arcmathThe #EXR high dynamic range motion picture file format now supports lossless #HTJ2K compression.
https://openexr.com/en/latest/news.html#september-5-2025-openexr-3-4-0-released
https://aras-p.info/blog/2025/07/08/Lossless-Float-Image-Compression/
Jan-Hendrik MüllerI just released a new Blender extension for blurring images and scene backgrounds: https://extensions.blender.org/add-ons/blur-hdri/
Under the hood, it uses the image processing libraries @pillow and #OpenEXR.
If you have ideas to build blender extensions yourself, join Brady Johnston and me at our talk “Extensions are Coming” at the Blender Conference next week, were we will be talking about how to develop Blender extensions. https://conference.blender.org/2025/presentations/4028/
(Recordings will be available as well.)
GripNews🌘 無損浮點圖像壓縮
➤ 多層浮點圖像壓縮格式比較與性能分析
✤ https://aras-p.info/blog/2025/07/08/Lossless-Float-Image-Compression/
本文探討了針對多層浮點圖像進行無損壓縮的最佳方法，主要針對電影製作流程中使用的圖像，這些圖像通常包含RGB以外的通道，例如環境光遮蔽、直接光照、深度等。作者比較了OpenEXR（ZIP和新的HTJ2K壓縮模式）和JPEG-XL兩種格式的壓縮比和性能，並提出了一種自定義壓縮方案，在速度和壓縮比上都優於現有方案。 結論是，OpenEXR仍然是首選，而JPEG-XL在速度上存在明顯劣勢，儘管在高壓縮力度下可以獲得更好的壓縮比。此外，作者建議OpenEXR未來可能改進HTJ2K的性能。
+ 這篇文章的測試數據很詳盡，對於需要處理大量浮點圖像資料的專業人士來說，非常有參考價值。
+ 我一直覺得圖像壓縮很複雜，這篇文章用清晰的方式解釋了各種壓縮格式的優缺點，讓我對OpenEXR和JPEG-XL有了更深入的瞭解。
#圖像壓縮 #OpenEXR #JPEG-XL #性能分析
➤ 多層浮點圖像壓縮格式比較與性能分析
✤ https://aras-p.info/blog/2025/07/08/Lossless-Float-Image-Compression/
本文探討了針對多層浮點圖像進行無損壓縮的最佳方法，主要針對電影製作流程中使用的圖像，這些圖像通常包含RGB以外的通道，例如環境光遮蔽、直接光照、深度等。作者比較了OpenEXR（ZIP和新的HTJ2K壓縮模式）和JPEG-XL兩種格式的壓縮比和性能，並提出了一種自定義壓縮方案，在速度和壓縮比上都優於現有方案。 結論是，OpenEXR仍然是首選，而JPEG-XL在速度上存在明顯劣勢，儘管在高壓縮力度下可以獲得更好的壓縮比。此外，作者建議OpenEXR未來可能改進HTJ2K的性能。
+ 這篇文章的測試數據很詳盡，對於需要處理大量浮點圖像資料的專業人士來說，非常有參考價值。
+ 我一直覺得圖像壓縮很複雜，這篇文章用清晰的方式解釋了各種壓縮格式的優缺點，讓我對OpenEXR和JPEG-XL有了更深入的瞭解。
#圖像壓縮 #OpenEXR #JPEG-XL #性能分析
Minkiu#GIMP now has support for multichannel #openexr #vfx thanks to @CmykStudent !
Stefan IhringerNot tested the myself but it might come in handy!
#VFX #OpenEXR
https://github.com/finnschi/heic-shenanigans
(via @www.pixelsham.com )
pafurijaz#OpenEXR best practices
- Real-Time Playback/Compositing: Use B44/B44A or DWA for faster I/O .
- CGI/Rendered Content: ZIP (lossless) or PIZ (smaller files) .
- Texture Maps: ZIP for fast access .
- Layered EXRs: ZIPS for scanline efficiency .
- Avoid Lossy Compression for non-color data (e.g., normals, depth). #exr #vfx #rendering #b3d #CGI
- Real-Time Playback/Compositing: Use B44/B44A or DWA for faster I/O .
- CGI/Rendered Content: ZIP (lossless) or PIZ (smaller files) .
- Texture Maps: ZIP for fast access .
- Layered EXRs: ZIPS for scanline efficiency .
- Avoid Lossy Compression for non-color data (e.g., normals, depth). #exr #vfx #rendering #b3d #CGI
Jezus Michał "Le Wzdych" (on)Powiedziałbym, że dla #EasyCLA bardziej pasowałaby nazwa "skomplikowane i zepsute CLA".
Po tym, jak w końcu udało mi się wysłać wniosek o CLA dla #OpenEXR, firma dalej go nie widziała. Spróbowałem jeszcze raz, i tym razem udało im się zaakceptować. Tyle że EasyCLA dalej twierdziło, że nie jest podpisane.
Ale już po problemie, bo jakiś przypadkowy typ postanowił wziąć moją łatkę, wraz z oryginalnym opisem zmian, usunąć moje dane osobowe i wysłać ją, przy okazji zamykając moją — a autorzy od razu to przyjęli. Nie, żeby to robiło jakąś szczególną różnicę, bo łatka była trywialna (do tego stopnia, że ta cała bieganina wokół CLA nie miała żadnego sensu), ale i tak niefajnie, jak ktoś kradnie twoją pracę i usuwa autorstwo.
Jesus Michał "Le Sigh" 🏔 (he)I dare say a better name for #EasyCLA would be "convoluted and broken CLA".
Even after I was finally able to submit the CLA for #OpenEXR, the company couldn't find it. After another attempt, they were finally able to approve it. Except that it still claimed I'm unapproved.
However, that's not a problem anymore, because some random decided to take my patch, up to the commit message, wipe my authorship from it and submit it with a closing tag on my pull request — and upstream gladly merged that. I mean, it was a trivial patch (so trivial the whole CLA business was entirely pointless), so it's not like it matters, but it still feels wrong when people steal your work and remove authorship.
Wojciech Jarosz has movedI released v2.1.0 of my #research oriented #HighDynamicRange image viewer HDRView yesterday. Worked on lots of changes and improvements over the holiday break. Get the deets and binary downloads at the link below.
#hdr, #graphics, #rendering, #openexr, #cgi, #webgl, #macos, #dearimgui,
HDRView v2.0 is out!
Release notes and Mac and Windows binaries here: https://github.com/wkjarosz/hdrview/releases/tag/v2.0
Also runs on Linux (no binaries yet) and directly in your browser, even on iPhone/iPad! (just go to https://wkjarosz.github.io/hdrview/).
