FIELD: electrical communication engineering.
SUBSTANCE: invention relates to providing improved secure high dynamic range image or video transmission. Image transformation apparatus is arranged to derive a high dynamic range image (HDR_PRED) from a low dynamic range image (LDR_CONT). Derivation comprises tone mapping of lumas of pixels in the low dynamic range image into lumas of pixels of the high dynamic range image by applying a predefined mapping algorithm (gam). Image transformation apparatus comprises input (204) to data delivery system (205) comprising the low dynamic range image, data-secured input (206) to the predefined mapping algorithm (gam) data and control unit (202) arranged to manage access to the predefined mapping algorithm data under control of an owner of artistic content in the low dynamic range image.
EFFECT: technical result is higher protection of content from unauthorised copying.
16 cl, 2 dwg
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