Asagoth

Djvu to PDF

How do you change Djvu files to PDF? I watched files you put in and some are good but some are illegible so I wanted to ask.--Lukdriver14 (talk) 10:12, 7 May 2020 (EDT)

www.onlineconverter.com--Asagoth (talk) 10:16, 7 May 2020 (EDT)

I broke djvu to jpg and then combined into pdf. The quality was better than the online converter but the files were larger and the process was quite long.--Lukdriver14 (talk) 10:53, 7 May 2020 (EDT)

So... do you want to do it instead? --Asagoth (talk) 11:01, 7 May 2020 (EDT)

I just wanted to say that if the file is very unreadable then you can always use this method.--Lukdriver14 (talk) 11:06, 7 May 2020 (EDT)

I see... I'll give it a try then...--Asagoth (talk) 11:11, 7 May 2020 (EDT)

So what about now?... Does it look good to you?...--Asagoth (talk) 11:28, 7 May 2020 (EDT)

This one looks good and this one does not--Lukdriver14 (talk) 12:20, 7 May 2020 (EDT)

I've done as you said... which tool have you used ?...--Asagoth (talk) 12:31, 7 May 2020 (EDT)

Edit: issue #25 outputs pages with a low resolution of 419x594 ...--Asagoth (talk) 12:43, 7 May 2020 (EDT)

"it's a big faff"

I got some results:

1. Avoid the online converters - they're not fit for purpose.
2. Hunt down the DjVuLibre library
3. Use the ddjvu command line tool to output each page as a TIFF file (http://djvu.sourceforge.net/doc/man/ddjvu.html) (the PDF conversion leads to stupid file sizes - ignore that)
4. Convert pages to JPEG
5. File:JPEGtoPDF.7z

rem Look at me I'm a batch script.

@echo off
rem del *.jpg /Q

rem Extract each page as TIFF files
for /L %%A in (1,1,36) do (
  ddjvu -format=tiff -page=%%A test.djvu test%%A.tif
)

rem Get Imagemagick to convert from TIFF to JPEG.
magick mogrify -format jpg -quality 75 *.tif

rem Delete all the remaining TIFF files
del *.tif /Q

e.g. File:GryKomputerowe PL 06.pdf

I'm sure it can be made more intelligent. -Black Squirrel (talk) 13:02, 7 May 2020 (EDT)