Photo Compare Exporter

Photo Compare Exporter is a Linux desktop before-and-after image comparator, pixel
difference analyzer, and interactive comparison exporter built for photographers,
designers, retouchers, and rendering engineers.
An offline Linux desktop alternative to JuxtaposeJS for side-by-side before-and-after
photo comparison, objective quality metrics, and standalone HTML5 slider export.

Key Features:
- Interactive Curtain & Loupe Comparator: Compare Before (A) and After (B) images
with draggable Vertical, Horizontal, and Diagonal split curtains, Onion-Skin opacity
blending, a synchronized 2x-8x pixel loupe, and objective quality metrics including
PSNR (dB), RMSE, MAE, SSIM (luminance, contrast, structure), and resolution/size deltas.
- Pixel Difference Heatmap: Compute per-pixel |A - B| amplified error maps using
Jet and Inferno false-color ramps plus an adjustable threshold binary change mask
and per-channel RGB error statistics.
- Annotated Split Card & HTML5 Slider Exporter: Render presentation-ready Before/After
split cards (PNG/JPEG) with customizable divider lines, BEFORE/AFTER pill badges,
metric footer, and magnified inset callout box, or export a zero-dependency
single-file interactive HTML5 draggable comparison slider.

Disclaimer: Photo Compare Exporter is an independent open-source project by TC Studio and is not affiliated with, endorsed by, or sponsored by Northwestern University Knight Lab.