Support questions and answers for software by RL Vision.
The difference in result is probably due to the fact that bmp images are not
compressed. Images in pdfs are compressed, even if they are stored in a
lossless format. They can also be 8 (or less) bits, but the bmps are 24
PDF Wiz is actually only a frontend for another command line program. I
haven't created this program, so I can't tell you exactly what is happening
under the hood.
----- Original Message -----
Sent: Friday, April 21, 2006 8:57 PM
Subject: Re: Question about PDF Image Extraction Wizard
> > On Fri, Apr 21, 2006 at 08:33:49PM +0200, RL wrote:
>> > > PDF files can store images in both jpg and lossless format (usually both
>> > > depending on the type of image). It is up to the PDF creator software to
>> > > decide which format to use. PDF Wiz will extract all images in the
>> > > they are stored inside the file. It does not recompress any images.
> > Hi Dan, and thanks for responding.
> > As an example, the source PDF I am using is 24.9MB. PDF Image Extraction
> > Wizard produces a mixture of JPEGs and BMPs that total 324MB.
> > If I zip the resulting images with maximum compression, the resulting file
> > is 81.9MB. Using RAR with best compression results in a 71.7MB archive.
> > It seems like either something's not quite right with the output of your
> > software, or PDF has some kind of crazy magical compression algorithm for
> > images :-) , or something else is going on that I don't understand.
> > The example PDF is a scan of an old magazine, one image per page in the
> > You can download it for yourself here:
> > http://www.deadwoodinc.net/amigan/acar/jan96.part1.rar
> > http://www.deadwoodinc.net/amigan/acar/jan96.part2.rar
> > --
> > Troy
> > *****@*****
> > http://www.tdavis.org/