[Gimp-user] tool affect all layers?

[Helen]

In attempting to make photos look as though they are on the pages of a book,
I have an image with  ten layers.  I'd now like to use the curve/bend tool
to make
the book "sink" in the middle (spine).  Must I flatten the image in order
for the tool
to affect all ten layers?
Thanks,
Helen, using Giimp 2.2.10


-- 
using Linux, SuSE 10
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