Ultra HDR support

[BluePixel4k]

It would be useful if Imaginary would supported the generation of HDR images.

Many Android phone displays support HDR:
https://developer.android.com/media/grow/ultra-hdr/display

https://developer.android.com/media/platform/hdr-image-format

As a reference, ImageMagick supports it already:
https://imagemagick.org/script/high-dynamic-range.php

In relation to pulsejet/memories#1110

Thank you!

[cromefire]

UltraHDR support depends on libvips/libvips#4645. HDR support should already be in libvips, but I'm not sure if there's something necessary on bimg's or imaginary's side to enable that.

[BluePixel4k]

Good to know, thx.

Maybe I have to change the title to ultra HDR to make it clearer.

However, it seems that Imaginary is not currently being actively developed?