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the best way to think about layers is
pieces of paper so the moment we have
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one piece of paper with a picture of a
model we can come down the bottom and
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another piece of paper over the top of
it now if we come up to a bucket tool
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and we paint black on a piece of paper
that we have a blank piece of paper over
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the top of the model might just change
this culture here so I can show you a
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few things ok let's make the case I read
by again also another change the color
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game green green piece of paper over the
model we come into the math section and
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firstly we can turn them off when you
see them all here so we ask if I turn
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off the grain layers so we just see the
red layer with a mouse can come down
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here and apply a mosque and the best way
think about the mosque if it's what it
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means it's a solid piece of paper if the
mask is black it means it is see thru
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also ones burning a hole through it so
if I just coming with my brush tool now
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and come onto the mosque and then paint
with black low you'll see a campaign a
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hole through the mosque to see the live
alone if you want to have a look at your
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mask just by holding down your optional
partner and clicking on the mosque
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intellectually show you what youve
painted so there's a mask of cut a hole
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through the red so I can see the model
true it now forgot to the grain layer I
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can then apply a mosque on here came
through in black and convince the some
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red and the model and that's the ages
way to think about
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masks and why is the pieces of paper
over the top and you just burn holes
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through each layer so you can see the
layer below now one of the things that
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mask and I are very useful
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for is making your image non-destructive
which means a novel too much do changes
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to an image say that then come back
later and work on it again and change
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them on and go back to the basis of the
image so what I mean by this is if I
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come down here I'll come up to my just
went and so I put a curve later on I can
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put a curse on to this image and curve
it up and save it off as another attempt
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for appears to back up again with
clients it all that curve was all you
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contrast is too strong you can come back
in and get to that adjustments and
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readjusted again to something maybe a
little more pleasing to the client the
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other thing we can do we can use opacity
to soften off the amount of the effect
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of this series so just by sliding up and
down its just changing how much of that
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effect we want to apply onto this image