Package: imgdiff
imgdiffA command-line tool that combines two pictures into a single, larger
one, and opens a GUI window (provided by the Python Imaging Library)
or an external image viewer.You could use it with a version control tool, e.g.bzr diff *.png --using=imgdifforbzr diff *.png --using='imgdiff --eog -H'Installationpip install imgdiffordownload it from PyPI.UsageRunimgdiff--helpto see this help message:Usage: imgdiff [options] image1 image2

Compare two images side-by-side

Options:
  -h, --help            show this help message and exit
  -o OUTFILE            write the combined image to a file
  --viewer=COMMAND      use an external image viewer (default: builtin)
  --eog                 use Eye of Gnome (same as --viewer eog)
  --grace=SECONDS       seconds to wait before removing temporary file when
                        using an external viewer (default: 1.0)
  -H, --highlight       highlight differences (EXPERIMENTAL)
  -S, --smart-highlight
                        highlight differences in a smarter way (EXPERIMENTAL)
  --opacity=OPACITY     minimum opacity for highlighting (default 64)
  --timeout=TIMEOUT     skip highlighting if it takes too long (default: 10
                        seconds)
  --auto                pick orientation automatically (default)
  --lr, --left-right    force orientation to left-and-right
  --tb, --top-bottom    force orientation to top-and-bottom
  --bgcolor=RGB         background color (default: fff)
  --sepcolor=RGB        separator line color (default: ccc)
  --spacing=N           spacing between images (default: 3 pixels)
  --border=N            border around images (default: 0 pixels)Output ExamplesFirst example:imgdiff set1/42.png set3/Here the images are wide and short, so imgdiff decided to put them one above
the other.Same example, with highlighting enabled:imgdiff set1/42.png set3/ -HYou can see that it doesn’t work very well, although it can produce nice
results in simpler cases:imgdiff set1/42.png set2/ -HSupport and DevelopmentThe source code can be found in this Git repository:https://github.com/mgedmin/imgdiff.To check it out, usegit clonehttps://github.com/mgedmin/imgdiff.Report bugs athttps://github.com/mgedmin/imgdiff/issues.Changes1.7.1 (2019-04-23)Claim Python 3.6 and 3.7 support (no code changes required).Drop Python 3.3 and 3.4 support.1.7.0 (2016-09-17)Clarify the help message for the--opacityoption.Add Python 3.5 support.Drop Python 2.6 and 3.2 support.1.6.0 (2014-12-01)Add Python 3 support.Make the –timeout option actually work.Drop the –selftest option.  Add a real test suite with 100% coverage
(which actually means little, since these are smoke tests that don’t
inspect the results for correctness.)1.5.0 (2013-08-11)Suppress progress output if stderr is not a terminal.Make it possible to abort –highligh/–smart-highlight logic by pressing ^C.Abort –highlight/–smart-highlight logic if it takes longer than 10 seconds
(timeout changeable with –timeout; use 0 to turn it off).1.4.1 (2013-08-09)Depend on Pillow instead of PIL.Moved to GitHub.1.4.0 (2010-12-19)Accepts directory names:imgdiff dir1/img.png dir2/.Centers images relative to each other if they have different width/height.Automatic orientation (–auto) uses the golden ratio (1:1.618) as its goal
for desired height:width instead of a 1:1 square.New experimental options: –highlight (-H) and –smart-highlight (-S).
These highlight areas that are different and fade out areas that are
similar.  Or at least they try.New options for tweaking the output: –bgcolor, –sepcolor, –spacing,
–border, –opacity.New option: –eog as alias for –viewer eog, but shorter.  Guess what
desktop environment I’m using.  ;-)A puny “test suite”, runnable with imgdiff –selftest.Better source code documentation via docstrings.1.3.0 (2010-12-18)First public release.  Options supported: -o, –viewer, –grace, –auto,
–lr, –tb, –help.