YabiVision

YabiVision turns your ordinary SDR photos into Adaptive HDR images with embedded Gain Maps, following the ISO 21496-1 standard. The exported photos display vibrant HDR highlights on capable screens and fall back gracefully to standard dynamic range on older devices. Load any photo from your library, adjust the HDR gain strength with a live preview slider, and export as HEIC or JPEG -- the result saves directly to your Photos with the HDR badge. No account needed, no subscriptions, no watermarks. Just better photos. For advanced users, YabiVision also lets you extract the Gain Map from an existing HDR photo as a grayscale image, import your own custom Gain Map (PNG), and compose it with an SDR base to produce precisely controlled HDR output. Key features: - Convert any SDR photo to Adaptive HDR (ISO 21496-1) with one tap - Adjustable gain strength with real-time HDR preview - Export as HEIC (recommended) or JPEG with embedded Gain Map - Extract Gain Maps from existing HDR photos - Import custom Gain Maps and compose HDR from SDR + Gain Map - Works on iPhone and iPad - Requires iOS 16+; HDR preview on iOS 17+; full HDR decode on iOS 18+ - Completely free, no ads, no in-app purchases