Filter Studio: Photo FX

FilterStudio is a professional, on-device photo editor engineered for speed, control and privacy. Built on Apple Core Image and PencilKit, it delivers studio-grade output without a server round trip and without a single subscription prompt. ENGINE • 15 hand-tuned filters mapped to native CIFilter primitives — Mono, Noir, Fade, Chrome, Process, Transfer, Instant, Sepia, Vivid, Dramatic, Silvertone, Posterize, Bloom, Vignette, Original. • Real-time GPU pipeline — every slider rebuilds the preview at native resolution. • Lossless export — output written back to Photos at the full input pixel size, no recompression artifacts beyond standard PNG/JPEG. ADJUSTMENTS • Brightness — linear exposure offset. • Contrast — perceptual contrast curve. • Saturation — chroma scaling, clamped against banding. • Live preview, no commit step. LAYER SYSTEM • Text layer — UTF-8, dynamic font sizing, color and bold control, free positioning. • Sticker layer — vector-style emoji and shapes, scale and rotate. • Drawing layer — Apple Pencil first, finger fallback, multi-color. • Layers composited at export time, original photo never overwritten in place. WORKFLOW 1. Pick a photo via the system PhotosUI picker. 2. Apply filter, adjust, add text/stickers, doodle. 3. Crop and rotate if needed. 4. Tap Save — written to Photos with library write authorization only. PRIVACY & SECURITY • Strict on-device processing. No analytics, no telemetry, no third-party SDKs. • Photos library access is request-once, write-only by default. • No user account, no email collection, no IDFA usage. LOCALIZATION English and Simplified Chinese, switchable from in-app settings. REQUIREMENTS iOS 17.0 or later. iPhone only. PRICING Free. No tier, no consumable, no in-app purchase. FilterStudio is for users who want professional control without subscription friction. Install once, edit forever.