Those methods are informative and depend on the information in the image. You still have to scale, based or not in what you get from those methods.
> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On > Behalf Of [EMAIL PROTECTED] > Sent: Tuesday, November 08, 2005 10:01 AM > To: itext-questions@lists.sourceforge.net > Subject: [iText-questions] iText Newbie question: The image resolution > > Hi Everybody, > > I am just a newbie here who is trying to use the iText for > some PDF related functions in my development job. Here I got > some questions about how the iText handle about the image > storage inside the PDF file: > > From the iText tutorial, it mentioned: "Remark that the > resolution of an image that is added without scaling will be > 72dpi by default. If an image is placed with a scaling of 50% > the the resolution will be 144. With lower scalings the > resolution will increase because the pixels are the same but > the size will be smaller. To put a picture with 300dpi use a > scaling of 72/300=24%. For instance: if you have a 5X5 inch > image that you scan at 300 dpi, the resultant image is > 1500X1500 pixels (5X300 = 1500). When you place this image in > the pdf with a scaling of 24% (72/300 = 0.24), the image in > the pdf will be 5X5 inch with 1500X1500 pixel at 300 dpi. The > image will always be 1500X1500 pixel whatever the size. " > > As my understanding, which means the resolution dpi of the > image will only be decided by the original image source data > as well as the size scaling of the display area of that image > in the generated PDF file. > > But I am also wondering how can I adjust the resolution if needed. > Seems the com.lowagie.text.Image class has the Method of > "setDpi()" and also methods for retrieving the dpi info, > which are "getDpiX()" and "getDpiY()"; > > I've write some codes to see how those methods work, which as > following: > > Image jpg = Image.getInstance("test.jpg"); > System.out.println("Original Dpi: > x="+jpg.getDpiX()+" y="+jpg.getDpiY()); > > jpg.setDpi(500,500); > System.out.println("After Setting > Dpi: x="+jpg.getDpiX()+" y="+jpg.getDpiY()); > jpg.scalePercent(50f); > System.out.println("After Scaling > Dpi: x="+jpg.getDpiX()+" y="+jpg.getDpiY()); > > document.open(); > document.add(jpg); > > However, the output result kind of confused me about the > idea. Because it seemed that the "setDpi()" Method will > change the values of "getDpiX()" and "getDpiY()", and the > "scalePercent()" method has nothing to do with the results of > those two methods, besides, no matter what dpi value I set > with the "setDpi()" Method, the generated PDF file size will > be just the same. > > If anybody can give a clear explanation on this issue, that > will be really appreciated! > > Thank you very much! > > > Best, > > Han > [EMAIL PROTECTED] > No. 86-756-3398808 > > > IMPORTANT NOTICE > Email from OOCL is confidential and may be legally > privileged. If it is not intended for you, please delete it > immediately unread. The internet cannot guarantee that this > communication is free of viruses, interception or > interference and anyone who communicates with us by email is > taken to accept the risks in so doing. Without limitation, > OOCL and its affiliates accept no liability whatsoever and > howsoever arising in connection with the use of this email. > Under no circumstances shall this email constitute a binding > agreement to carry or for provision of carriage services by > OOCL, which is subject to the availability of carrier's > equipment and vessels and the terms and conditions of OOCL's > standard bill of lading which is also available at > http://www.oocl.com. > > ------------------------------------------------------- SF.Net email is sponsored by: Tame your development challenges with Apache's Geronimo App Server. Download it for free - -and be entered to win a 42" plasma tv or your very own Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php _______________________________________________ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions
