You will
likely notice that the original image shows a change relative to
the duplicate. Examples of the changes that can occur include the image,
depending upon the profile being used, becoming flat lacking contrast
and/or saturation or hue shifts. It may even take on a colour cast. Each
image will react differently. Although not obvious in
the screen shot I find that in the example shown below the red in
the shadow area (shown inside yellow boundary)
of the boat darkens significantly, the remainder of the image changes
very little.
Photoshop is giving us a very
useful message with the soft proof preview. If all has been configured
correctly and the media profiles being used are accurate, we should see
how the dynamic range and colour gamut of the image is going to be
compressed when printed.
Actually, with profiles for
matt papers the change can be very dramatic. Many have balked at this
point and gave up thinking that something was drastically wrong with
their media profiles. Certainly, the Epson media profiles will tend to
show less than ideal results with images containing saturated greens and
blues.