic, Chinese, Korean, etc.). ePUB 2 不支持非拉丁文字脚本语言（阿拉伯语、中文、韩文等）。 | ePUB 3 supports a wide range of languages. Books written in various languages are supported, as ePUB 3 has the capability to handle the flow of the text in RTL or LTR. ePUB 3 支持广泛的语言。支持使用各种语言编写的图书，因为 ePUB 3 具有处理文本从右到左或从左到右流的能力。 |
| Only JPG and PNG images are supported in ePUB 2. ePUB 2 仅支持 JPG 和 PNG 图像。 | ePUB 3 supports MathML and SVG to represent vector graphics inline within content. Pages will be lighter, thus reducing load time when we use the SVG element to draw shapes. ePUB 3 支持 MathML 和 SVG 以内联方式表示矢量图形。使用 SVG 元素绘制形状时，页面将更轻，从而减少加载时间。 |
| ePUB 2 does not support features related to accessibility and interactivity. ePUB 2 不支持与辅助功能和互动相关的功能。 | ePUB 3 incorporates various accessibility features such as support for alt text descriptions for images, enhanced navigation for readers with disabilities, and text-to-speech capabilities. ePUB 3 包含各种辅助功能，如支持图像的替代文本描述、增强的残障读者导航和文本转语音功能。 |
| ePUB 2 does not support fixed layout formats or read-aloud functionality.” ePUB 2 不支持固定布局格式或朗读功能。 | In ePUB 3, fixed layout is supported, and it provides various features for interactivity, including pop-up notes, hyperlinks, and interactive quizzes. 在 ePUB 3 中，支持固定布局，并提供各种互动功能，包括弹出式注释、超链接和互动测验。 |
- ePUB 2 does not support scripts and interactivity features. ePUB 3 version supports scripted content, i.e., interactivity, using JavaScript language.
ePUB 2 不支持脚本和交互功能。ePUB 3 版本支持使用 JavaScript 语言的脚本内容，即交互功能。 - ePUB 2 does not support the text-to-speech facility. ePUB 3 provides text-to-speech facility (Pronunciation Lexicons (PLS), Inline SSML Phonemes, CSS speech features). It also enables the usage of SMIL (Synchronized Multimedia Integration Language) for representation of synchronized text and audio.
ePUB 2 不支持文本转语音功能。ePUB 3 提供文本转语音功能（发音词典（PLS）、内联 SSML 音素、CSS 语音功能）。它还支持使用 SMIL（同步多媒体集成语言）来表示同步文本和音频。
The ePUB 3 is the latest version of ePUB which includes many new features:
ePUB 3 是 ePUB 的最新版本，包括许多新功能：
Better Accessibility 更好的可访问性
It also improves on previous versions by supporting a wider variety of fonts and text styles, allowing for more control over how your content looks when read.
它还通过支持更多种类的字体和文本样式改进了以前的版本，允许更多控制内容在阅读时的外观。
Global Language Support 全球语言支持
Offers compatibility for multiple languages. Books written in different languages (including Hebrew, Arabic, etc.) enable both left-to-right and right-to-left writing.
支持多种语言兼容性。用不同语言（包括希伯来语、阿拉伯语等）编写的书籍可以实现从左到右和从右到左的书写。
MathML Support MathML 支持
There is a direct embedding of MathML supported in ePub3, which makes it a perfect choice for science, math, and engineering textbooks.
ePub3 中支持直接嵌入 MathML，使其成为科学、数学和工程教科书的完美选择。
Suppose you are unsure which format to use to reach the widest audience possible with your eBook or digital publication. In that case, it may be worth looking into what each has to offer before making a decision – both formats have their advantages!
假设您不确定要使用哪种格式来最广泛地触及您的电子书或数字出版物的受众。在做出决定之前，值得了解每种格式提供了什么优势！
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