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MS Office Forum / General PowerPoint Questions / May 2006Locating images in a powerpoint
Hi ... Does anyone know how I can programatically locate images in a powerpoint presentation? I am trying to write a program that saves all the images that are pasted into a presentation as seperate files (I dont care about the file names of the images... I just need the binary image data) Jon Have your software save the presentation as an HTML file, then delete any non-picture format files from the HTML folder.  SignatureBill Dilworth A proud member of the Microsoft PPT MVP Team Users helping fellow users. http://billdilworth.mvps.org -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ vestprog2@ Please read the PowerPoint FAQ pages. yahoo. They answer most of our questions. com www.pptfaq.com . > Hi ... Does anyone know how I can programatically locate images in a > powerpoint presentation? I am trying to write a program that saves all [quoted text clipped - 3 lines] > > Jon Thanks... that's a good way to do it... Do you know if there is anyway to do it with out converting the document? Can I locate the image in the stream by parsing the compound document format headers etc? Thanks Jon In 2007, you will be able to, but the internal file structures in previous versions is not published. SignatureBill Dilworth A proud member of the Microsoft PPT MVP Team Users helping fellow users. http://billdilworth.mvps.org -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ vestprog2@ Please read the PowerPoint FAQ pages. yahoo. They answer most of our questions. com www.pptfaq.com . > Thanks... that's a good way to do it... > [quoted text clipped - 4 lines] > Thanks > Jon Thats because in 2007 they are in XML correct? I have a parser that knows how to parse Compound Document Files and spit out the directory streams. Parsing ppt documents I get a directoy stream called "Pictures". I just dont know what format PPT is saving those images in... Can you help? Jon > Thats because in 2007 they are in XML correct? > > I have a parser that knows how to parse Compound Document Files and > spit out the directory streams. Parsing ppt documents I get a directoy > stream called "Pictures". I just dont know what format PPT is saving > those images in... Can you help? Images might be held internally as PNG, JPG or GIF ----------------------------------------- Steve Rindsberg, PPT MVP PPT FAQ: www.pptfaq.com PPTools: www.pptools.com ================================================ Great... that answers the question... I do see JFIF headers in the stream so this this consistent with what I see. What is the other data in the Pictures stream? Also, does this imply that PPT stores the images in the format that they were introduced into the PPT presentation as with no conversion? Jon. > Great... that answers the question... I do see JFIF headers in the > stream so this this consistent with what I see. What is the other data > in the Pictures stream? Beats me. MS doesn't document the file format and there's probably something in the EULA to discourange you from trying to reverse-engineer it. But what fun would that be? ;-) >Also, does this imply that PPT stores the > images in the format that they were introduced into the PPT > presentation as with no conversion? It stores graphics as PNG, JPG or GIF. As near as I can tell, JPGs stay JPGs, GIFs if animated stay GIF, everything else becomes PNG. Oddballs like EPS would need to be retained as-is. There may be other exceptions, but that pretty much covers the basics. Save the presentation as HTML and look at the folder full of supporting files; that's pretty much a mirror of the graphics in the PPT file. ----------------------------------------- Steve Rindsberg, PPT MVP PPT FAQ: www.pptfaq.com PPTools: www.pptools.com ================================================ Thanks Steve! Do you by any chance know the compression they use on the other streams like the PowerPointDocument stream? > Thanks Steve! > > Do you by any chance know the compression they use on the other streams > like the PowerPointDocument stream? Afraid not. In 2007, it all gets simpler. ----------------------------------------- Steve Rindsberg, PPT MVP PPT FAQ: www.pptfaq.com PPTools: www.pptools.com ================================================ |
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