[Blindmath] Extracting bitmap images from pdf files

[Amanda Lacy]

Might we get a positive response from Adobe if we contacted them regarding 
this problem? I'm not the only one facing it.

Amanda
----- Original Message ----- 
From: "Richard Baldwin" <baldwin at dickbaldwin.com>
To: "Jamal Mazrui" <empower at smart.net>
Cc: "Blind Math list for those interested in mathematics" 
<blindmath at nfbnet.org>
Sent: Friday, January 27, 2012 9:28 AM
Subject: Re: [Blindmath] Extracting bitmap images from pdf files


> Hi Jamal,
>
> It is a great program, easy to use, and probably totally accessible. I
> particularly like the fact that the program doesn't require a windows
> installation. The output data is well organized and including the page
> numbers in the bmp file names is a great help in analyzing them.
>
> Unfortunately, the output produced by the program suffers from the same
> issues that I have encountered with all of the other image extractor
> programs that I have tried. A few of the images come out intact. Most of
> the images don't come out intact.
>
> For example, page three of one of the pdf files that I tested has a single
> image of a battery. It is the same image that I enhanced and posted in an
> earlier post. Your program produced 54 bmp files for that page. A few of
> them were icons such as arrows exclamation marks, etc. The remaining bmp
> files appear to be a very small pieces of the image of the battery. By the
> way, I got the earlier image of the battery by taking a screen shot of the
> page and using an image editing program to crop out the battery image. 
> None
> of the image extraction programs that I have tested extract the image
> intact.
>
> I don't know anything at all about the internal structure of pdf files, 
> and
> this behavior of breaking an image into many small pieces may depend on 
> how
> the file is constructed in the first place. In any event, my immediate
> problem has to do with a specific set of pdf files that are the chapters
> from a specific physics book, so this program doesn't solve my problem.
>
> Thanks for offering the program.
> Dick Baldwin
>
> On Fri, Jan 27, 2012 at 5:18 AM, Jamal Mazrui <empower at smart.net> wrote:
>
>> In an attempt to facilitate a free, non-web dependent solution, I have
>> written a Windows console-mode utility called PDF2Images, built with
>> PowerBASIC and a PDF library.  The distribution archive, including
>> documentation and source code, is available at
>>
>> http://empowermentzone.com/**pdf2images.zip<http://empowermentzone.com/pdf2images.zip>
>>
>> I am interested in any feedback on how well it works compared to other
>> approaches.
>>
>> Jamal
>>
>>
>>
>
>
> -- 
> Richard G. Baldwin (Dick Baldwin)
> Home of Baldwin's on-line Java Tutorials
> http://www.DickBaldwin.com
>
> Professor of Computer Information Technology
> Austin Community College
> (512) 223-4758
> mailto:Baldwin at DickBaldwin.com
> http://www.austincc.edu/baldwin/
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