Hi All! Hope this is the right forum for this question!
I have a new potential project coming: Client has several large antique certificates (15"x21" or so) with gold foil seal.
Hoping someone can recommend the best way to capture these. I can either shoot with my Canon 5dmkii or scan with my Epson V700...
I think the real challenge will be the gold foil!! Hope you guys have some suggestions to cut my experimentation down.
From my experience, the best way to light it, if you photograph it, will be indirect (i.e. bounced) illumination: take a large white piece of Fomecore and cut a hole just large enough for your lens to see through and point your lights at this bounce panel. Make sure the subject is evenly illuminated (to within a tenth of a stop) from center to edges and corners.
Keep in mind that like all highly reflective surfaces the gold foil seal will reflect back the color of the light reflecting from it, so if you want to provide a little higher quality product to your client you might want to make two exposures: one with the white bounce panel and a second one with a gold bounce panel - you want to light the gold with gold light to make it look gold - and then combine the two exposures as masked layers in Photoshop using the gold lit one as the background layer and the neutrally lit one as the top layer. You'll make a mask in that top layer to let the gold of the seal come through by painting that area of the mask black. If the effect is too pronounced, paint the mask with a shade of gray instead.
Obviously everything - camera, subject and lighting positions -- should be locked down and make sure sure your camera's sensor plane is parallel with the subject's plane.
My second piece of advice is: try scanning first and see if the results are acceptable to you and your client. If they are you will save a hell of a lot of time and effort.