http://www.adobe.com/devnet/pdf/pdf_reference.html
Bottom Link (dated Jun 2008) is what you need. Andrey -----Ursprüngliche Nachricht----- Von: Hesham G. [mailto:[email protected]] Gesendet: Donnerstag, 16. Juni 2011 20:09 An: [email protected] Betreff: Re: Is there a difference between Watermark & Stamp ? Adam , Thanks a lot for the nice tips. I really would like to start learning how to read PDF code to trace it. I have searched for any books or tutorials explaining that, but I couldn't find any. Best regards , Hesham --------------------------------------------- Included message : > I downloaded your file and uncompressed it using pdftk. After that I just > opened it with a text editor and looked for anything which might be > interesting. > > I found that there's an element which mentions something about an image > and transparency. > 2 0 obj > << > /Rotate 0 > /pdftk_PageNum 1 > /CropBox [0 0 612 792] > /MediaBox [0 0 612 792] > /Resources > << > /ExtGState > << > /GS8 21 0 R > /GS5 22 0 R > >> > /Font > << > /F1 23 0 R > >> > /ProcSet [/PDF /Text /ImageB /ImageC /ImageI] > >> > /Parent 1 0 R > /Contents [24 0 R 25 0 R 26 0 R 27 0 R 28 0 R 29 0 R 30 0 R 31 0 > R] > /StructParents 0 > /Type /Page > /Group > << > /CS /DeviceRGB > /Type /Group > /S /Transparency > >> > /Tabs /S >>> > endobj > > Tracing back, it turns out that this is the page element ("20 0" is the > root, "1 0" is the element which defines the pages, and "2 0" is page 1). > Now the /Contents of the page are what we're interested in, but > unfortunately they are all streams of data which means very little to me. > I'm not sure if these are object streams, but I'd imagine so because there > doesn't seem to be any indication of the type. If you can find a way to > get these in a more human-readable format, you should be able to continue > reverse engineering the PDF to determine how the image is on there. Once > you know that, you'll know exactly what you want to do. Then it should > just be a matter of checking the PDF reference to fully understand what's > going on and what output you need from PDFBox. It's important you get > comfortable with tracing through a PDF in a text editor; this is the only > way you'll be able to track down issues. > > I usually just search the PDF source for the keyword that I'm looking for > when I'm looking for a new feature and then trace the code back to try to > understand how it is used and what the key classes are. Once I know what > classes to use, I hit the documentation and search the Internet for > examples. If that doesn't work, check the user mailing list and see if > anyone has any suggestions. If not, check the dev mailing list to see if > the functionality currently exists and if not, if anyone has any > suggestions on where you should implement it. > > ---- > Thanks, > Adam > > > > > > From: > "Hesham G." <[email protected]> > To: > <[email protected]> > Date: > 06/16/2011 07:34 > Subject: > Re: Is there a difference between Watermark & Stamp ? > > > > Adam , > > This post is old, but I am still facing problems using the watermark, and > I need it badly. > > I have created a Microsoft word doc file with a watermark and I saved it > as a PDF file, and it appears just as I want. Now I am looking for a way > for how to do this with PDFBox. You can check this 1 page sample PDF : > http://www.4shared.com/document/rQ2berMh/pdf_with_watermark.html > > Any help would be appreciated. > > > Best regards , > Hesham > > --------------------------------------------- > Included message : > >> Sorry, but I can't give you any code examples for I have never done any >> work with stamps nor watermarks. All I did was read the manual because >> when I saw your question I thought "Hmm, that's a good question!" >> >> What you describe sounds correct in terms of how it works, but it looks >> like there is also an option to have the watermark not appear at all on >> the PDF (when rendered on the screen), but appear when it is printed. > I'm >> not sure if that's something you are interested in, but it's an option > as >> far as I can tell. >> >> Your best bet would be to find a PDF with a watermark, then extract a >> single page. This will give you a small PDF with a watermark and you >> should be able to go through it by hand (i.e. a good text editor). Just > >> search for "watermark" and see what comes up and then when you find >> something in the PDF, see what references it and check the spec to get >> some more information about what you're looking at. For example, if you > >> see object "72 0" is a watermark, search for things which reference 72 > 0. >> If you keep doing this you'll eventually get back to the root. If you >> keep notes, you should have a nice map of how everything is connected. >> I've done this for other objects and in combination with the spec, it's >> worked out pretty well. Remember, you can also make modifications to > the >> PDF using a text editor to see what it does (just remember to back up > the >> original before you go hacking up the PDF or you'll probably end up with > a >> corrupt document). >> >> ---- >> Thanks, >> Adam >> >> >> >> From: >> "Hesham G." <[email protected]> >> To: >> <[email protected]> >> Date: >> 11/11/2010 03:15 >> Subject: >> Re: Is there a difference between Watermark & Stamp ? >> >> >> >> Adam , >> >> Thanks a lot for you reply, and sorry for being that late ... You're >> always >> here Adam when I need an answer. >> >> I have this in PDF reference 1.7, but I do not understand that Adobe > code >> :) >> If you can translate this to me or give me a PDFBox code example, that >> will >> be very helpful. >> >> In general, what I understand is that both watermarks and stamps both > can >> be >> images that appear in the PDF, but a watermark will appear in the >> background, so if there was a text above it, the text will appear >> normally. >> In addition a watermark will appear as a part of the page, so it can't > be >> clicked to show a notice box, as happens in a Stamp. >> >> If this is wrong I hope you can correct me. if it's right, then > watermarks >> >> is what I am looking for. >> >> Best regards , >> Hesham >> >> --------------------------------------------- >> Included message : >> >>> Hesham, >>> >>> Take a look at table 102 in section 8.11.4.4 (Usage and Usage >> Application >>> Dictionaries) of the PDF spec (I'm looking at version 1.7). >>> "A dictionary specifying that the content in this group is shall be > used >>> when printing. It may contain the following optional entries: >>> Subtype A name object specifying the kind of content controlled by the >>> group; for example, Trapping, PrintersMarks and Watermark. >>> PrintState A name that shall be either ON or OFF, indicating that the >>> group shall be set to that state when the document is printed from a >>> conforming reader." >>> >>> For more information on the subtypes, see section 12.5.6.1, and >> 12.5.6.22 >>> for specific details about a watermark. >>> >>> I didn't read all the sections I just references, but after a quick >> look, >>> it seems the main difference is that watermarks only appear on printed >>> documents, where images would appear when viewing the document as well. >>> PDFBox might already support watermarks, but if it doesn't it could >>> probably be added without too much difficulty. Section 12.5.6.22 has a >>> nice example of how it's laid out in the PDF which you could reference. >>> You could also use that to either verify that your test document >> actually >>> has a real watermark, or to manually add a watermark to one of your > test >>> documents. >>> >>> ---- >>> Thanks, >>> Adam >>> >>> >>> ----- Forwarded by Adam Nichols/UR/CER/XLDynamics on 11/09/2010 12:04 >>> ----- >>> >>> From: >>> Adam Nichols/UR/CER/XLDynamics >>> To: >>> [email protected] >>> Cc: >>> "pdfbox-send-question" <[email protected]> >>> Date: >>> 11/08/2010 09:13 >>> Subject: >>> Re: Is there a difference between Watermark & Stamp ? >>> >>> >>> Take a look at table 102 in section 8.11.4.4 (Usage and Usage >> Application >>> Dictionaries) of the PDF spec (I'm looking at version 1.7). >>> "A dictionary specifying that the content in this group is shall be > used >>> when printing. It may contain the following optional entries: >>> Subtype A name object specifying the kind of content controlled by the >>> group; for example, Trapping, PrintersMarks and Watermark. >>> PrintState A name that shall be either ON or OFF, indicating that the >>> group shall be set to that state when the document is printed from a >>> conforming reader." >>> >>> For more information on the subtypes, see section 12.5.6.1, and >> 12.5.6.22 >>> for specific details about a watermark. >>> >>> I didn't read all the sections I just references, but after a quick >> look, >>> it seems the main difference is that watermarks only appear on printed >>> documents, where images would appear when viewing the document as well. >>> PDFBox might already support watermarks, but if it doesn't it could >>> probably be added without too much difficulty. Section 12.5.6.22 has a >>> nice example of how it's laid out in the PDF which you could reference. >>> You could also use that to either verify that your test document >> actually >>> has a real watermark, or to manually add a watermark to one of your > test >>> documents. >>> >>> ---- >>> Thanks, >>> Adam >>> >>> >>> >>> From: >>> "Hesham G." <[email protected]> >>> To: >>> "pdfbox-send-question" <[email protected]> >>> Date: >>> 11/07/2010 00:53 >>> Subject: >>> Is there a difference between Watermark & Stamp ? >>> >>> >>> >>> Hello everyone , >>> >>> What is the difference between a watermark and a stamp in PDF ? >>> I have seen nice examples in PDFBox to create stamps, but none to > create >>> watermarks. I guess it is not supported yet ! >>> >>> >>> Best regards , >>> Hesham >>> >>> >>> >>> >>> >>> - FHA 203b; 203k; HECM; VA; USDA; Conventional >>> - Warehouse Lines; FHA-Authorized Originators >>> - Lending and Servicing in over 45 States >>> www.swmc.com - www.simplehecmcalculator.com >>> Visit www.swmc.com/resources for helpful links on Training, > Webinars, >> >>> Lender Alerts and Submitting Conditions >>> >>> This email and any content within or attached hereto from Sun West >>> Mortgage Company, Inc. is confidential and/or legally privileged. The >>> information is intended only for the use of the individual or entity >> named >>> on this email. If you are not the intended recipient, you are hereby >>> notified that any disclosure, copying, distribution or taking any > action >> >>> in reliance on the contents of this email information is strictly >>> prohibited, and that the documents should be returned to this office >>> immediately by email. Receipt by anyone other than the intended >> recipient >>> is not a waiver of any privilege. Please do not include your social >>> security number, account number, or any other personal or financial >>> information in the content of the email. Should you have any questions, > >>> please call (800) 453 7884. = >> >> >> >> >> >> >> - FHA 203b; 203k; HECM; VA; USDA; Conventional >> - Warehouse Lines; FHA-Authorized Originators >> - Lending and Servicing in over 45 States >> www.swmc.com - www.simplehecmcalculator.com >> Visit www.swmc.com/resources for helpful links on Training, Webinars, > Lender Alerts and Submitting Conditions >> >> This email and any content within or attached hereto from Sun West > Mortgage Company, Inc. is confidential and/or legally privileged. The > information is intended only for the use of the individual or entity named > on this email. If you are not the intended recipient, you are hereby > notified that any disclosure, copying, distribution or taking any action > in reliance on the contents of this email information is strictly > prohibited, and that the documents should be returned to this office > immediately by email. Receipt by anyone other than the intended recipient > is not a waiver of any privilege. Please do not include your social > security number, account number, or any other personal or financial > information in the content of the email. Should you have any questions, > please call (800) 453 7884. = > > > - FHA 203b; 203k; HECM; VA; USDA; Conventional > - Warehouse Lines; FHA-Authorized Originators > - Lending and Servicing in over 45 States > www.swmc.com - www.simplehecmcalculator.com Visit > www.swmc.com/resources for helpful links on Training, Webinars, Lender > Alerts and Submitting Conditions > This email and any content within or attached hereto from Sun West > Mortgage Company, Inc. is confidential and/or legally privileged. The > information is intended only for the use of the individual or entity named > on this email. If you are not the intended recipient, you are hereby > notified that any disclosure, copying, distribution or taking any action > in reliance on the contents of this email information is strictly > prohibited, and that the documents should be returned to this office > immediately by email. Receipt by anyone other than the intended recipient > is not a waiver of any privilege. Please do not include your social > security number, account number, or any other personal or financial > information in the content of the email. Should you have any questions, > please call (800) 453 7884.
