hdrview: vanhemmat versiot ja versiohistoria

HDRView 3.0.2 is functionally identical to [3.0.0](https://github.com/wkjarosz/hdrview/releases/tag/v3.0.0); it only improves the Linux AppImage.

• The AppImage now embeds update information, and each release publishes a `.zsync` file next to it, so AppImageUpdate and similar tools can update it in place.
• The Linux desktop and AppStream files are now named after HDRView's app ID, `io.github.wkjarosz.hdrview`.

HDRView 3.0.1 is functionally identical to [3.0.0](https://github.com/wkjarosz/hdrview/releases/tag/v3.0.0); it only fixes the Linux AppImage.

• The AppImage is now built on Ubuntu 22.04, so it runs on any Linux with glibc 2.35 or newer (Ubuntu 22.04, Debian 12, Fedora 36, and later). The 3.0.0 AppImage required glibc 2.38 and failed to start on older systems.
• The AppImage now carries AppStream metadata, so software centers and the AppImage catalog can describe it.
• `LICENSE.txt` is now the standard BSD-3-Clause text; a leftover extra paragraph that asked nothing of users was removed.

What's changed
========

This is the first HDRView release in the 3.0 series! It includes a huge amount of work across 55 pull requests and over 350 commits.

The major version bump is for four things HDRView simply could not do before:

• **HDR output on all desktop platforms**, Windows and Wayland Linux now join macOS in supporting true HDR output on compatible displays!
• **it can edit images again**, with a real undo history — the destructive editing HDRView had before the 2.0 rewrite, rebuilt on top of the modern channel/layer image model;
• **you can draw on an image** — arrows, boxes, circles, scribbles and text — to mark up what you are looking at;
• **it can act as a display server for supported renderers** to display in-progress renderings, over the same protocol [tev](https://github.com/Tom94/tev) and [PBRT](https://github.com/mmp/pbrt-v4) speak.

On top of that：sessions, multi-selection, JPEG 2000, HDR gain maps in various formats, a much faster AVIF decoder, a rebuilt statistics/histogram panel — and a *lot* of correctness work. Seven systematic bug hunts, plus AddressSanitizer, UndefinedBehaviorSanitizer, ThreadSanitizer and libFuzzer jobs in CI, turned up several crashes, memory-safety bugs, and a long list of images that were being decoded, displayed or exported *silently wrong*. HDRView now has a steadily growing arsenal of over 340 automated tests, alongside ~100 GUI regression tests.

Highlights
----------------------

• **Image editing with undo** — crop, resize, flips and rotations, blurs, unsharp mask, median, exposure/gamma and brightness/contrast curves you can drag, channel mixer, hue/saturation, color-space conversion, seamless (Poisson) paste, mip pyramid generation, environment-map remapping and irradiance convolution — all undoable, with a History panel (#208)
• **Annotations** — rectangles, ellipses, lines, arrows, freehand scribbles and text drawn over an image, in image coordinates, saved with the session and never baked into the pixels (#223, #226)
• **Live images from your renderer** — a display server speaking tev's IPC protocol, verified end to end against pbrt-v4 (#207)
• **True HDR display output on macOS, Windows and Linux/Wayland**, with the display's real headroom read from each platform and drawn in the histogram (#178, #192)
• **Sessions** (`.hsess`) — save and restore your whole working state, and export a session *bundle* that zips the images along with it (#176)
• **Multi-selection** over (image, channel group) pairs, with edits fanning out over the selection (#209)
• **HDR gain maps** from iPhone and Android photos — Apple, ISO 21496-1, Adobe XMP and JPEG XL flavors (#190)
• **JPEG 2000 and HTJ2K** read and write, including bare codestreams (#222)
• **AVIF decoding up to 6× faster** via dav1d (#206)
• **A unified Pixel statistics window** — pixel inspector, channel statistics and histogram in one panel, with a rebuilt histogram (#172, #181, #186)
• **Native Windows ARM64 builds** (#170)

Image editing, with an undo system
----------------------

Editing is back. The `Edit` menu currently contains 34 commands grouped by type. You can run edit commands on the current image, or on multiple selected images at once. Each one lands as a single step in a History panel that shows the whole stack, where you are in it, and what each step costs in memory.

• **Clipboard** — cut, copy, paste, and gradient-domain/Poisson seamless paste
• **Size and orientation** — flips, quarter turns, crop, image size, canvas size, and generating a mip pyramid as one image per level.
• **Tone** — invert, clamp, zap gremlins (NaNs/infinities), exposure/gamma, brightness/contrast, fill.
• **Color** — convert color space (which retags the image's metadata to match), channel mixer, hue/saturation, flatten over a background. CIE L\*a\*b\* was added along the way, so brightness/contrast can work on lightness alone, or on the two opponent chromaticity axes alone.
• **Channels** — ungroup a group into single channels

What's changed
This release focuses on refinements to the UI and improvements to metadata extraction and display.
• XMP parsing (via the TinyXML2 library)
• In addition to displaying the raw XMP text, the parsed XMP data is now displayed in a tree structure much like EXIF data
• Since the amount of metadata that HDRView extracts from images has increased, the Info panel now has a dropdown for which metadata to look at (General, Header, EXIF, XMP, Raw XMP data)
• HDRView now extracts metadata and colorspace/ICC profile information for PSD images
• Fixed an issue where PNG EXIF and XMP metadata wasn't being extracted properly
• XMP metadata is now extracted from TIFF files
• Minor layout/sizing tweaks to Help/About dialog
Precompiled binaries for macOS, Windows, and Linux available below.
Full Changelog：v2.7.1...v2.8.0

What's changed
This release focuses on refinements to the UI and improvements to metadata extraction and display.
• XMP parsing (via the TinyXML2 library)
• In addition to displaying the raw XMP text, the parsed XMP data is now displayed in a tree structure much like EXIF data
• Since the amount of metadata that HDRView extracts from images has increased, the Info panel now has a dropdown for which metadata to look at (General, Header, EXIF, XMP, Raw XMP data)
• HDRView now extracts metadata and colorspace/ICC profile information for PSD images
• Fixed an issue where PNG EXIF and XMP metadata wasn't being extracted properly
• XMP metadata is now extracted from TIFF files
• Minor layout/sizing tweaks to Help/About dialog
Precompiled binaries for macOS, Windows, and Linux available below.
Full Changelog：v2.7.1...v2.8.0

What's changed
This release focuses on refinements to the UI and improvements to metadata extraction and display.
• XMP parsing (via the TinyXML2 library)
• In addition to displaying the raw XMP text, the parsed XMP data is now displayed in a tree structure much like EXIF data
• Since the amount of metadata that HDRView extracts from images has increased, the Info panel now has a dropdown for which metadata to look at (General, Header, EXIF, XMP, Raw XMP data)
• HDRView now extracts metadata and colorspace/ICC profile information for PSD images
• Fixed an issue where PNG EXIF and XMP metadata wasn't being extracted properly
• XMP metadata is now extracted from TIFF files
• Minor layout/sizing tweaks to Help/About dialog
Precompiled binaries for macOS, Windows, and Linux available below.
Full Changelog：v2.7.1...v2.8.0

What's changed
This release focuses on refinements to the UI and improvements to metadata extraction and display.
- XMP parsing (via the TinyXML2 library)
- In addition to displaying the raw XMP text, the parsed XMP data is now displayed in a tree structure much like EXIF data
- Since the amount of metadata that HDRView extracts from images has increased, the Info panel now has a dropdown for which metadata to look at (General, Header, EXIF, XMP, Raw XMP data)
- HDRView now extracts metadata and colorspace/ICC profile information for PSD images
- Fixed an issue where PNG EXIF and XMP metadata wasn't being extracted properly
- XMP metadata is now extracted from TIFF files
- Minor layout/sizing tweaks to Help/About dialog
Precompiled binaries for macOS, Windows, and Linux available below.
Full Changelog: v2.7.1...v2.8.0

What's Changed
Image I/O & metadata
- ZIP archive support: HDRView can now open all images within a ZIP archive
- Extracting PNG text chunk metadata, including embedded ASCII‑hex EXIF
- Bug fix: Fixed incorrect libpng png_get_text usage that led to a crash
- If EXIF orientation is found, the appropriate rotation/flipping is applied to the pixel data on load
- Improved EXR header extraction and general metadata improvements.
- Display original encoded/numerical metadata values on hover
- More info about the image loading libraries is listed in the Build info tab of the About/Help window
Image display & UI
- Added a Relative subtract (signed) to complement the Relative difference (unsigned) error visualization mode
- Added a "Watched Folders" window to add, remove, and list currently watched folders.
- Added command to watch a folder for future changes, without loading existing images
- Added a right-click context menu for each image in File window, including ability to "Reveal in Finder"
- Bug fix: Fixed shader edge sampling that caused a flickering image border.
Build, packaging & CI
- DMG creation in CI workflow now retries up to 3 times before failing (workaround for flaky create-dmg).
Full Changelog: v2.5.3...v2.6.0-beta.1
Released Files
- Pre-built binary archive (.zip) for Microsoft Windows (extract in your desired location, and run HDRView.exe)
- Pre-built dmg installer for Apple Silicon (HDRView-arm64.dmg) or Intel (HDRView-x86_64.dmg) Macs. Make sure to download the appropriate one for your architecture!
- The binaries are not signed, so you will get an error "'HDRView' Not Opened. Apple could not verify “HDRView 2” is free of malware that may harm your Mac or compromise your privacy." Click "Done" then go to System Settings > Privacy & Security, scroll to the bottom, and click "Open Anyway" next to "HDRView was blocked to protect your Mac."

What's Changed
(This is identical to 2.5.2, but fixes a minor uv-boundary artifact in Metal)
1. DDS image support — New decoder for DDS files, including support for ASTC and BC compressed textures.
2. Animated GIFs — Animated GIF support added to the stb-based image loader.
3. JPEG/JXL/PPM/PNM loader improvements — CMYK support for JPEG and JXL images. Fixed endian bug in stb_image for 16-bit PPM/PNM.
4. More metadata — The loaders now save more metadata about the files and the Info panel shows this in the UI. Clicking
5. New blackpoint offset control
6. Histogram allows dragging the black and white points, which automatically set the exposure and offset
7. Controls to playback the loaded images as an animation with user-controllable speed
8. Clip warnings (zebra striping) controls in the menu and histogram
9. The Info and other windows now use the nvgui Property editor
10. Colorspace info is now in its own window
11. New colormap options: reverse-colormap toggle and an AbsGreys colormap.
12. Can specify a channel selector when loading images from the command line
13. Replaced "bit depth" with more general “pixel format” terminology in the Info panel
14. The Files table automatically scrolls to keep the current image/channel group in view when navigating with the keyboard
Full Changelog: v2.4.0...v2.5.1
Released Files
- Pre-built binary archive (.zip) for Microsoft Windows (extract in your desired location, and run HDRView.exe)
- Pre-built dmg installer for Apple Silicon (HDRView-arm64.dmg) or Intel (HDRView-x86_64.dmg) Macs. Make sure to download the appropriate one for your architecture!

What's Changed
(This is identical to 2.5.1, but fixes a minor vertical spacing bug in the playback toolbar)
1. DDS image support — New decoder for DDS files, including support for ASTC and BC compressed textures.
2. Animated GIFs — Animated GIF support added to the stb-based image loader.
3. JPEG/JXL/PPM/PNM loader improvements — CMYK support for JPEG and JXL images. Fixed endian bug in stb_image for 16-bit PPM/PNM.
4. More metadata — The loaders now save more metadata about the files and the Info panel shows this in the UI. Clicking
5. New blackpoint offset control
6. Histogram allows dragging the black and white points, which automatically set the exposure and offset
7. Controls to playback the loaded images as an animation with user-controllable speed
8. Clip warnings (zebra striping) controls in the menu and histogram
9. The Info and other windows now use the nvgui Property editor
10. Colorspace info is now in its own window
11. New colormap options: reverse-colormap toggle and an AbsGreys colormap.
12. Can specify a channel selector when loading images from the command line
13. Replaced "bit depth" with more general “pixel format” terminology in the Info panel
14. The Files table automatically scrolls to keep the current image/channel group in view when navigating with the keyboard
Full Changelog: v2.4.0...v2.5.1
Released Files
- Pre-built binary archive (.zip) for Microsoft Windows (extract in your desired location, and run HDRView.exe)
- Pre-built dmg installer for Apple Silicon (HDRView-arm64.dmg) or Intel (HDRView-x86_64.dmg) Macs. Make sure to download the appropriate one for your architecture!

What's Changed
(This is identical to 2.5.0, but fixes a compile error for the emscripten webapp)
1. DDS image support — New decoder for DDS files, including support for ASTC and BC compressed textures.
2. Animated GIFs — Animated GIF support added to the stb-based image loader.
3. JPEG/JXL/PPM/PNM loader improvements — CMYK support for JPEG and JXL images. Fixed endian bug in stb_image for 16-bit PPM/PNM.
4. More metadata — The loaders now save more metadata about the files and the Info panel shows this in the UI. Clicking
5. New blackpoint offset control
6. Histogram allows dragging the black and white points, which automatically set the exposure and offset
7. Controls to playback the loaded images as an animation with user-controllable speed
8. Clip warnings (zebra striping) controls in the menu and histogram
9. The Info and other windows now use the nvgui Property editor
10. Colorspace info is now in its own window
11. New colormap options: reverse-colormap toggle and an AbsGreys colormap.
12. Can specify a channel selector when loading images from the command line
13. Replaced "bit depth" with more general “pixel format” terminology in the Info panel
14. The Files table automatically scrolls to keep the current image/channel group in view when navigating with the keyboard
Full Changelog: v2.4.0...v2.5.1
Released Files
- Pre-built binary archive (.zip) for Microsoft Windows (extract in your desired location, and run HDRView.exe)
- Pre-built dmg installer for Apple Silicon (HDRView-arm64.dmg) or Intel (HDRView-x86_64.dmg) Macs. Make sure to download the appropriate one for your architecture!

What's Changed
1. DDS image support — New decoder for DDS files, including support for ASTC and BC compressed textures.
2. Animated GIFs — Animated GIF support added to the stb-based image loader.
3. JPEG/JXL/PPM/PNM loader improvements — CMYK support for JPEG and JXL images. Fixed endian bug in stb_image for 16-bit PPM/PNM.
4. More metadata — The loaders now save more metadata about the files and the Info panel shows this in the UI. Clicking
5. New blackpoint offset control
6. Histogram allows dragging the black and white points, which automatically set the exposure and offset
7. Controls to playback the loaded images as an animation with user-controllable speed
8. Clip warnings (zebra striping) controls in the menu and histogram
9. The Info and other windows now use the nvgui Property editor
10. Colorspace info is now in its own window
11. New colormap options: reverse-colormap toggle and an AbsGreys colormap.
12. Can specify a channel selector when loading images from the command line
13. Replaced "bit depth" with more general “pixel format” terminology in the Info panel
14. The Files table automatically scrolls to keep the current image/channel group in view when navigating with the keyboard
Full Changelog: v2.4.0...v2.5.0
Released Files
- Pre-built binary archive (.zip) for Microsoft Windows (extract in your desired location, and run HDRView.exe)
- Pre-built dmg installer for Apple Silicon (HDRView-arm64.dmg) or Intel (HDRView-x86_64.dmg) Macs. Make sure to download the appropriate one for your architecture!

What's Changed
Major Feature Improvements
This release mainly has quality-of-life improvements:
1. HDRView now has GUI themes. Choose from a dozen or so predefined themes, or customize and save your own. The theme is saved and restored on startup.
2. This includes the ability to change the overall font size used in the GUI, which is also saved/restored.
3. The size and position of the HDRView window is now also saved/restored.
4. JPEG files are now loaded using libjpeg-turbo. This provides better metadata, and icc profile handling, including support for CMYK JPEGs.
5. Improvements to the chromaticity diagram: better interaction support, support for zooming/panning, and the Plankian locus is shown
Full Changelog: v2.3.0...v2.4.0
Released Files
- Pre-built binary archive (.zip) for Microsoft Windows (extract in your desired location, and run HDRView.exe)
- Pre-built dmg installer for Apple Silicon (HDRView-arm64.dmg) or Intel (HDRView-x86_64.dmg) Macs. Make sure to download the appropriate one for your architecture!

What's Changed
Major Feature Improvements
1. Expanded file format support and metadata
- With many "traditional" image formats now starting to add HDR support, it would be silly if a program named HDRView could not display those properly. HDRView now supports JPEG-XL, HEIF/HEIC, AVIF, PNG third edition, and UltraHDR JPEG images.
- Support for loading all frames for some animated image formats: APNG (animated PNG), HEIF, AVIF, JPEG-XL
- Now uses libpng (instead of stb_image) for PNG loading and saving, to support PNG (and APNG) third edition, and better color profile and metadata support.
- HDRView now extracts and displays more metadata, including all EXIF data, and all fields in the EXR header
2. Color Management and Chromaticity
- HDRView is now fully color managed. It extracts and applies ICC profiles, chromaticities of primaries and whitepoint, and supports the recent coding-independent code points (CICP) for specifying pre-defined (HDR) color spaces.
- The detected colorspace, primaries and white point are shown in the Info window by name, numerically, plotted on a CIE chromaticity diagram, and can be modified interactively. The whitepoint adaptation mode (none, Bradford, von Kries) can be chosen.
3. Colormaps and tonemapping overhaul
- The tone mapping mode can now be chosen from Gamma, Colormap (+), and Colormap (+/-).
- The colormap modes allow choosing from a dozen or so popular colormaps (Viridis, Inferno, Turbo, etc.), including several diverging colormaps more suitable for visualizing positive/negative values.
- Added a Python script for sampling and generating colormap data.
- sRGB is no longer an option. All images are converted to the sRGB/BT.709 color gamut for display. The Gamma tonemapping value is applied in addition to the sRGB response curve.
4. UI improvements
- A new icon!
- Added horizontal and vertical image flipping.
- Added "fit selection" and "Auto fit selection" view commands.
- Pixel statistics, histogram, and watched pixel values should now all be blend-mode aware
- Added ability to load all images from a folder.
- Can now reload a file, or all loaded files
- Can "watch" loaded folders and images for changes and new files.
- New zebra-stripe mode for showing pixels clipped pixel values
Minor Updates and Fixes
- updated to newest versions of Hello ImGui and dear imgui, and ImPlot.
- made github workflow scripts more robust to package updates in github's runners
- Added some more keyboard shortcuts, and menu icons
- preliminary support for loading only some parts/channels of an image by matching against a text filter. Currently this is only used for reloading the correct part for multi-part images (since HDRView splits files with multiple parts into separate "images" shown in the interface)
Full Changelog: v2.2.1...v2.3.0
Released Files
- Pre-built binary archive (.zip) for Microsoft Windows (extract in your desired location, and run HDRView.exe)
- Pre-built dmg installer for Apple Silicon (HDRView-arm64.dmg) or Intel (HDRView-x86_64.dmg) Macs. Make sure to download the appropriate one for your architecture!

What's Changed
Compared to v2.2.0 this just fixes the macOS pre-built binary to include a few more libheif dependencies (AV1 codec support in particular). v2.2.0 release notes follow:
New features:
- support for new image formats: QOI, JPEG-XL, Ultra HDR jpegs, and HEIF/AVIF files (not in emscripten for now)
- this even includes multi-image and auxiliary-channel support in JXL and HEIF/AVIF files, and HDR via PQ and HLG transfer functions
- better support for ICC profiles and colorspaces via Little-CMS
- extracting more image meta data during loading, which is displayed in the Info panel
- the emscripten/web version supports opening files via drag-n-drop
- the emscripten/web version has a loading screen as the program data is downloaded
- the emscripten/web version now supports passing command-line arguments via URL query strings
- can choose between multiple icon fonts during cmake configure
Fixes:
- fixed wasm crash when canceling file open
- better support for local (system-installed) dependencies
- fixed issue where mobile Safari would first convert all images to BMPs before loading (removing all HDR info)
- pixel inspector color buttons now render correctly for grayscale + alpha channel groups
Full Changelog: v2.1.0...v2.2.1
Released Files
- Pre-built binary archive (.zip) for Microsoft Windows (extract in your desired location, and run HDRView.exe)
- Pre-built dmg installer for Apple Silicon (HDRView-arm64.dmg) or Intel (HDRView-x86_64.dmg) Macs. Make sure to download the appropriate one for your architecture!