I need help - I can help - Problem extracting images

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Problem extracting images

Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=1794
Printed Date: 13 Dec 25 at 3:05PM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: Problem extracting images

Posted By: michaelasi
Subject: Problem extracting images
Date Posted: 06 Apr 11 at 9:49AM

Hi, I am extracting images from PDF files that were created elsewhere with GhostScript Writer 8. I am first merging a number of PDF files using MergeFileList.

I am able to extract the images to an imagelist etc and use DASaveImageDataToFile to save each extracted image to file. However, some of the image files are completely blank (i.e. the image can't be seen when you view the file - just a white background). Other images are extracted perfectly well. All of the images in the file are of the same type.

Has anyone seen this before or have any ideas on why some images are extracted successfully and others are blank? Thanks in advance for your help.

Replies:

Posted By: Ingo
Date Posted: 06 Apr 11 at 12:02PM

Hi Michael!

These images you can see in the file explorer with max 1 kb...
I think it's made beside the creation of the document.
Perhaps only one completely transparent gif-pixel.
But it's an image and so it will be extracted.
If you want to avoid this you can check the file size before save to disk.

Cheers and welcome here,
Ingo

Posted By: michaelasi
Date Posted: 06 Apr 11 at 1:49PM

Hi Ingo,

Thank you for your feedback. I have since discovered that the problem only occurs with pdf files that were produced by GPL Ghostscript 8.15. The workaround that works is to save them as word documents and then save those word documents back to pdf format.

Thanks again,

Michael.