jpegtran is a small library that allows you to transcode JPEG files. Currently supported scale factors are M/N with all M from 1 to 16, where N is the source DCT size, which is 8 for baseline JPEG. If the /N part is omitted, then M specifies the DCT scaled size to be applied on the given input.
For baseline JPEG this is equivalent to M/8 scaling, since the source DCT size for baseline JPEG is 8. CAUTION: An implementation of the JPEG SmartScale extension is required for this feature. SmartScale enabled JPEG is not yet widely implemented, so many decoders will be unable to view a SmartScale extended JPEG file at all.
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Direct commandline call:
$ jpegtran -h
–help Display this help and exit.
–version Display version information and exit.
-outfile filename Output filename.
-overwrite Overwrite output file if it already exists.
-progressive Convert an input JPEG file to progressive JPEG format.
Files that cannot be progressive and do not need to be
transcoded (no -progressive or -perfect options) are
output as non-progressive JPEGs.
-perfect Convert an input JPEG file to progressive JPEG format.
For critical applications such as medical diagnosis,
input JPEG files should be converted to progressive
JPEG format (if not already a progressive JPEG file)
because lossless conversion of progressive JPEG files is
-maxmemory N Set limit for amount of memory to use in processing
large images (inclusive of input file, display mode,
quantization table buffers, and so on).
-outbuf N Specify size of output image buffer.
Jpegtran Free [Updated] 2022
Java version of the software previously known as cjpeg/djpeg, included as part of the IJG JPEG libaries. The main external interfaces in the IJG library are:
jpegtran is a small library that allows you to transcode a single JPEG file. The library is written in C, and is fairly easy to use. It is contained in the zlib, libjpeg, and libjpeg-turbo packages. However, it does not contain its own compression or decompression codec. Instead, it relies on the standard (generally) programming support provided by the zlib, libjpeg, and libjpeg-turbo packages. These packages are installed on your machine if they are not already installed, and these packages typically contain good (and free) programming implementations. See the GNU java package, the zlib package, the libjpeg package, and the libjpeg-turbo package for details.
See for more information about using the library.
First, be sure to use a version of jpegtran that corresponds to the
source file’s version, and with the same software’s “I” suffix.
For example: “jpegtran -progressive” is correct if you are reading a progressive JPEG file generated by a web browser, and “jpegtran -progressive -optimize” is correct if you are reading a progressive JPEG file generated by server application.
Also, be sure that you are working on a file that is completely in the baseline format. If you are reading a JPEG file that is converted from another format, then use the “r” mode (if you have it). For example:
jpegtran -progressive -r -optimize -outfile foo.jpg foo.jpg
Does not compare against nor produce any output files if the original JPEG file is already progressive (if the input file is already progressive, the -r option is not required).
When working with raw Huffman or arithmetic JPEG, and only as part of the IJG library, the following steps are performed on each input file:
1. User calls jpegtran -progressive
2. Library sets compression parameters based on default compression_method. These parameters are also set if the input is a progressive, a nonprogressive, or a traditional “arithmetic” JPEG file.
3. If the input is a progressive JPEG file, the library calls jpeg_start_compress() with all desired options set.
4. The library sets initial_tile_
What’s New In?
jpegtran is a low-level library that can be used as a drop-in replacement for compress/decompress in IJG libjpeg. This document describes the usage of jpegtran and presents the design of the library.
jpegtran [ options ] inputfile outputfile
-optimize inputfile outputfile [none|progressive|arithmetic|baseline] -outfile outputfile
-quality value 0-100 [0-9] -bracket N [0-9] -scaling-factor M/N [0-16] -approxdev RR/SS [0-9] -colorspace grayscale|rgb|CMYK [default=RGB] -progressive
For example, to optimize a JPEG file test.jpg, you can run the following:
jpegtran -optimize test.jpg test_optimized.jpg
The values for the various parameters are explained in the description of the -optimize switch below.
It is possible to set the value of the quality level parameter for each scan of the input file. This allows the user to control the quality of the output image. Set the quality level using
For example, to set the quality level to 70, use
jpegtran -qualitylevel 70 test.jpg test_optimized.jpg
or, short form,
jpegtran -q70 test.jpg test_optimized.jpg
The quality setting is permitted to range from 0 to 100. A quality setting of 0 will produce the least compressed output. A quality setting of 100 will produce the most compressed output. Normally, setting the quality level will produce a somewhat smaller file size than setting the compression mode (if that mode has a quality setting).
A quality level of 0 may result in an incorrect image if the image is not a progressive JPEG and was built to be error-free. Setting the quality level to 0 when compressing a non-progressive JPEG may produce an incorrect image as well. The behavior is likely to be implementation-specific.
The quality setting does not affect the quantization table used in encoding or decoding. It only affects the debugging information that is written into the JPEG file.
In the -restart switch, the
System Requirements For Jpegtran:
Windows OS: Microsoft Windows 10, Windows 8, Windows 7, Windows Server 2016, Windows Server 2012, Windows Server 2012 R2, Windows Server 2008, Windows Server 2008 R2
Processor: Intel Dual Core 2.8GHz or better, AMD Dual Core 2.8GHz or better
Memory: 2GB RAM or better
Hard Disk: 4GB available space for installing the game and patch data
Supported OS: Windows 10, Windows 8, Windows 7, Windows Server 2016, Windows Server 2012, Windows Server 2012 R2,