kromo

kromo is a play on words, combining "chromatic aberration" and "lo-mo photography". I made kromo because perfect optics are overrated.

Before & After

Image of Berries, 1.0 strength

More Images

Quick Start

$ pip3 install -r requirements.txt
$ python3 kromo.py -v flower.jpg 

Original Image: JPEG (1962, 2615) RGB
Dimensions must be odd numbers, cropping...
New Dimensions: (1961, 2615)
Completed in:  43.85s

Usage

$ python3 kromo.py --help

usage: kromo.py [-h] [-s STRENGTH] [-j JITTER] [-y OVERLAY] [-n] [-o OUT] [-v]
                filename

Apply chromatic aberration and lens blur to images

positional arguments:
  filename              input filename

optional arguments:
  -h, --help            show this help message and exit
  -s STRENGTH, --strength STRENGTH
                        set blur/aberration strength, defaults to 1.0
  -j JITTER, --jitter JITTER
                        set color channel offset pixels, defaults to 0
  -y OVERLAY, --overlay OVERLAY
                        alpha of original image overlay, defaults to 0.0
  -n, --noblur          disable radial blur
  -o OUT, --out OUT     write to OUTPUT (supports multiple formats)
  -v, --verbose         print status messages

Runtime

kromo is slow, just like how film photography used to be. Clone the repo for a blast from the past.

The time complexity is O(n), so a 12MP picture takes 4 times longer than a 3MP picture.

See also

Circular & radial blur

Use depth-of-field and other lens effects