Abstract: Color transformation apparatus (201) for calculating resultant colors (R2, G2, B2) of pixels of an output image for a display with a display peak brightness (PB_D) starting from input colors (R,G,B) of pixels of an input image first image peak brightness (PB_H) which is different from the display peak brightness, said color transformation apparatus comprising: a color transformation determination unit (102) arranged to determine a color transformation (g) from color processing specification data (MET) comprising at least one tone mapping function (CC) for at least a range of pixel luminances received via a metadata input (116), which color transformation specifies the calculation of at least some pixel colors of an image having corresponding to its maximum luma code a second image peak brightness (PB_L), which is different from the display peak brightness (PB_D) and the first image peak brightness (PB_H), and whereby the division of the first image peak brightness by the second image peak brightness is either

Abstract: Because we needed a new improved and very different color encoding space for being able to faithfully encode the presently emerging high dynamic range video for good quality rendering on emerging HDR displays such as the SIM2 display, the video encoder (300) with an input (308) to obtain a video from a video source (301) wherein pixel colors are encoded in an (XYZ) color encoding, the video encoder comprising an opto-electronic conversion unit (304) arranged to convert the luminances (Y) of the pixel colors into lumas (Y?) with a predetermined code allocation function (F), characterized in that the video encoder comprises a chromaticity determination unit (310), which is arranged to encode chromaticities (u?,v?) of pixel colors with lumas (Y?) below a predetermined threshold luma (E?) with a mathematical chromaticity definition which yields a maximum encodable saturation (S_bL) for a particular hue for pixel colors with a luma below the predetermined threshold luma (E?) which is lower than a maximum encodable

Abstract: Because we needed a new improved and very different color encoding space for being able to faithfully encode the presently emerging high dynamic range video for good quality rendering on emerging HDR displays such as the SIM2 display, we present around that new color space various new decoders which allow simplified processing, in particular the handling of all achromatic direction (i.e. luminance) optimization separate from the chromatic processing, and increased quality of the reconstructed HDR images. This is realized by a video decoder (350) having an input (358) for receiving a video signal (S_im) transmitted over a video transmission system or received on a video storage product, in which pixel colors are encoded with an achromatic luma (Y?) coordinate and two chromaticity coordinates (u?,v?), the video decoder comprising a scaling unit (356) arranged to transform the chromaticity colors into a luminance-dependent chrominance color representation, by scaling with the achromatic luma.