Apparatus comprising: an encoder configured to encode a video signal captured from a camera; and a low-light enhancement module configured to perform a low-light enhancement on the video signal in a colour space comprising two colour channels representing colour and an achromatic channel representing light level; wherein the low-light 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 said first classification, applying a first low-light processing to at least one of the colour channels comprising de-noising the at least one colour channel and/or increasing quantization coarseness on the at least one colour channel to reduce a number of bits incurred by colour when encoded by the encoder, such that an increased number of bits is spent on the achromatic channel when encoded by the encoder; and wherein the low-light enhancement module is configured to determine a measure of a light feature from the captured video signal, and a measure of a noise feature from the captured video signal, wherein the light and noise features define a two-dimensional light-noise space, the first classification is a noise classification based on a first combination of the light and noise features, and said combination comprises a one-dimensional noise metric which is a linear combination of the light and noise features that takes into account both light and noise, said noise classification being based on said one-dimensional noise metric; and wherein the low-light enhancement further comprises: detecting a second classification indicative of the video signal being captured in low light, the second classification being a low-light classification based on a second combination which is a linear combination of the light and noise features different than the first combination; and in response to detecting the second classification performing a second low-light processing different than the first low-light processing, wherein the second low-light processing comprises warming a colour temperature of the video signal. an encoder configured to encode a video signal captured from a camera; and a low-light enhancement module configured to perform a low-light enhancement on the video signal in a colour space comprising two colour channels representing colour and an achromatic channel representing light level; wherein the low-light 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 said first classification, applying a first low-light processing to at least one of the colour channels comprising de-noising the at least one colour channel and/or increasing quantization coarseness on the at least one colour channel to reduce a number of bits incurred by colour when encoded by the encoder, such that an increased number of bits is spent on the achromatic channel when encoded by the encoder; and wherein the low-light enhancement module is configured to determine a measure of a light feature from the captured video signal, and a measure of a noise feature from the captured video signal, wherein the light and noise features define a two-dimensional light-noise space, the first classification is a noise classification based on a first combination of the light and noise features, and said combination comprises a one-dimensional noise metric which is a linear combination of the light and noise features that takes into account both light and noise, said noise classification being based on said one-dimensional noise metric; and wherein the low-light enhancement further comprises: detecting a second classification indicative of the video signal being captured in low light, the second classification being a low-light classification based on a second combination which is a linear combination of the light and noise features different than the first combination; and in response to detecting the second classification performing a second low-light processing different than the first low-light processing, wherein the second low-light processing comprises warming a colour temperature of the video signal.