> On 29 Mar 2016, at 07:50, Costas Stergiou <[email protected]> wrote: > > Do you REALLY need that and why? I'm asking because it was such a pain > to get the JPEG stuff working properly. > > Could you upload one file that you created with your code? > > Jpeg2000 has the lossless compression mode and it does really better > compression than jpeg > (http://www.verypdf.com/pdfinfoeditor/jpeg-jpeg-2000-comparison.htm). This is > important for some customers, especially if they are using pdf/a format.
PDF/A is for archiving, and while PDF/A-2 does support JPEG 2000, it's not a good choice for an archival format, because most JPEG 2000 implementations are broken in some way and many PDF viewers cannot correctly view such files. It was essentially a failure as a file format and will be deprecated in PDF 2.0. If the goal of archiving with PDF/A is to produce reliable files, JPEG 2000 conflicts with that goal. > I am attaching a couple of files: a jpg file, and a pdf file where it > contains this jpg file which has been re-encoded as jpeg2000 (lossless) and > included in the pdf file. Re-encoding a lossy JPEG as a lossless JPEG 2000 doesn't make much sense. The loss has already occurred. Wouldn't this just make the file larger? Again, if your goal is to archive these images, prefer not re-encoding them at all. -- John > This pdf file can be opened in xchange pdf viewer but not in adobe. Even in > xchange, the result is not good. > > Thanks > Costas > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected]
