image-diff

This is software for visually displaying the difference between two images.

The Purpose of This Software

This software has been developed to solve "spot the difference" easily.

Requirement

• Python 3.6 or later
• opencv-python 4.6.0 or later
• numpy 1.19 or later

Installation

pip install opencv-python
pip install numpy

Usage

usage: image_diff.py [-h] [-rx RANGE_X] [-ry RANGE_Y] [-th THRESH] [-j JOBS]
                     FILE1 FILE2

positional arguments:
  FILE1                 A first image file name to compare.
  FILE2                 A second image file name to compare.

optional arguments:
  -h, --help            show this help message and exit
  -rx RANGE_X, --range-x RANGE_X
                        Range of X coordinates to move the image.
  -ry RANGE_Y, --range-y RANGE_Y
                        Range of Y coordinates to move the image.
  -th THRESH, --thresh THRESH
                        Threshold to be considered different pixel if greater
                        than.
  -j JOBS, --jobs JOBS  Number of jobs to process.

Let's try sample.

python image_diff.py ./sample/rena1.jpg ./sample/rena2.jpg 
image-diff version 1.00
(https://github.com/kazumasa-kusaba/image-diff)

[=================================================>] 100.0%
(A windows will appear on your screen...)

If it does not work well, try the following things.

• Use "-rx", "-ry" options
  • These are values that determine the range to move the image.
  • If the value is set, this software try to move an image and find the place where color differences are minimal.
  • Unit is pixel.
  • A few pixels is recommended.
• Use "-th" option
  • You can change the value between 0 ~ 255.
  • If the value is set low, more differences will appear.