JPEG XL Toolbox vs HDR Transformer

This application offers various JPEG XL (JXL) functionalities. Supports: * ProRAW DNG -> DNG - Lossless compression, about 1/2 of the original size - Lossy compression, about 1/6 of the original size * ProRAW DNG -> JXL - Lossy conversion, about 1/7 of the original size * DNG -> JXL - Lossy conversion, about 1/7 of the original size * HEIF -> JXL - Lossy conversion * JPEG -> JXL - Lossless conversion Features: * Keeps the internal metadata * Preserves 16-bit depth * Preserves HDR display effects in iOS Photos App * Batch conversion capabilities === CHNAGELOG === ### version 0.3.2 * Bumps libjxl to v0.10.2 * Adjusts settings view ### version 0.3.1 * Improves processing speed significantly * Adds lossless mode for ProRAW compression * Uses 7 as the default effort ### version 0.3.0 * Adds ProRAW direct compression ### version 0.2.1 * Settings page adjustment * Some UI improvements ### version 0.2.0 * Adds Pro version purchase * Adds several ProRAW parameters in settings for Pro version * Adds decoding speed in settings * Low memory mode now allows devices with 4GB RAM to convert 48M ProRAW ### version 0.1.2 * Uses lossless encoding for JPEG automatically * Adds Modular mode support * Adds Progressive mode support * Adds Colorspace support * Keeps HDR effect when converting from ProRAW ### version 0.1.1 * Adds support for ProRAW to lossy JPEG XL conversion * Adds Batch conversion * Keeps DNG Metadata in JXL * Adds quality and effort in settings

HDR Converter is a derivative product of the Prismatik app, designed to create a professional, easy-to-use, clean, and aesthetically pleasing HDR simulation and conversion tool. HDR Converter provides professional-grade HDR processing tools—from the brilliant transformation of SDR to HDR, to seamless conversion between multiple HDR formats—all completed offline on your device with 100% privacy protection. It is also optimized for Xiaohongshu (RedNote), making your posts stand out. Core Features --- HDR Simulation — Breathe New Life into Every Image Whether it's digital photography, classic artwork, or AI-generated content, HDR Simulation infuses images with realistic brightness and tonal depth. Built on Apple's official HDR Gain Map pipeline with targeted optimizations, it ensures every exported HDR photo has accurate luminance mapping and full metadata support. Smart Algorithm, One-Tap Simulation: Default parameters are automatically calculated based on in-depth image analysis, preserving natural light relationships while enhancing depth, luster, and spatial presence. Professional Manual Controls: Three core parameters—Highlight Boost, Highlight Range, and Peak Headroom—are provided, adhering to professional photography standards to reshape light with precision, not brute-force brightening. Platform-Specific Optimization: Tailored for Xiaohongshu (RedNote) and Instagram, ensuring your HDR work retains its stunning visual impact after upload. Efficient Batch Processing: Supports multi-task queue management, allowing you to add photos at any time and export individually or in batches. --- HDR Conversion — Break Down Format Barriers Say goodbye to HDR format incompatibility. HDR Converter fully supports bidirectional conversion across all major HDR standards. Supported formats include: Apple HDR (HEIF / JPEG): Perfectly compatible with the Apple ecosystem. Apple HDR (Compatible/HEIF): Optimized specifically for platforms like Xiaohongshu (RedNote), solving the issue of HDR loss after upload. ISO Gain Map (HEIF): A universal mapping standard compliant with international specifications. ISO HDR (PQ / HLG): Covers both broadcast-grade and consumer HDR standards—for example, .hif (HLG) files from Nikon Z cameras can be converted to Apple HDR (Compatible/HEIF) and shared directly to Xiaohongshu. All conversion processes preserve original metadata and support both Display P3 and sRGB color gamuts, meeting every need from professional review to social sharing. --- Privacy & Security We adhere to a strict "data localization" policy. All image processing is completed offline on your device—no uploads of any kind, no tracking components. Your work stays yours.