Susan said.......One thing I did not say about the colored shadows that appear in my jewelry photography
Shadows are usually coloured - but our brains choose to ignore that
fact. Also, interestingly, they be either of the object colour or of
its opposite (complementary) colour. They are almost never ‘grey’ as
we tend to think of them. If you want to think of the two
possibilities let us imagine a red bowl standing on a white surface.
Whilst some of the shadow will be due to light simply being obscured
by the bowl, there will also be light reflected from the white
surface up onto the underside of the bowl and re-reflected back down
from there to colour the shadow. If the surface were coloured, this
would also have a modifying effect. Probably the most graphic
example of this is seen when watching snooker on the TV - all the
balls will be seen to have green undersides reflected from the green
baize and, of course, part of this is re-reflected back down into the
shadow. In other circumstances, the shadow will be mainly the
complementary colour due to the main colour having been absorbed out
of the white light. You will normally see this mainly in portrait
paintings where the shadows of the face are normally portrayed in
purple or green (the complementary colours of yellow and red). If you
try to paint the shadows as grey, the face will just look dirty and
not ‘right’. Our eyes and brains delight in playing tricks on us
which we do not normally recognise but, in this case, by changing the
way in which we see the object from a ‘normal’ 3D image to a flat
photograph also changes the way we see and understand what is there.
Best wishes,
Ian
Ian W. Wright
Sheffield, UK