Hello Gabriel, I have some answers concerning the DJVU system. 1) Simplicity of the support ? Since I am not a computer programmer myself, I can't really assess the burden of supporting DJVU files in Pdfmod. But, I have discovered that all OS seem fully compatible with djvu files. The library called DJVUlibre enables page sorting, table of contents editing and so on (cf ubuntu & djvulibre manuals). Provided you are able to make some programming you can make plenty of changes. And there is a dedicated reader called DJView4 which is really efficient. 2) Identity of the UI ? There seem to be no difference between pdf and djvu apart from the compressing efficiency. When I use pdf2djvu (an ubuntu converting command) I get the exact same file, only smaller. (The table of content is the same. The structure is the same). I compared the commands pdfmod-djvulibre. They seem equivalent : Extract page>djvused - save-page - save-page-with Rotate page> djvudigital --psrotate (MAYBE, I didn't try it) Export image>ddjvu Bookmarks>djvused - set-page-title - print-outline - set-outline Page sorting>djvused Save>djvused - save 3) Usefulness vs maintenance-burden tradeoff ? As far as I can tell Djvu files are much lighter and much faster to use than pdf. I recently used a pocketbook 602 ebook reader. Large djvu files were working just fine whereas the same pdf files weren't. As you noticed yourself, PDF files are the dominant standard. They are fully efficient thanks to the Adobe Creative Suite. Which accounts for the amount of pdf available. All the more as they got officially released as an open standard on July 1, 2008 (cf references). But I found this paragraph on Mobileread (an ebook-dedicated forum) : "It would be great to have a completely free solution that avoids Acrobat, but I've not seen one yet. The pdf's produced by djvu2pdf are ~10X larger than the original DjVu file, and I've only seen Acrobat's optimization able to get them down below the original file size. This is a significant issue for any size library." This paragraph stresses the fact that you can't create lighweight pdf without using Adobe products. And I found plenty of other messages alike. On the other hand, People are avoiding djvu because of it's lack of editing efficiency. What if they could use the djvu files "lightweightness" in the same manner as they use pdf files? What DJVU files need is a program that would be able to edit DJVU files in an user-friendly manner. And since you've made such a great job for pdf, I've decided to contact you... Regards, Olivier NB: I added three examples of the same file : pdf, djvu and toc structure for of the djvu. References : wikipedia : http://en.wikipedia.org/wiki/Djvu DJVU libre : http://djvu.sourceforge.net/ The Ubuntu manpage : http://manpages.ubuntu.com/manpages/karmic/en/man1/djvu.1.html mobileread : http://www.mobileread.com/ iso standard for pdf : http://www.iso.org/iso/catalogue_detail.htm?csnumber=51502 On Wed, 18 May 2011 15:48:11 +0200 Gabriel Burt <gabriel burt gmail com> wrote: >Hi Olivier, > >I'd be open to adding support for other formats if 1) that support >was >*simple* - leveraging an existing library, and equivalent or less >code >than our PDF support 2) feature complete with our PDF support, so >that in the UI it would appear identical to now. A third factor >would >be the usefulness-to-users vs maintenance-burden tradeoff; if very >few >people use it, I'm not sure it would be worth it. > >Gabriel > >On Thu, May 12, 2011 at 6:45 AM, <birblu hush com> wrote: >> Greetings, pdfmod users and developpers >> >> My name is olivier. I use pdfmod regularly. It's a great tool for >> pdf editing. I thank you for making such a great program >available. >> >> My problem is that pdf files are rather inefficient. I use old >> computers and pdfs tend to take time to load or search. So, I've >> been looking for alternative. I discovered djvu files. In >> comparison, djvus are much lighter and faster than pdfs. They are >> also much more efficient when it comes to ebook readers. >> >> But there are drawbacks for djvu as well. Though the licence is >> opensource (gpl), there are very few programs for djvu editing >out >> there. I can't edit the toc for a djvu under gnome without the >> terminal. >> >> So my question is : Would it be possible, either to make a gnome >> djvu program equivalent to pdfmod or implement the same "table of >> contents" editing interface for djvu files ? >> >> I am not a computer programmer myself. So I can't assess the >> importance of such a project. But the librairies seem to be >> available. They are called djvulibre. There is also a dedicated >> website : >> http://djvu.sourceforge.net/ >> >> Regards >> Olivier. >> >> _______________________________________________ >> pdfmod-list mailing list >> pdfmod-list gnome org >> http://mail.gnome.org/mailman/listinfo/pdfmod-list (unsubscribe >here) >> >_______________________________________________ >pdfmod-list mailing list >pdfmod-list gnome org >http://mail.gnome.org/mailman/listinfo/pdfmod-list (unsubscribe >here)
Attachment:
2010-GUADEC-Banshee_Awesome_Factory.djvu
Description: image/vnd.djvu
Attachment:
2010-GUADEC-Banshee_Awesome_Factory.pdf
Description: Adobe PDF document
(bookmarks
("Introduction"
"#p0001.djvu" )
("Jump In with confidence"
"#p0002.djvu"
("Install dependencies"
"#p0003.djvu" )
("Get the code"
"#p0003.djvu" ) )
("Time to Hack"
"#p0010.djvu" )
("Code commits every week"
"#p0014.djvu"
("10 bugs fixed every week"
"#p0015.djvu" )
("1 new contributor almost every week"
"#p0016.djvu" )
("A few days hundreds"
"#p0017.djvu" ) ) )