PDF2DJVU(1)pdf2djvu manual PDF2DJVU(1)NAMEpdf2djvu - creates DjVu files from PDF files
SYNOPSISpdf2djvu [{-o | --output} output-djvu-file] [option...] pdf-file...
pdf2djvu {-i | --indirect} index-djvu-file [option...] pdf-file...
pdf2djvu {--version | --help | -h}
DESCRIPTION
This program creates a DjVu file from one or more Portable Document
Format files.
OPTIONSpdf2djvu accepts the following options:
Document type, file names
-o, --output=output-djvu-file
Generate a bundled multi-page document. Write the file into
output-djvu-file instead of standard output.
-i, --indirect=index-djvu-file
Generate an indirect multi-page document. Use index-djvu-file as
the index file name; put the component files into the same
directory. The directory must exist and be writable.
--pageid-template=template
Specifies the naming scheme for page identifiers. Consult the
“TEMPLATE LANGUAGE” section for the template language description.
The default template is “p{page:04*}.djvu”.
For portability reasons, page identifiers:
· must consist only of lowercase ASCII letters, digits, _, +, -
and dot,
· cannot start with a +, - or a dot,
· cannot contain two consecutive dots,
· must end with the .djvu or the .djv extension.
--pageid-prefix=prefix
Equivalent to “--pageid-template=prefix{page:04*}.djvu”.
--page-title-template=template
Specifies the template for page titles. Consult the “TEMPLATE
LANGUAGE” section for the template language description.
The default is to set no page titles.
Resolution, page size
-d, --dpi=resolution
Specifies the desired resolution to resolution dots per inch. The
default is 300 dpi. The allowed range is: 72 ≤ resolution ≤ 6000.
--media-box
Use MediaBox to determine page size. CropBox is used by default.
--page-size=widthxheight
Specifies the preferred page size to width pixels × height pixels.
The actual page size may be altered in order to respect aspect
ratio and DjVu limitations on resolution. (This option takes
precedence over -d/--dpi.)
--guess-dpi
Try to guess native resolution by inspecting embedded images. Use
with care.
Image quality
--bg-slices=n+...+n, --bg-slices=n,...,n
Specifies the encoding quality of the IW44 background layer. This
option is similar to the -slice option of c44. Consult the c44(1)
manual page for details. The default is 72+11+10+10.
--bg-subsample=n
Specifies the background subsampling ratio. The default is 3. Valid
values are integers between 1 and 12, inclusive.
--fg-colors=default
Try to preserve all the foreground layer colors. This is the
default.
--fg-colors=web
Reduce foreground layer colors to the web palette (216 colors).
This option is not recommended.
--fg-colors=n
Use GraphicsMagick to reduce number of distinct colors in the
foreground layer to n. Valid values are integers between 1 and
4080. This option is not recommended.
--fg-colors=black
Discard any color information from the foreground layer.
--monochrome
Render pages as monochrome bitmaps. With this option, --bg-... and
--fg-... options are not respected.
--loss-level=n
Specifies the aggressiveness of the lossy compression. The default
is 0 (lossless). Valid values are integers between 0 and 200,
inclusive. This option is similar to the -losslevel option of cjb2;
consult the cjb2(1) manual page for details. This option is
respected only along with the --monochrome option.
--lossy
Synonym for --loss-level=100.
--anti-alias
Enable font and vector anti-aliasing. This option is not
recommended.
Extraction
--no-metadata
Don't extract the metadata.
By default:
· The following entries of the document information dictionary
are extracted: Title, Author, Subject, Creator, Producer,
CreationDate, ModDate. Timestamps are formatted according to
RFC 3999[1], with date and time components separated by a
single space.
· The XMP metadata is extracted (or created) and updated
accordingly.
Note
If multiple input documents are specified, only metadata of the
first one is taken into account.
--verbatim-metadata
Keep the original metadata intact.
--no-outline
Don't extract the document outline.
--hyperlinks=border-avis
Make hyperlink borders always visible.
By default, a hyperlink border is visible only when the mouse is
over the hyperlink.
--hyperlinks=#RRGGBB
Force the specified border color for hyperlinks.
--no-hyperlinks, --hyperlinks=none
Don't extract hyperlinks.
--no-text
Don't extract the text.
--words
Extract the text. Record the location of every word. This is the
default.
--lines
Extract the text. Record the location of every line, rather that
every word.
--crop-text
Extract no text outside the page boundary.
--no-nfkc
Don't NFKC[2]-normalize the text.
--filter-text=command-line
Filter the text through the command-line. The provided filter must
preserve whitespace, control characters and decimal digits.
This option implies --no-nfkc.
-p, --pages=page-range
Specifies pages to convert. page-range is a comma-separated list
of sub-ranges. Each sub-range is either a single page (e.g. 17) or
a contiguous range of pages (e.g. 37-42). Pages are numbered from
1.
The default is to convert all pages.
Performance
-j, --jobs=n
Use n threads to perform conversion. The default is to use one
thread.
-j0, --jobs=0
Determine automatically how many threads to use to perform
conversion.
Verbosity, help
-v, --verbose
Display more informational messages while converting the file.
-q, --quiet
Don't display informational messages while converting the file.
--version
Output version information and exit.
-h, --help
Display help and exit.
ENVIRONMENT
The following environment variables affects pdf2djvu on Unix systems:
OMP_*
Details of runtime behaviour with respect to parallelism can be
controlled by several environment variables. Please refer to the
OpenMP API specification[3] for details.
TMPDIR
pdf2djvu makes heavy use of temporary files. It will store them in
a directory specified by this variable. The default is /tmp.
TEMPLATE LANGUAGE
Template syntax
The template language is roughly modelled on the Python string
formatting syntax[4].
A template is a piece of text which contains fields, surrounded by
curly braces {}. Fields are replaced with appropriately formatted
values when the template is evaluated. Moreover, {{ is replaced with a
single { and }} is replaced with a single }.
Field syntax
Each field consists of a variable name, optionally followed by a shift,
optionally followed by a format specification.
The shift is a signed (i.e. starting with a + or - character) integer.
The format specification consists of a colon, followed by a width
specification.
The width specification is a decimal integer defining the minimum field
width. If not specified, then the field width will be determined by the
content. Preceding the width specification with a zero (0) character
enables zero-padding.
The width specification is optionally followed by an asterisk (*)
character, which increases the minimum field width to the width of the
longest possible content of the variable.
Available variables
page, spage
Page number in the PDF document.
dpage
Page number in the DjVu document.
IMPLEMENTATION DETAILS
Layer separation algorithm
Unless the --monochrome option is on, pdf2djvu uses the following naïve
layer separation algorithm:
1. For each page, do the following:
1. Raster the page into a pixmap, in the usual manner.
2. Raster the page into another pixmap, omitting the following
page elements:
· text,
· 1 bit-per-pixel raster images,
· vector elements (except fills of large areas).
3. Compare both pixmaps, pixel by pixel:
1. If their colors match, classify the pixel as a part of the
background layer.
2. Otherwise, classify the pixel as a part of the foreground
layer.
BUG REPORTS
If you find a bug in pdf2djvu, please report it at the issue
tracker[5].
SEE ALSOdjvu(1), djvudigital(1), csepdjvu(1)AUTHOR
Jakub Wilk <jwilk@jwilk.net>
Author.
NOTES
1. RFC 3999
https://www.ietf.org/rfc/rfc3339
2. NFKC
http://unicode.org/reports/tr15/
3. OpenMP API specification
http://openmp.org/wp/openmp-specifications/
4. Python string formatting syntax
https://docs.python.org/library/string.html#format-string-syntax
5. the issue tracker
https://bitbucket.org/jwilk/pdf2djvu/issues
pdf2djvu 0.7.21 05/09/2015 PDF2DJVU(1)
