A color transformation apparatus to calculate resultant colors (R2, G2, B2) of pixels of an output image (IM_MDR) for a display with a display peak brightness (PB_D) starting from linear input colors (R,G,B) of pixels of an input image (Im_in) having a maximum luma code corresponding to a first image peak brightness (PB_IM1) which is different from the display peak brightness, wherein the color transformation apparatus comprises: - a color transformation determination unit arranged to determine a color transformation (TMF; g) from color processing specification data (MET_1) received via a metadata input, said color processing specification data (MET_1) comprising at least one tone mapping function for at least a range of pixel luminances, said color transformation specifying the calculation of at least some pixel colors of an image (IM_GRAD_LXDR) having a maximum luma code corresponding to a second image peak brightness (PB_IM2), which is different from the display peak brightness (PB_D) and the first image peak brightness (PB_IM1), and whereby the division of the first image peak brightness by the second image peak brightness is either larger than 2 or smaller than 1/2; characterized in that the color transformation apparatus further comprises: - a scaling factor determination unit arranged to determine a resultant common multiplicative factor (gt), comprising: - a capability metric determination unit arranged to determine a metric for locating positions of display peak brightnesses between the first image peak brightness (PB_IM1), and the second image peak brightness (PB_IM2) and outside that range, and - a resultant multiplier determination unit arranged to determine from the display peak brightness (PB_D), the metric, and the color transformation the resultant common multiplicative factor (gt); and wherein the color transformation apparatus further comprises - a scaling multiplier arranged to multiply the input colors with the resultant common multiplicative factor (gt) to obtain the resultant colors (R2, G2, B2). - a color transformation determination unit arranged to determine a color transformation (TMF; g) from color processing specification data (MET_1) received via a metadata input, said color processing specification data (MET_1) comprising at least one tone mapping function for at least a range of pixel luminances, said color transformation specifying the calculation of at least some pixel colors of an image (IM_GRAD_LXDR) having a maximum luma code corresponding to a second image peak brightness (PB_IM2), which is different from the display peak brightness (PB_D) and the first image peak brightness (PB_IM1), and whereby the division of the first image peak brightness by the second image peak brightness is either larger than 2 or smaller than 1/2; characterized in that the color transformation apparatus further comprises: - a scaling factor determination unit arranged to determine a resultant common multiplicative factor (gt), comprising: - a capability metric determination unit arranged to determine a metric for locating positions of display peak brightnesses between the first image peak brightness (PB_IM1), and the second image peak brightness (PB_IM2) and outside that range, and - a resultant multiplier determination unit arranged to determine from the display peak brightness (PB_D), the metric, and the color transformation the resultant common multiplicative factor (gt); and wherein the color transformation apparatus further comprises - a scaling multiplier arranged to multiply the input colors with the resultant common multiplicative factor (gt) to obtain the resultant colors (R2, G2, B2). - a scaling factor determination unit arranged to determine a resultant common multiplicative factor (gt), comprising: - a capability metric determination unit arranged to determine a metric for locating positions of display peak brightnesses between the first image peak brightness (PB_IM1), and the second image peak brightness (PB_IM2) and outside that range, and - a resultant multiplier determination unit arranged to determine from the display peak brightness (PB_D), the metric, and the color transformation the resultant common multiplicative factor (gt); and wherein the color transformation apparatus further comprises - a scaling multiplier arranged to multiply the input colors with the resultant common multiplicative factor (gt) to obtain the resultant colors (R2, G2, B2).