尽管PDF文档格式是公开的，不知为什么，Linux系统中的PDF阅读器总是不令人满意，特别是具有文档标注功能的。更奇怪的是，今天偶然搜到的PDF Studio具有这一功能，但之前搜索可编辑软件时，搜到的网页在比较各种阅读器时都没有提及它。
主页在（），下载后安装也很简单：sh ./PDFStudio_v8_x_x_linux.sh
安装后试了一下，常用的注释工具都有，复杂的自己用不到的没有细看。
在使用上还是稍有不变，比如，删除一个注释，没看到del的功能，尽管可以undo撤销，但undo和删除的含义和方便性是不用多说的。和Win下面的另一个工具PDF-XChange Viewer相比，功能性简单一些，比如颜色的设置，在PDF Studio里面有看到。
---------------------附：PDF Studio与Acrobat的比较
Compare PDF Studio Standard, PDF Studio Pro, Adobe Acrobat Standard, Adobe Acrobat Pro
| PDF Studio 8 Standard | PDF Studio 8 Pro | Adobe Acrobat Standard | Adobe Acrobat Pro | |
| Price | USD $89 | USD $129 | USD $299 | USD $449 |
|---|---|---|---|---|
| Operating Systems Supported |
Windows, Mac, Linux, Unix |
Windows, Mac, Linux, Unix Same key works on 2 computers, any operating system |
Windows, Mac Not Available on Linux, Unix |
Windows, Mac Not Available on Linux, Unix |
| View, print, and search PDF files |
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| Add or edit permissions & passwords |
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| Commenting tools: sticky notes, graphical annotations, audio comments, pencil tool to draw scribbles, typewriter tool to type text anywhere |
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| Add and edit hyperlinks |
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| Combine, split, rearrange documents |
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Portfolio - Flash required |
| Add file attachments |
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| Add text markups (highlights, underscore and strikethrough, replace, insert) |
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| Add text caret annotations ( text replace, text insert) usefull when reviewing documents |
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| Apply rubber stamps |
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Add custom stamps from image created in Adobe? Illustrator? |
Add custom stamps from image created in Adobe? Illustrator? |
| Export & Import Images |
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| Scan to PDF |
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| Optical character recognition (OCR) |
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| Design fillable interactive PDF forms |
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Coming in version 9 January 2014 |
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| Fill and save PDF forms |
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| Create PDF from other formats | From scan, Word, text, images* | From scan, Word, text, images* |
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| Correct text in original PDF content |
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| Modify images in original PDF content | Delete, move and resize | Delete, move and resize |
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| Comment review history |
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| Digitally sign PDF documents |
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| Certify PDF documents using digital IDs |
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| Preflight, PDF/X |
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| PDF bookmarks or outlines |
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| Precision measuring tools (distance, perimeter, area) |
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| PDF Optimizer (reduce file size) |
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| PDF linearization (for fast web view) |
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| Permanent redaction |
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Simple manual redaction Advanced redaction Coming in version 9 |
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| Loupe, Screenshot, Pan and zoom |
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| Tool chest (recent and preferred annotations) |
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| PDF comparison | Side by side comparison | Side by side comparison |
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| Work with batches of documents at a time |
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| Document services integration | Google Drive, Sharepoint | Google Drive, Sharepoint | Sharepoint, Acrobat.com | Sharepoint, Acrobat.com |
* Read more about free options to convert documents to PDF in our knowledge base.