Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Digital photos and colour differentiation.
Is it just me, or have you noticed that a digital photo of a section can really show up colour differences that are not so apparent directly?
(welcome to the darkside)

Your camera can record a higher contrast image than you see, especially if you up some of the settings (eg contrast / vividness). However, it is best to do this on the computer with the normal image.
The camera can also see more of the spectrum than your eyes, both at the near infra-red and UV ends.

Sometimes, it is advantageous to remove one or two colour channels (a simple click in Photoshop or equivalent) from an image, eg just using the blue channel if you want stones emphasised in a green landscape:

See the last 3 images on of the Sutton Hoo Excavation in 1985, where Christopher Brooke has heavily tweaked a UV image.
When delineating a site in an aerial photo, realism is less important than seeing what is there. In that respect, some applications of aerial photography are more akin to a geophysical survey.
The image below, by Jim Knowles, is an example of a carefully processed near infra-red image:
[Image: ruffordir210.jpg]

When working outside the visible spectrum, photo realism has no meaning.

Possibly Related Threads...
Thread Author Replies Views Last Post
  Wessex grasp the nettle of non-Digital Photographic sustainability BAJR 47 25,057 7th May 2014, 11:45 PM
Last Post: Marc Berger
  Silbury Hill Digital Archive BAJR 3 3,268 3rd April 2014, 06:12 PM
Last Post: GnomeKing
  Evaluating Digital Dwelling film - a new way to interpret the past. BAJR 13 8,902 15th January 2014, 02:29 PM
Last Post: P Prentice
  Another digital democracy campaign Jack 1 1,815 20th March 2013, 06:42 PM
Last Post: Jack
  digital archaeology - WEA - Nottingham BAJR 3 2,892 11th March 2013, 04:38 PM
Last Post: BAJR
  Heritage Lottery Fund- New digital projects rules Doug 1 1,822 10th November 2012, 08:20 PM
Last Post: Doug
  Digital Disengagement BAJR 44 18,609 26th March 2012, 12:43 PM
Last Post: Jack
  Digital past 2012 BAJR 1 1,954 17th January 2012, 03:53 PM
Last Post: BAJR
  Beginners' guide to digital archaeology Courses BAJR 1 1,949 16th December 2011, 02:17 PM
Last Post: BAJR
  Russia In original colour photographs BAJR 3 2,560 18th November 2010, 02:55 PM
Last Post: gwyl

Forum Jump:

Users browsing this thread: 1 Guest(s)