I understand better.
What is visible is really a flattenned stack of the visible layers
(with an eye in the Layer dialog).
Not exactly flattened but merged
Flatten will a remove the alpha channel, replacing any transparent area
with the background color
The question is the interest of this command.
Alexia, please, could you detail your example?
well i can not reply for Alexia but i may give a example.
On a hypothetic image add a duplicate layer on top in Overlay mode give me
excellent result to enhance details and contrast on some area
But terrible result on others
On the other hand a similar process but in Multiply mode will do the opposite
,improving that part (i.e under-saturated and too pale sky and clouds)that
overlay mode will screw up ,but worsening the rest,
with NEW from visible i may save, and then merge the best of both combination
easily
apply new from visible for combination-1,(overlay)
toggle off visibility of that new layer,
repeat the process to save result of combination-2(multiply)
then i may erase with more on less opacity what i do not like on the New merged
top layer and when happy of the combination , save
you will not able to get the same using merge visible layers
once merged will become impossible to recombine the layers in a different
mode,
You may not need that feature
But if you would need it , without NEW from visible,you would need to get
trough 5 no too much intuitive steps instead then a single click
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