Image Size Optimizer

Image Size Optimizer is a desktop batch image compressor, palette quantizer,
Target-KB auto-fitter, and interactive split-preview analyzer for Linux.
An independent Linux desktop alternative to Caesium Image Compressor for batch
image optimization, lossless and lossy encoding, and side-by-side quality checks.

Key Features:
- Batch PNG, JPEG & WebP Compression: Quantizes RGBA PNGs via Fast Octree and RGB
PNGs via Median Cut (16 to 256 colors) with level-9 zlib compression, encodes
progressive JPEG with configurable 4:4:4, 4:2:2, or 4:2:0 chroma subsampling and
EXIF metadata removal, and supports both lossy and lossless WebP output.
- Target-KB Auto-Fit & Lanczos Scaling: Runs binary search across JPEG/WebP quality
or PNG palette color counts to fit within a strict file-size budget, with optional
Lanczos maximum-dimension scaling and real PSNR (dB) measurement.
- Interactive Split Before/After & 4x Pixel Loupe: Compares original and compressed
pixels side-by-side with a draggable vertical curtain and real-time 4x zoom loupe.
- Multi-Format Preset Benchmark: Evaluates six presets (PNG-256, PNG-64, JPEG Q85,
JPEG Q70, WebP Q80, WebP Lossless) in memory with encode timings and size charts,
plus batch folder export and CSV/JSON reporting.

Disclaimer: This project is an independent open-source tool and is not affiliated with, sponsored by, or endorsed by SaeraSoft or Caesium.