This is a GIMP plugin that add the ability to perform a Lens Blur (also know as Bokeh Blur).

This code is based on Mike Pound's implementation created for this Computerphile video. I changed the code to use OpenCV for performance gains.

Many thanks to Niklas Liebig for the alpha channel correction! :)

This plugin has been tested on Ubuntu 18.04 and GIMP 2.10.8.

To use this plugin you have to install the following dependencies in the Python environment used by GIMP:

pip install numpy opencv-python

1. Open the terminal, move to the GIMP plug-ins folder (usually ~/.config/GIMP/2.10/plug-ins).

2. git clone https://github.com/Davide-sd/GIMP-lens-blur.git

3. cd GIMP-lens-blur

4. Change permission to allow execution: chmod +x GIMP-lens-blur.py

1. Open GIMP and load the image you'd like to edit.

2. In the layer palette, select the layer you would like to apply the lens blur.

3. Go to Filters/Blur/Lens Blur...

4. Adjust the parameters:

   • Radius: The amount of blur to add.
   • Components: The more components, the better the final result, but the slower the computation. Even with 2 components the result is very nice.
   • Gamma: tweak the exposure to highlight bright spots.

5. Click Ok.

1. Is it possible to implement a preview window?