I am trying to produce a pale blue image as a background to a colour document. Using various graphics editors I have taken the original dark blue image and made it progressively more pale. The image when printed remains blue down to a certain point, but if I make the image paler, the printed background becomes light green.
If I use a black original the grey background produced also eventually turns green when printed as a colour image. The only workaround I have found is to print the background in greyscale then overprint the document however I would prefer a blue background.