Apparatus comprising an encoder configured to encode a video signal captured from a camera, and a low-light enhancement module configured to apply a low-light enhancement to the video signal. The low-light enhancement is performed in a color space comprising two color channels representing color, and an achromatic channel representing light level. The enhancement comprises: detecting at least a first classification indicative of disturbance in the video signal due to capture in low light; and in response to detecting this classification, applying a low-light processing operation to at least one of the color channels to reduce a number of bits incurred by color in the encoding, such that an increased number of bits is spent on the achromatic channel when encoded by the encoder.