Re: (Fwd) Infrared Photographer wanted

[Wayde Allen <allen@xxxxxxxxxxxxxxxx>]

On Fri, 23 Jan 1998, Jason Revell (in5) wrote:

> So what I would recommend would be to take a photograph under IR and
> see what shows up.  If however this shows up nothing, not give up as
> the pigment used could well show light on the grips.  If this were the
> case
> try taking a UV picture and that might help.
> 
> I hope this helps, If you would like any further help with this type of
> photography
> (IR or UV) please let me know, as teach the Photography to Fine Art
> Conservation students using these very methods.

I agree with your suggestions, and would like to add another possible
technique.  I've made use of reflective polarization to make photographs
of carved text in gravestones.  Basically, a reflective surface tends to
polarize light.  By putting a polarizer on the camera lens, and using a
very direct light source you can set the polarizing filter on the camera
to cancel the polarized light reflected from the surface.  The carved
pattern presents a different angle of reflection to the light, and hence
produces a different angle of polarization.  This increases the contrast
between the base material and the carved surface. Further enhancement
might be possible by scanning the resulting image, and processing it with
an edge detection filter.

- - Wayde
  (wallen@xxxxxxxxxxxxxxxx)

*
****
*******
******************************************************
*  To remove yourself from this list, send:          *
*         UNSUBSCRIBE INFRARED                       *
*       to                                           *
*         MAJORDOMO@xxxxx                            *
*----------------------------------------------------*
*   For the IR-FAQ, IR-Gallery and heaps of links:   *
*  http://www.a1.nl/phomepag/markerink/mainpage.htm  *
******************************************************

------------------------------