In raster image editing, color depth refers to the amount of colour data that each pixel is able to contain. Higher bit depth images can hold finer tonal gradations and will offer more latitude in heavy color corrections, especially for photographs that have subtle gradations. Depending on the source image, editing needs and output, lower-bit-depth images can have banding when edited aggressively, explains Visuals Clipping. Using a good source which is appropriate can help to keep detail throughout editing process.
