- now Python3 only
- pep8 compliant code
- update my email to josch@mister-muffin.de
- move from github to gitlab.mister-muffin.de/josch/img2pdf
- use logging module
- add extensive test suite
- ability to read from standard input
- pdf writer:
- make more compatible with the interface of pdfrw module
- print floats which equal to their integer conversion as integer
- do not print trailing zeroes for floating point numbers
- print more linebreaks
- add binary string at beginning of PDF to indicate that the PDF
contains binary data
- handle datetime and unicode strings by using utf-16-be encoding
- new options (see --help for more details):
- --without-pdfrw
- --imgsize
- --border
- --fit
- --auto-orient
- --viewer-panes
- --viewer-initial-page
- --viewer-magnification
- --viewer-page-layout
- --viewer-fit-window
- --viewer-center-window
- --viewer-fullscreen
- remove short command line options for metadata arguments
Losslessly convert images to PDF without unnecessarily re-encoding JPEG and
JPEG2000 files. Image quality is retained without unnecessarily increasing
file size.
Losslessly convert raster images to PDF. The file size will not unnecessarily
increase. One major application would be a number of scans made in JPEG format
which should now become part of a single PDF document. Existing solutions
would either re-encode the input JPEG files (leading to quality loss) or store
them in the zip/flate format which results into the PDF becoming unnecessarily
large in terms of its file size.
Background
----------
Quality loss can be avoided when converting JPEG and JPEG2000 images to
PDF by embedding them without re-encoding. I wrote this piece of python code.
because I was missing a tool to do this automatically.
Quality loss can be avoided when converting JPEG and JPEG2000 images to PDF by
embedding them without re-encoding. I wrote this piece of python code.
because I was missing a tool to do this automatically. Img2pdf basically just
wraps JPEG images into the PDF container as they are.
If you know how to embed JPEG and JPEG2000 images into a PDF container without
recompression, using existing tools, please contact me so that I can put this
code into the garbage bin :D
If you know an existing tool which allows one to embed JPEG and JPEG2000 images
into a PDF container without recompression, please contact me so that I can put
this code into the garbage bin.
Functionality
-------------
This program will take a list of images and produce a PDF file with the images
embedded in it. JPEG and JPEG2000 images will be included without
recompression. Images in other formats will be included with zip/flate
recompression. Raster images in other formats will be included with zip/flate
encoding which usually leads to an increase in the resulting size because
formats like png compress better than PDF which just zip/flate compresses the
RGB data. As a result, this tool is able to losslessly wrap images into a PDF
container with a quality-filesize ratio that is typically better (in case of
container with a quality to filesize ratio that is typically better (in case of
JPEG and JPEG2000 images) or equal (in case of other formats) than that of
existing tools.
@ -50,75 +54,26 @@ than the input JPEG or JPEG2000 file.
img2pdf is able to losslessly embed JPEG and JPEG2000 files into a PDF
container without additional overhead (aside from the PDF structure itself),
save other graphics formats using lossless zip compression,
and produce multi-page PDF files when more than one input image is given.
Also, since JPEG and JPEG2000 images are not reencoded, conversion with
img2pdf is several times faster than with other tools.
save other graphics formats using lossless zip compression, and produce
multi-page PDF files when more than one input image is given.
Also, since JPEG and JPEG2000 images are not reencoded, conversion with img2pdf
is several times faster than with other tools.
Usage
-----
#### General Notes
The images must be provided as files because img2pdf needs to seek
in the file descriptor. Input cannot be piped through stdin.
The images must be provided as files because img2pdf needs to seek in the file
descriptor.
If no output file is specified with the `-o`/`--output` option,
output will be to stdout.
If no output file is specified with the `-o`/`--output` option, output will be
done to stdout.
Descriptions of the options should be self explanatory.
They are available by running:
The detailed documentation can be accessed by running:
img2pdf --help
#### Controlling Page Size
The PDF page size can be manipulated. By default, the image will be sized "into" the given dimensions with the aspect ratio retained. For instance, to size an image into a page that is at most 500pt x 500pt, use:
img2pdf -s 500x500 -o output.pdf input.jpg
To "fill" out a page that is at least 500pt x 500pt, follow the dimensions with a `^`:
img2pdf -s 500x500^ -o output.pdf input.jpg
To output pages that are exactly 500pt x 500pt, follow the dimensions with an `!`:
img2pdf -s 500x500\! -o output.pdf input.jpg
Notice that the default unit is points. Units may be also be specified and mixed:
img2pdf -s 8.5inx27.94cm -o output.pdf input.jpg
If either width or height is omitted, the other will be calculated
to preserve aspect ratio.
img2pdf -s x280mm -o output1.pdf input.jpg
img2pdf -s 280mmx -o output2.pdf input.jpg
Some standard page sizes are recognized:
img2pdf -s letter -o output1.pdf input.jpg
img2pdf -s a4 -o output2.pdf input.jpg
#### Colorspace
Currently, the colorspace must be forced for JPEG 2000 images that are
not in the RGB colorspace. Available colorspace options are based on
Python Imaging Library (PIL) short handles.
* `RGB` = RGB color
* `L` = Grayscale
* `1` = Black and white (internally converted to grayscale)
* `CMYK` = CMYK color
* `CMYK;I` = CMYK color with inversion
For example, to encode a grayscale JPEG2000 image, use:
img2pdf -C L -o output.pdf input.jp2
Bugs
----
@ -135,20 +90,17 @@ outperformed by another lossless compression method, contact me.
I have not yet figured out how to determine the colorspace of JPEG2000 files.
Therefore JPEG2000 files use DeviceRGB by default. For JPEG2000 files with
other colorspaces, you must force it using the `--colorspace` option.
other colorspaces, you must explicitly specify it using the `--colorspace`
option.
It might be possible to store transparency using masks but it is not clear
what the utility of such a functionality would be.
Most vector graphic formats can be losslessly turned into PDF (minus some of
the features unsupported by PDF) but img2pdf will currently turn vector
graphics into their lossy raster representations.
Acrobat is able to store a hint for the PDF reader of how to present the PDF
when opening it. Things like automatic fullscreen or the zoom level can be
configured.
It would be nice if a single input image could be read from standard input.
graphics into their lossy raster representations. For converting raster
graphics to PDF, use another tool like inkscape and then join the resulting
pages with a tool like pdftk.
A configuration file could be used for default options.
@ -158,10 +110,6 @@ Installation
On a Debian- and Ubuntu-based systems, dependencies may be installed
josch
