That’s because photos shot in monochrome mode save as jpegs, not RAW files, and those contain less information and, therefore, less flexibility for editing.
Most digital cameras make it easy to shoot entirely in black and white by switching to “monochrome mode,” but relying too heavily on this feature can be a mistake if it limits your choices in post-processing. That’s because photos shot in monochrome mode save as jpegs, not RAW files, and those contain less information and, therefore, less flexibility for editing.