The Lab color space conversion requires a cube root (3× per pixel even), which is expensive to compute in a general case. Fortunately, the range required by Lab can be computed more efficiently.

The zip has macOS and Windows binaries.

• WASM compatibilty
• Performance improvements

Includes universal binary for M1 Macs

Complete rewrite of the project in Rust:

• Chroma channels are compared at full resolution. This increases accuracy on images with chroma subsampling.
• All scaling is done in linear-light premultiplied-alpha color space, which further increases accuracy.
• Safe and reliable code. No more dodgy pointer manipulation.

Important regression: only PNG files are supported, and they're assumed to always be in the sRGB color space. Please be very careful when converting/comparing images with color profiles, because differences from color profile (mis)interpretation are often very large and make DSSIM scores bogus.

• Fixed handling of PNG files with invalid chunks
• Fixed handling of color channels smaller than 8 pixels

• Error handling of invalid gamma
• Support reading stdin as - file

• Shows more digits of result
• Changed blur implementation