Skip to end of metadata
Go to start of metadata

You are viewing an old version of this page. View the current version.

Compare with Current View Page History

« Previous Version 31 Current »

Installing OpenJPEG on Windows 1X, Linux, and MacOS

OpenJPEG is an open-source JPEG 2000 codec written in C. There is no GUI. This command-line tool is easy to run and maintain using a command-line friendly OS like Linux, so I recommend installing Linux on your Windows 10 machine, taking advantage of W10's Windows Subsystem for Linux feature.

Below are instructions for compiling OpenJPEG, ImageMagick, and GrokImageCompression from source code.

While it is easier to install OpenJPEG and ImageMagick via pre-compiled versions using apt, I've had issues with prior installations that I resolved by compiling the source code, so that is what I recommend. Note that you do not need to install ImageMagick at all, but it is a very useful utility.

If you'd like to try installing OpenJPEG via the precompiled version first, the following command should do the trick:

sudo apt install libopenjp2-7 libopenjp2-tools

Why install GrokImageCompression?

The original JPEG 2000 standard only accommodated three color encoding declarations: sGray, sYCC, and sRGB. As color management gained popularity and a wider variety of ICC display profiles were being embedded in images, the standard was amended in 2004 to accommodate the use of restricted ICC profiles. Those changes are incorporated into ISO/IEC 15444-1:2016 Information technology — JPEG 2000 image coding system: Core coding system — Part 1, the 2016 update to the standard.

As of the openjp2 library v2.3.1., OpenJPEG does not carry over the ICC display profiles embedded within the source image, but instead converts any color encoding to sRGB on output.

GrokImageCompression is an open-source JP2 encoder based on the OpenJPEG code that produces JP2 images encoded with the same colorspace -- includes the same ICC display profile -- resident in the source image.

Want to run Grok Image Compression on a Mac?

It can be installed via Homebrew with the command: brew install grokj2k

1. Install Ubuntu 20.04 LTS

From the Windows App Store, download Ubuntu.

Follow Microsoft's installation instructions.

  • Update the installation by running the following command: sudo apt-get update ; sudo apt-get upgrade -y

  • Install some additional software modules: sudo apt-get install pkg-config valgrind emacs-nox libltdl-dev libtiff-tools exiftool git git-lfs cmake liblcms2-dev libtiff-dev libpng-dev libheif1 libheif-dev libz-dev unzip libzstd-dev libwebp-dev build-essential hwinfo ; sudo python get-pip.py ; sudo apt-get install python3-jpylyzer.

2. Install OpenJPEG by compiling the source code:

  • mkdir ~/install
  • cd ~/install
  • Download the source code: wget https://github.com/uclouvain/openjpeg/archive/master.zip

Follow the installation instructions, per OpenJPEG installation.

  • unzip master.zip
  • cd openjpeg-master/
  • mkdir build
  • cd build
  • cmake -DCMAKE_BUILD_TYPE=Release ..
  • make
  • sudo make install
  • sudo make clean

3. Install ImageMagick from source code:

Follow the ImageMagick installation instructions

  • cd ~/install
  • rm master.zip
  • wget https://github.com/ImageMagick/ImageMagick/archive/refs/heads/main.zip
  • unzip main.zip
  • cd ImageMagick-main

Make sure system sees the libopenjp2.pc file just created by config. To look for the libopenjp2.pc files: find ~ -type f | grep libopenjp2.pc

  • sudo pkg-config PKG_CONFIG_PATH=~/install/openjpeg-master/build
  • ./configure --enable-shared
  • sudo make
  • sudo make install
  • sudo make clean

4. Install GrokImageCompression

The process of compiling Grok is so fussy that, as of March 2023, we recommend:

  1. Install Homebrew on your Linux instance
  2. Install grokj2k with: brew install grokj2k

5. Test your installation

  • mkdir ~/images
  • cd ~/images
  • wget -O in.tif https://storage.googleapis.com/linked_content/icc/ICC_profile_test_image_Farbkreis_120grad.tif

Run the following commands:

  • sudo ldconfig

Testing ImageMagick installation

  • convert in.tif out_via_imagemagick.jp2 | exiftool out_via_imagemagick.jp2 | less

Testing OpenJPEG installation (lossy compression example)

  • opj_compress -i in.tif -o out_lossy_42db.jp2 -p RLCP -t 1024,1024 -EPH -SOP -I -q 42

Testing GrokImageCompression installation (lossy compression example)

  • grk_compress -i in.tif -o grk_out_lossy_42db.jp2 -p RLCP -t 1024,1024 -EPH -SOP -I -q 42

Are the JP2 files you created standard-compliant?

  • jpylyzer *.jp2 | grep '<isValid format="jp2">True</isValid>'

Encoding JP2 files

  • Command: opj_compress and grk_compress

  • Switches:

    • -i <inputFile.ext>
    • -p RLCP (progression order)
    • -t 1024,1024 (tile size)
    • -EPH (End of Packet Header marker)
    • -SOP (Start of Packet)
    • -ImgDir <image dir> (cannot be used with -i switch)
    • -OutFor <ext> (extension for output files)
    • -o <outputFile.ext>
    • -I (specifies lossy encoding)
    • -q <quality in db>
    • -r <compression ratio>
    • -OutFor [J2K|J2C|JP2]

    Output format used to compress the images read from the directory specified with-ImgDir. Required when-ImgDiroption is used. Supported formats areJ2K,J2C, andJP2.

    • -InFor [pbm|pgm|ppm|pnm|pam|pgx|png|bmp|tif|raw|rawl|jpg]

    Input format. Will override file tag.

Selected Grok-specific switches

(See: Options for complete list)

  • -logfile [output file name]

Log to file. File name will be set tooutput file name

  • -num_threads [number of threads]

Number of threads used for T1 compression. Default is total number of logical cores.

  • -Comment [comment]

Add <comment> in comment marker segment(s). Multiple comments (up to a total of 256) can be specified, separated by the | character. For example: -C "This is my first comment|This is my second will store This is my first comment in the first comment marker segment, and This is my second in a second comment marker.

  • -Q, -CaptureRes [capture resolution X,capture resolution Y]

Capture resolution in pixels/metre, in double precision.

  • If the input image has a resolution stored in its header, then this resolution will be set as the capture resolution, by default.
  • If the-Q command line parameter is set, then it will override the resolution stored in the input image, if present.
  • The special values [0,0] for -Q will force the encoder to not store capture resolution, even if present in input image.

Lossless example

  • opj_compress -i in.tif -o out_lossless.jp2 -p RLCP -t 1024,1024 -EPH -SOP

  • grk_compress -i in.tif -o grk_out_lossless.jp2 -p RLCP -t 1024,1024 -EPH -SOP

Lossy example

  • opj_compress -i in.tif -o out_lossy_42db.jp2 -p RLCP -t 1024,1024 -EPH -SOP -I -q 42
  • opj_compress -i in.tif -o out_lossy_r10.jp2 -p RLCP -t 1024,1024 -EPH -SOP -r 10
  • grk_compress -i in.tif -o grk_out_lossy_42db.jp2 -p RLCP -t 1024,1024 -EPH -SOP -I -q 42
  • grk_compress -i in.tif -o grk_out_lossy_r10.jp2 -p RLCP -t 1024,1024 -EPH -SOP -r 10

Decompress: converting JP2 files to other formats

  • opj_decompress -i infile.j2k -o outfile.png

  • opj_decompress -ImgDir images/ -OutFor tif

  • grk_decompress -i infile.j2k -o outfile.png

  • grk_decompress -ImgDir images/ -OutFor tif

—

Encoding entire directories

  • opj_compress -OutFor jp2 -ImgDir /images/in -p RLCP -t 1024,1024 -EPH -SOP -OutDir /images/out

  • grk_compress -out_fmt jp2 -batch_src /images/in -p RLCP -t 1024,1024 -EPH -SOP -out_dir /images/out

Shell scripts

Lossless compression

#!/bin/bash
# Grok Image Compression JP2 JPEG2000 codec encoder lossless compression
# https://github.com/GrokImageCompression/grok
find . -type f | grep --extended-regexp ".*\.tif$" | sed -E "s/.tif//g" > tiffNameStem.txt
ls -1 *.tif | wc -l | xargs echo "TIFF count: "
while read line
do
    grk_compress -i $line".tif" -o $line"_lossless.jp2" -p RLCP -t 1024,1024 -EPH -SOP
    echo "converting "$line".tif"
done < tiffNameStem.txt
echo "
     ~~~ FIN ~~~
"
ls -1 *.jp2 | wc -l | xargs echo "JP2 count: "

Lossy compression

#!/bin/bash
#Grok Image Compression JP2 JPEG2000 codec encoder lossy compression
#https://github.com/GrokImageCompression/grok
find . -type f | grep --extended-regexp ".*\.tif$" | sed -E "s/.tif//g" > tiffNameStem.txt
ls -1 *.tif | wc -l | xargs echo "TIFF count: "
while read line
do
    grk_compress -i $line".tif" -o $line"_lossy.jp2" -p RLCP -t 1024,1024 -EPH -SOP -I -q 42
    echo "converting "$line".tif"
done < tiffNameStem.txt
echo "
     ~~~ FIN ~~~
"
ls -1 *.jp2 | wc -l | xargs echo "JP2 count: "

end

  • No labels

Copyright © 2024 The President and Fellows of Harvard College * Accessibility * Support * Request Access * Terms of Use