Colour conversion

Colour conversion comprising: mapping pixels of an input image in an input colour space to pixels of a mapped image in a different output color space; processing the mapped image by detecting any mapped pixels that have negative colour components and for each mapped pixel with negative colour components, increasing all the colour components of that pixel by the magnitude of the largest negative colour component for that pixel; generating pixels of an output image in the output colour space from pixels of the processed mapped image; wherein colour components of the pixels in the output image are inhibited from exceeding a maximum representable colour amount. Scaling may limit the colour range depending on the largest colour component of a pixel. Gain and offset may be applied to all colour components of a pixel. Pixel luminance may be detected and a knee curve mapping applied. Colour transformation may be performed in a camera. The invention may help prevent undesirable changes in hue, brightness, luminance and saturation by avoiding truncation or clipping of the colour gamut.