Gerard Meijssen wrote:
The point of ND is that it does not allow to change material in such a way that they do not accurately reflect what was originally there. When for editorial reasons a picture is changed, typically there does not need to be a problem. One reason why I would insist on ND is to prevent the barbarism of people changing the colours in art.
While it is important to have an accurate copy of original art as a reference point, I have no problem when a user (in the spirit of Andy Warhol) plays with the colours of a work of art. Sometimes a work of art can be studied better by electronically enhancing certain parts of the spectrum.
Also, not all scans are the same. Poor scanning equipment and software can itself generate distortions of coulour.
Ec