The ES-E28 Slide
Copy adapter provides a means to digitise 35 mm slides by fixing them
to the front of a Coolpix camera and photographing them.
However, when photographing a colour negative, the
image is not in fact a simple inversion of a positive, but includes
an orange/red colour cast. This nature of this colour cast depends on
the film type and processing method.
Therefore, although a positive image can be produced from a negative,
for example by the "Invert" command within Photoshop, the
result will not resemble a positive print as it is simply an
arithmetic calculation which maps level 0 to 255, 1 to 254, 2 to 253:
in other words, the image is simply numerically reversed about the mid
point of level 128.
There are some sophisticated software tools (such as
Silverfast DC) which claim to be
able to reconstuct a positive image from a negative film that has been
digitised in this manner.
Colour transparencies and black and white film do
not suffer from this effect and may be reproduced without such
considerations or problems.
 |
A colour negative as photographed by using
the ES-E28 and Coolpix 990 |
 |
The result of inverting the image using the
Photoshop
"Image:Invert" command |
