You can convert one ore more pages to greyscale.
For example, the document contains images with a [Colour space] other than [RGB], [CMYK] or [Greyscale]. You cannot edit these images. When you convert the pages with the images to greyscale, you can edit the images.
Colour images can be converted to greyscale images. Greyscale images are also known as black-and-white images. Such images are composed exclusively of shades of grey, varying from black at the weakest intensity to white at the strongest.
Select one ore more pages.
The file may contain a mix of CMYK, RGB or spot colour objects.
Click [Pages] - [Convert to greyscale].
The selected pages are converted to greyscale.