exactly, my goal was to remove everything from the pdf except a grid and generate an image of that afterwards. Oddly ( and luckly! ) the grid remain there eventhough LineTo was removed.
regards On Thu, Nov 8, 2012 at 11:34 AM, <[email protected]> wrote: > good to hear. > > i thought you are trying to clone pdf without images. that's why i > suggested to create new content stream. > if you wanted just to convert pdf to image (with the help of PageDrawer) > then your technique is correct. > > btw. you skipped "LineTo" operator which means you skipped all "vector > pictures" and all other lines in pdf. so you are propably removing even > lines you don't want to remove (lines are used to paint tables/cells > borders) > > > Best regards > Juraj Lonc > > > > > From: Zhnupy Gonzalez <[email protected]> > To: [email protected], > Date: 08. 11. 2012 18:05 > Subject: Re: remove all images from pdf > > > > Juraj, > your answer made me put more attention not in streams but in decoders > instead. So I learn there is this class PageDrawer (actually a subclass of > PDFStreamEngine) that ultimately produces image from pdf, so I tried > commenting out a few decoders in PageDrawer.properties until I succeded: > only when I removed org.apache.pdfbox.util.operator.pagedrawer.LineTo the > icons I was looking to skip were gone. > > thanks! > > > On Thu, Nov 8, 2012 at 8:00 AM, <[email protected]> wrote: > > > hi, > > there are several types of pictures. > > > > 1. bitmap images that are stored as resources > > 2. inline bitmap images that are stored within page's content stream > > 3. images that consist of curves/vectors - these vectors are defined > > within page's content stream > > > > your example code removes only images defined in #1 > > if you want to remove images #2 and #3 it is much harder. you need to > > parse content stream, remove them, and create new content stream. > > > > > > Best regards > > Juraj Lonc > > > > > > > > > > From: Zhnupy Gonzalez <[email protected]> > > To: [email protected], > > Date: 08. 11. 2012 14:50 > > Subject: remove all images from pdf > > > > > > > > Hello everyone, > > While looking for a way to remove all images from pdf file, I found > this: > > > > > > http://stackoverflow.com/questions/6831194/how-can-i-remove-all-images-drawings-from-a-pdf-file-and-leave-text-only-in-java > > > > > > > which wasn't enough, so I ended replacing the page's resource object > with > > a > > new (empty) one: > > for (Object pageObj : catalog.getAllPages()) { > > PDPage page = (PDPage) pageObj; > > page.setResources(new PDResources()); > > } > > > > which for my purposes is fine (there are some warnings when opening the > > file with acrobat reader but it doesn't interfere with my goal). > > > > BUT, there are still some images on the document and I don't know how to > > tear them out. I don't even know how to "navigate" to those images, my > > guess is I need to somehow traverse through page.getCOSDictionary() and > > delete appropiate entries but I haven't manage to do that and also not > > sure > > if that works. > > > > any help? > > regards > > > > > >
