dhash (via) Python library to calculate the perceptual difference hash for an image. Delightfully simple algorithm that’s fully explained in the README—it works by scaling the image to 8x8 grayscale and then creating a bitmap representing of each pixel is lighter or darker than the previous one.
Recent articles
- Highlights from my appearance on the Data Renegades podcast with CL Kao and Dori Wilson - 26th November 2025
- Claude Opus 4.5, and why evaluating new LLMs is increasingly difficult - 24th November 2025
- sqlite-utils 4.0a1 has several (minor) backwards incompatible changes - 24th November 2025