1. A method for encoding high-dynamic range images with a processor, the method comprising:receiving a high dynamic range (HDR) image;
generating a tone-mapped image based on the HDR image;
generating a luminance ratio image based on pixel luminance values of the HDR image and pixel luminance values of the tone-mapped image;
determining residual chroma values based on the luminance ratio image, the HDR image and the tone-mapped image;
generating a log ratio image based on the luminance ratio image; and
generating a coded HDR image, the coded HDR image comprising the tone-mapped image and HDR reconstruction data, the HDR reconstruction data being derived based the log ratio image and the residual chroma values.