JPEG XL Toolbox vs Celvion Stack

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

Build a stronger image from a sequence of photos, right on your iPhone or iPad. Celvion Stack brings importing, frame review, alignment, stacking, editing, and export together in one on-device workflow. SIX WAYS TO STACK • Night scenes: combine exposures to reduce random noise while retaining natural detail. • Milky Way: align the sky separately from the foreground for sharper stars and a stable landscape. • Light trails: blend selected frames into continuous trails. • Smooth water and clouds: create a softer motion effect from a sequence. • Moving distractions: reduce the impact of people, vehicles, and other elements that appear in only some frames. • Landscapes: combine aligned frames for a cleaner result. CONTROL YOUR MILKY WAY STACK Choose a reference frame, review frame quality, adjust sky and foreground masks, and inspect which frames are included. These controls help you adapt the result to your source images. SUPPORTED RAW AND EVERYDAY PHOTOS Import supported RAW/DNG files and standard photos. RAW compatibility depends on the camera file and the available decoder. Lens correction applies geometric distortion profiles when a supported profile or embedded calibration matches; automatic vignetting and chromatic-aberration correction are not included. ON-DEVICE AI TOOLS Use optional AI denoising and up to 4× super-resolution on supported iPhone and iPad devices with iOS or iPadOS 18 or later. Results depend on the source image. Core stacking workflows require iOS or iPadOS 17 or later. FULL-RESOLUTION EXPORT Export as JPEG, PNG, 16-bit TIFF, or 10-bit HEIF. Choose available color-space and DPI options, then save locally to Files or, where supported, Photos. YOUR PHOTOS STAY ON YOUR DEVICE Photo processing runs on your device. The app does not upload your source photos for processing.