如何从PDF文件提取图像? [英] How can I extract images from a PDF file?

问题描述

我需要从服务器上的PDF文件中提取所有图像.我不想要PDF页面，只想要原始大小和分辨率的图像.

I need to extract all the images from a PDF file on my server. I don't want the PDF pages, only the images at their original size and resolution.

我该如何使用Perl，PHP或任何其他基于UNIX的应用程序(我将通过PHP的exec函数调用它)来实现此目的?

How could I do this with Perl, PHP or any other UNIX based app (which I would invoke with the exec function from PHP)?

推荐答案

pdfimages 就是这样.它是poppler-utils和xpdf-utils软件包的一部分.

pdfimages does just that. It's is part of the poppler-utils and xpdf-utils packages.

从联机帮助页:

Pdfimages将可移植文档格式(PDF)文件中的图像另存为可移植Pixmap(PPM)，可移植位图(PBM)或JPEG文件.

Pdfimages saves images from a Portable Document Format (PDF) file as Portable Pixmap (PPM), Portable Bitmap (PBM), or JPEG files.

Pdfimages读取PDF文件，扫描一页或多页PDF文件并为每个图像image-root-nnn.xxx写入一个PPM，PBM或JPEG文件，其中nnn是图像编号，xxx是图像类型(.ppm，.pbm，.jpg).

Pdfimages reads the PDF file, scans one or more pages, PDF-file, and writes one PPM, PBM, or JPEG file for each image, image-root-nnn.xxx, where nnn is the image number and xxx is the image type (.ppm, .pbm, .jpg).

注意:pdfimages从PDF文件中提取原始图像数据，而无需执行任何其他转换. PDF内容流所做的任何旋转，剪切，颜色反转等操作都将被忽略.

NB: pdfimages extracts the raw image data from the PDF file, without performing any additional transforms. Any rotation, clipping, color inversion, etc. done by the PDF content stream is ignored.

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