JPEGJUDGE(1)
NAME
jpegjudge - guess jpeg picture quality
SYNOPSIS
jpegjudge [ -V ] jpegjudge [ -b ] file ...
DESCRIPTION
Jpegjudge reads each argument and attempts to guess the quality with
which it was saved. Currently, only a rough indicator is calculcated,
ranging from 0 (lowest quality) to 1000 (highest quality), an extension
to other formats would be straightforward, but isn't planned.
- It can read all pictures the IJG jpeg library can read, i.e. normal and
progressive jpeg's.
- OPTIONS
- -b Display only quality indicator, suppress other information
(filenames).
- -h, --help
Display short summary of options.
- -V, --version
Display version number and exit.
BUGS
It should be possible to judge pictures stored in non-lossy formats,
too, since conversion to jpeg may influence the measurement.
The quality indicator is non-linear, and could be much better.
The algorithm to calculate the quality was made up in 10 minutes, after
staring at various histograms.
ACKNOWLEDGEMENTS
- This program contains code from the IJG jpeg software.