I have an art print from the early 90s I'd like to archive digitally. It's in colour and is printed on a magazine-like paper. The trouble is that the paper mainly has a matte finish, except there's a watermark-like pattern of the title on the background, in a glossy finish. Otherwise, the colour is the same, so you only see that pattern at certain angles or when moving the print.
I'm not sure if I'm explaining it ideally, but you are it sometimes on book covers and packaging, where most of the surface will be matte but the title, product label, etc, would be glossy. Usually, that's accompanied with a contrasting colour as well, but in this case the glossy pattern is the same colour.
I've scanned the image, and that watermark is basically invisible in most areas - I can see it very faintly in areas where I suspect the paper was warped away from the scanning platen, but it's not enough contrast to catch with Photoshop's magic wand tool to bump up the contrast manually.
Anyway, I've tried searching for ways of getting this to show a more prominently but I generally find ways of reducing paper textures instead (i.e. scanning a second time upside down, then overlaying), which seems to be the opposite of what I'm looking for.
Any tips would be appreciated. Thanks in advance!