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
or
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)
First 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/ -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
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.