miikah/libultrahdr repository overview

Docker image for https://github.com/google/libultrahdr⁠

Exposes the ultrahdr_app "demo app".

Display available usage options:

docker run --rm -v $PWD/:/data miikah/libultrahdr

Create a HDR Gain Map image with ISO 21496-1 metadata from a base image, a greyscale gain map image and metadata.cfg:

docker run --rm -v $PWD/:/data miikah/libultrahdr -m 0 -i base-image.jpg -g gainmap.jpg -f metadata.cfg -z output_ultrahdr.jpg

Sample contents for metadata.cfg:

--maxContentBoost 6.0
--minContentBoost 1.0
--gamma 1.0
--offsetSdr 0.0
--offsetHdr 0.0
--hdrCapacityMin 1.0
--hdrCapacityMax 50.0
--useBaseColorSpace 1

Notes:

• v2.0.1 allows .avif and .heic output using RAW input images
• Starting from v2.0.0 this image no longer enforces UHDR_WRITE_XMP=1 build option. This means that ISO 21496-1 multi channel gain maps are supported, but also means that legacy XMP metadata isn't generated. In order to generate XMP metadata use older image such as miikah/libultrahdr:v1.5.1