imgdiff 1.4.0

Installation

pip install imgdiff or download it from PyPI.

Usage

Run imgdiff --help to see this help message:

Usage: imgdiff 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)
  --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)
  --selftest            run unit tests

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 Bazaar repository: https://code.launchpad.net/~mgedmin/imgdiff/trunk.

To check it out, use bzr branch lp:imgdiff.

Report bugs at https://bugs.launchpad.net/imgdiff.

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.