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Full range HDR support

Mirco Miranda requested to merge mircomir/kimageformats:hdr_support into master

EXR, HDR, JXR and PFM formats support High Dynamic Range images (FP values grater than 1).

In summary, here is the list of changes:

  • EXR, HDR, JXR and PFM: When working with FP formats, the clamp between 0 and 1 ​​is no longer done.
  • EXR: Removed old SDR code and conversions. Due to the lack of a QImage Gray FP format, Gray images are output as RGB FP (recently added code for Qt 6.8 has been removed).
  • PFM: Due to the lack of a QImage Gray FP format, Gray images are output as RGB FP.
  • HDR: Added rotation and exposure support.

With this patch, EXR, JXR, HDR, PFM behave like Qt's TIFF plugin when working with FP images.

Edited by Mirco Miranda

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