Remember that the 'P' in JPEG == Photographic. The JPEG algorithm is designed to work on PHOTOGRAPHS and as such will cause "artifacting" on any text or vector data that is compressed using that algorithm. If you are working with images containing "text" and "vector" - do as Paulo suggests - switch to PNG, which doesn't have this problem.
NOTE: if you take that same JPEG and view it in ANY JPEG viewer - you will see the same results. It's NOT a PDF issue. It's a JPEG issue. Leonard On Apr 6, 2008, at 4:00 AM, Paulo Soares wrote: > Jpeg only works well with continous tone images, like photos. Text and > charts have abrupt color changes that create artifacts and look > bad. Use PNG > or GIF for those kind of images. > > Paulo > > ----- Original Message ----- > From: "bisoa" <[EMAIL PROTECTED]> > To: <itext-questions@lists.sourceforge.net> > Sent: Sunday, April 06, 2008 7:06 AM > Subject: Re: [iText-questions] JPEG images become blurry when added > to a > document > > >> >> Of course, I agree that iText passes images as they were given, >> and pdf viewers use them as they are passed. But as the initial >> poster said, there's a quality issue of rendered images in viewers! >> I have to say that this problem can be more easily recognizable in >> statistical charts and fonts drawin in images, than in photo images. >> >> PS: May you and iText team together can better answer than me! >> >> >> >> >> Leonard Rosenthol wrote: >>> >>> On Apr 5, 2008, at 3:14 AM, bisoa wrote: >>>> This is a PDF viewer problem, not doing proper image scaling that >>>> combines >>>> with anti-aliasing. Images in PDF are generally poor. If you apply >>>> higher-definition images, you would expect better quality showing. >>>> This is >>>> not the case with PDF viewers! >>>> >>> >>> EXCUSE ME?!?! >>> >>> PDF viewers use EXACTLY what they are given (if you give high >>> resolution, they will use high resolution - and vice versa) and use >>> that when rendering to the zoom factor(s) as requested. >>> >>> What are you expecting that isn't happening?!?! >>> >>> Leonard Rosenthol >>> Adobe Systems > > > ---------------------------------------------------------------------- > --- > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > Register now and save $200. Hurry, offer ends at 11:59 p.m., > Monday, April 7! Use priority code J8TLD2. > http://ad.doubleclick.net/clk;198757673;13503038;p?http:// > java.sun.com/javaone > _______________________________________________ > iText-questions mailing list > iText-questions@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/itext-questions > > Do you like iText? > Buy the iText book: http://www.1t3xt.com/docs/book.php > Or leave a tip: https://tipit.to/itexttipjar > ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Register now and save $200. Hurry, offer ends at 11:59 p.m., Monday, April 7! Use priority code J8TLD2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Do you like iText? Buy the iText book: http://www.1t3xt.com/docs/book.php Or leave a tip: https://tipit.to/itexttipjar
