I am looking at blueprints that are pdf files. The files were originally created by a CAD program and then "printed" to Adobe. The author added blue colored hatching in some of the areas of the prints which covers important data. Is there a way to remove or hide these blue lines?
I know the data exists under the blue lines because as the image loads, the underlying image is visible first, then the hatch lines load like an overlay on top.
I am currently using the free Adobe Reader.