将文档扫描成 PDF 格式很容易，但是能够把PDF转换过来吗？Gscan2pdf 采用光学识别软件对您的 PDF 文档进行扫描并将图像转换为文字。

gscan2pdf 1.0 改进变化：

* Deal with version information from PDF::API2

* Suppressed “End of file reached” message.

Closes Debian bug #622844

Thanks to Sebastian Schmidt for the patch

* Switch to OO interface for File::Temp, thus automatically clearing up

unneeded temporary files. Closes Debian bug #563461

* Removed all blocking progress dialogs

Closes Debian bug #577144

* + Spinbuttons to crop dialog

* + Edit/Select/No OCR

* + Edit/Clear OCR

Closes Debian bug #602578

* Combined Import and Open dialogs

Closes Debian bug #617886

* + Tesseract 3.01 support

* Fix embedding of UTF-8 OCR output

PPA源安装，打开终端输入命令：
sudo add-apt-repository ppa:jeffreyratcliffe/ppa
sudo apt-get update
sudo apt-get install gscan2pdf

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