A method for decoding a stream coding a standard dynamic range picture, said method comprising: - decoding said stream to obtain a decoded standard dynamic range picture and colour metadata associated in the stream with the coded standard dynamic range picture, wherein the colour metadata comprises at least a maximum display luminance of a mastering display used in mastering a high dynamic range picture from which said standard dynamic range picture coded in said stream was obtained; - reconstructing said high dynamic range picture from the decoded standard dynamic range picture and from the colour metadata, said reconstructing comprising: inverse mapping a luminance component of the decoded standard dynamic range picture using a dynamic expansion function (f -1) to obtain a high dynamic range luminance component, said function being responsive to at least said maximum display luminance, color correcting two chrominance components (C1, C2) of the decoded standard dynamic range picture by scaling each of said chrominance components with a factor (β,β') to obtain two corrected chrominance components, said factor being responsive to at least said maximum display luminance, and obtaining said high dynamic range picture from said high dynamic range luminance component and said corrected chrominance components. - decoding said stream to obtain a decoded standard dynamic range picture and colour metadata associated in the stream with the coded standard dynamic range picture, wherein the colour metadata comprises at least a maximum display luminance of a mastering display used in mastering a high dynamic range picture from which said standard dynamic range picture coded in said stream was obtained; - reconstructing said high dynamic range picture from the decoded standard dynamic range picture and from the colour metadata, said reconstructing comprising: inverse mapping a luminance component of the decoded standard dynamic range picture using a dynamic expansion function (f -1) to obtain a high dynamic range luminance component, said function being responsive to at least said maximum display luminance, color correcting two chrominance components (C1, C2) of the decoded standard dynamic range picture by scaling each of said chrominance components with a factor (β,β') to obtain two corrected chrominance components, said factor being responsive to at least said maximum display luminance, and obtaining said high dynamic range picture from said high dynamic range luminance component and said corrected chrominance components. inverse mapping a luminance component of the decoded standard dynamic range picture using a dynamic expansion function (f -1) to obtain a high dynamic range luminance component, said function being responsive to at least said maximum display luminance, color correcting two chrominance components (C1, C2) of the decoded standard dynamic range picture by scaling each of said chrominance components with a factor (β,β') to obtain two corrected chrominance components, said factor being responsive to at least said maximum display luminance, and obtaining said high dynamic range picture from said high dynamic range luminance component and said corrected chrominance components.