i could not find a document on removing watermark demo, Image, anyone has one

If you're talking about the watermark Adobe adds to PDFs then you need to buy a licence.

Or switch to Lucee.

Not pdf I am talking about the images

what images - what watermark? Honestly it's very hard to guess what you are asking!

Ok I created a text and used cfimage to watermark my image Now I am exploring if I remove the watermark from the same image or not I could not find any link But second thought comes into my mind is just replace the image

OK - you can not remove a watermark from an image once created - it is part of the image - there are no layers or anything once it's saved.