Colour balance refers to the adjustment in photographic processes that ensures a neutral scale of gray tones is reproduced accurately in a colour image. Proper colour balance corrects unwanted colour casts caused by lighting conditions or camera sensors, ensuring that whites appear truly white and other colours are rendered naturally. Achieving correct colour balance is essential in both film and digital photography, as it affects the realism, mood, and overall quality of the image. Photographers use tools such as white balance settings, colour filters, and post-processing software to maintain accurate colour reproduction and consistent results across different lighting environments.