HDR image support

[Phil Race]

It is something we are aware of, but isn't something we are resourced to 
do, not even to look into it.

-phil.

On 10/6/2025 4:57, Liam Miller-Cushon wrote:
>
> Hi,
>
>
> Are there any plans around HDR image support in the JDK?
>
>
> My colleague Alec Mouri provides the following background:
>
>
> Advancements in display and imaging technology have enabled HDR (High 
> Dynamic Range) content, which allows for displaying content at a 
> greater luminance than SDR (Standard Dynamic Range) content. Google 
> <https://android-developers.googleblog.com/2025/08/what-is-hdr.html>and 
> Adobe <https://blog.adobe.com/en/publish/2023/10/10/hdr-explained>have 
> informative blog posts explaining this new technology.
>
>
> HDR images are part of intentional standards ISO 22028-5 
> <https://www.iso.org/standard/81863.html>and ISO 21496-1 
> <https://www.iso.org/standard/86775.html>. ISO 21496-1 in particular 
> is heavily used by the mobile ecosystem to generate high-quality 
> images. See the UltraHDR 
> <https://developer.android.com/media/platform/hdr-image-format>image 
> format as an example.
>
>
> Every major operating system now has support for rendering HDR GUIs. 
> See: Android’s ExtendedRangeBrightness 
> <https://developer.android.com/reference/android/view/SurfaceControl.Transaction#setExtendedRangeBrightness(android.view.SurfaceControl,%20float,%20float)>and 
> COLOR_MODE_HDR 
> <https://developer.android.com/reference/android/content/pm/ActivityInfo#COLOR_MODE_HDR>, 
> Apple’s EDR 
> <https://developer.apple.com/documentation/metal/displaying-hdr-content-in-a-metal-layer>, 
> and Wayland’s HDR Protocol 
> <https://www.phoronix.com/news/Wayland-CM-HDR-Merged>, and Window’s 
> Advanced Color 
> <https://learn.microsoft.com/en-us/windows/win32/direct3darticles/high-dynamic-range>.
>
>
> Platforms built on top of these OSs are accordingly adding support for 
> HDR. See: QT <https://doc.qt.io/qt-6/qrhiswapchainhdrinfo.html>and CSS 
> <https://www.w3.org/TR/css-color-hdr-1/>.
>
>
> Support in the JDK would involve decoding and display support.
>
>
> Decoding support could be added to Image I/O. For ISO 22028-5, this 
> means that ICC_ColorSpace 
> <https://docs.oracle.com/javase/8/docs/api/java/awt/color/ICC_ColorSpace.html>could 
> support CICPs as described in ITU-T H.273 
> <https://www.itu.int/rec/T-REC-H.273>to represent HLG and PQ 
> encodings. For ISO 21496-1, this means that BufferedImage 
> <https://docs.oracle.com/javase/8/docs/api/java/awt/image/BufferedImage.html>could 
> be decorated with a gainmap representation.
>
>
> Display support could be added to Swing and JavaFX. This would involve 
> interacting with each major OS’s capabilities to color manage and draw 
> HDR images through ImageIcon or JComponent. Note that SDR content 
> should not be colorimetrically affected when there is no HDR on 
> screen. I.e., the rest of the UI should not “flicker”.
>
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