imgdiff

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'

Installation

pip install imgdiff or download it from PyPI.

Usage

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)

Output Examples

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

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.