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Draft: JXL: preserve HDR data

Mirco Miranda requested to merge mircomir/kimageformats:jxl_hdr_support into master
  • FP16 and FP32 images are saved as FLOAT16 instead of UINT16 thus preserving HDR values.
  • On loading "JxlBasicInfo::exponent_bits_per_sample" is checked to see if the data is HDR or not.
  • HDR images saved with this patch are also loaded correctly by Gimp and Photoshop.
  • Older versions of this plugin load them correctly as UINT16 (obviously losing HDR info).

This is an example of an HDR image: memorial.jxl

Edited by Mirco Miranda

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