Photo Upscale Sharpener

Photo Upscale Sharpener is a desktop image enlargement and detail recovery
tool built on deterministic multi-pass Lanczos and Bicubic resampling,
edge-preserving median denoising, and tunable unsharp masking.
An independent open-source Linux photo enlargement studio running 100%
locally with honest, artifact-free signal processing.

Key Features:
- Multi-Pass Lanczos & Detail Recovery: Enlarge photos by 1.5x, 2x, 3x, 4x,
or custom target dimensions using progressive 2x Lanczos stages,
edge-aware median denoise, tunable UnsharpMask (radius, percent,
threshold), and micro-contrast clarity.
- 4x Loupe & Sharpness Inspector: Interactive Before/After split curtain
paired with a synchronized 4x pixel Loupe comparing nearest-neighbor
baseline against sharpened Lanczos output, with live Laplacian edge
sharpness index and PSNR metrics.
- Batch Folder Upscaler: Enlarge queues of photos to PNG, JPEG, or WebP
with a CSV before-and-after resolution and sharpness report.

Disclaimer: Photo Upscale Sharpener is an independent open-source project by TC Studio and is not affiliated with, endorsed by, or sponsored by any third-party photo software vendor.