Present two images side-by-side for visual comparison
A 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=imgdiff
bzr diff *.png --using='imgdiff --eog -H'
pip install imgdiff or download it from PyPI.
Run imgdiff --help to 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)
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/ -H
You can see that it doesn’t work very well, although it can produce nice results in simpler cases:
imgdiff set1/42.png set2/ -H
Support and Development
The source code can be found in this Git repository: https://github.com/mgedmin/imgdiff.
To check it out, use git clone https://github.com/mgedmin/imgdiff.
Report bugs at https://github.com/mgedmin/imgdiff/issues.
Claim Python 3.6 and 3.7 support (no code changes required).
Drop Python 3.3 and 3.4 support.
Clarify the help message for the --opacity option.
Add Python 3.5 support.
Drop Python 2.6 and 3.2 support.
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.)
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).
Depend on Pillow instead of PIL.
Moved to GitHub.
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.
First public release. Options supported: -o, –viewer, –grace, –auto, –lr, –tb, –help.
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Hashes for imgdiff-1.7.1-py2.py3-none-any.whl