WebP and AVIF image support

[Glavo]

Hi Kevin,

Compared to other difficulties, the most troublesome part of TwelveMonkeys
for us was the color shift bug[1] when decoding images.
Our program allows users to choose their own background images, but this
bug is causing all WebP background pictures to appear greenish :(

Additionally, JavaFX still doesn’t natively support any high-quality
animated image format.
GIF quality is too poor. To support high-quality animated images, we had no
choice but to implement APNG decoding ourselves in the program.
However, APNG files are insanely large — one of my 5-second, 1920×1080, 60
fps animated wallpapers ends up reaching 1 GiB in size, which makes APNG
almost equally impractical.
It would be great if JavaFX could natively support animated WebP.

Glavo

[1]: https://github.com/haraldk/TwelveMonkeys/issues/734

On Thu, Dec 4, 2025 at 4:31 AM Kevin Rushforth <kevin.rushforth at oracle.com>
wrote:

> We don't currently have any plans to add such support, but could consider
> it if there was enough demand.
>
> Now that we have support for using Java2D's ImageIO an application could
> provide one or use a third-party ImageIO loader for those formats, but that
> would have similar limitations to those mentioned (it wouldn't support
> animated images and the application would need to bundle the loader).
>
> -- Kevin
>
>
> On 12/3/2025 12:09 PM, Andy Goryachev wrote:
>
> And HEIC.
>
> -andy
>
> *From: *openjfx-dev <openjfx-dev-retn at openjdk.org>
> <openjfx-dev-retn at openjdk.org> on behalf of Glavo <zjx001202 at gmail.com>
> <zjx001202 at gmail.com>
> *Date: *Wednesday, December 3, 2025 at 12:01
> *To: *openjfx-dev <openjfx-dev at openjdk.org> <openjfx-dev at openjdk.org>
> *Subject: *WebP and AVIF image support
>
> Hi,
>
> The image formats supported by JavaFX have not been updated for a very
> long time. However, more and more content providers are now adopting newer
> formats such as WebP and AVIF.
>
> For example, our application needs to display icons for Minecraft mods,
> modpacks, and other content sourced from Modrinth, and the vast majority of
> these icons are in WebP format. To work around this, we currently have to
> bundle TwelveMonkeys into our program, decode the images to BufferedImage,
> and then convert them to javafx.scene.image.Image. This approach
> significantly increases the size of our application, adds considerable
> performance overhead, does not support animated WebP, and even has a
> color-shift bug when decoding lossy-compressed WebP images.
>
> Is there any possibility that JavaFX will add native support for modern
> image formats like WebP and AVIF in the future? I noticed that the
> javafx.web module already depends on libwebp during its build, yet this
> dependency is not utilized for javafx.scene.image.Image decoding—which is
> honestly a bit of a shame. We sincerely hope that JavaFX can provide native
> support for these formats.
>
> Glavo
>
>
>
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