As far as I know the JPG format doesn't do alpha layers. You'll have to go with a PNG or GIF for that.
org.apache.pdfbox.pdmodel.graphics.xobject.PDPixelMap mentions "png" in the constructor. And there's a fileSuffix in the constructor for org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectImage where the documentation says "The file suffix, jpg/png." The FlateFilter class also has a bunch of comments which reference PNGs, but I think that class might be used exclusively for decoding images... so that wouldn't help you insert them if that's the case. Good luck ---- Thanks, Adam From: Vinayak <[email protected]> To: [email protected] Date: 09/30/2010 12:31 Subject: Re: Embed PNG/GIF image into existing PDF Document Adam and Thomas, Thanks a lot for your pointers. After searching through the mailing list archives, i came to realize that there are no dedicated class to handle PNG/GIF images with alpha layer like PDJPeg and PDCcitt classes. A suggested work around was to load PNG image into a buffered image using ImageIO. If the loaded image has alpha channel, PDJpeg attempts to do some processing, take a look at the PDJpeg constructor; *PDJpeg< http://www.pdfbox.org/javadoc/org/pdfbox/pdmodel/graphics/xobject/PDJpeg.html#PDJpeg(org.pdfbox.pdmodel.PDDocument , java.awt.image.BufferedImage)>*(PDDocument doc, BufferedImage bi) Going ahead with this approach, if the load image, say a sample user signature file, is in any other color than black, the default handling of alpha transparency in PDJpeg renders the image correctly and the image is embedded as expected. I have an issue as mostly these input images will be inked in black, nothing of the embedded image is visible on the pdf document. After some brain storming I came up with a routine to alter the image using Java2D; public static BufferedImage alterImage(BufferedImage im) { ... // Using LookupOp filter from Java2D api to replace RGB pixels of Color.BLACK // with RGB values (1,1,1). } The altered image is then processed by PDJpeg and input image is displayed correctly in the PDF document. I could not add a white background to the image as the PDF document is not black on white background document. Can you suggest a better approach? I am ready to spend more time to research on this to do it the right way. Adam, the message thread you suggested looks interesting, I will dive deeper into it. Regards, Vinayak On Thu, Sep 30, 2010 at 11:30 PM, Thomas Chojecki <[email protected]>wrote: > Am 30.09.2010 19:35, schrieb Vinayak Mishra: > >> Hi all, >> > Hi > > > Forgive my naiveness but I am new to PdfBox, and trying my best to >> understand the library. I am stuck at a point and need someone to show a >> work around, pls see the mail below for details. >> > > No problem, i think no one have a helping solution, so no one answer you. > > > I mailed this to the list a few days back, and receiving no response feels >> weird. I am not sure if my mails are getting through. >> > > The mailing list works great. If you subscribed the list correctly, you > should also got your mail from the mailing list, as well as the other > subscriber. > > -----Original Message----- >> From: Vinayak >> Sent: 28/09/2010 12:42:24 >> Subject: Re: Embed PNG/GIF image into existing PDF Document >> >> I am loading PNG image using ImageIO and loading into PDJpeg using >>> PDJpeg(PDDocument, BufferedImage). >>> >> > You are trying to load a PNG with the PDJpeg which is only for JPGs. > > Some times ago i used iText for adding images like PNG and JPG in PDF > documents and find out, that ... > - JPGs are stored directly byte-by-byte in the document > - PNGs are stored manipulated, i mean iText do something with the images > befor storing it in the document. > > So i think it would be tricky to implement a similar class for PNGs. > BUT you can convert the images with java on the fly in JPG like i did it > and then store the image with the PDJpeg. If the image is transparent, you > should add a white background color befor storing it. > > > Thank you very much. >>> -- >>> Vinayak >>> >> > regards > > Thomas > ? Click here to submit 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 the taking of 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.
