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the last section and our first steps
called the subtraction mask area so what
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we can do here which is really cool is
create our own mess so far not happy
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with the masks that we've been able to
get out of the top Perry year olds in
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the total area of masks we can now
create our own so simple as choosing one
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from the left so our starting point we
choose one so this this example I'm
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gonna choose lights one that we choose
one from the right side which we want to
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subtract so let's say we want to work on
middle great whites but we don't want to
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go all the way to your white which we
get with lights one with likes to we
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wouldn't get the middle great way to get
the top 25% what's all the way to all
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the way to peer white but we want to
work on the middle area but we don't
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want to work on the areas to the right
so what we're gonna do is we're going to
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subtract from that our lights 305 select
lights for a and we just look at both of
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those masts here we've got everything
from Middle great appear white here
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we've got everything for top 12 percent
to clear white if I subtract now this
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mess from this mask all be working on
the middle gray area to the top 12 and a
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half percent of whites and not working
on the top and a half percent therefore
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no risk slipping my highlights so all I
need to do now that I've selected both
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of those expressed the execute button
and what that's done as of slowed up my
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new selection at all I do from there is
decide what I want to do with it so far
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why create a Curves adjustment layer
just select my curves
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now a look at that mask its selecting
like I said everything from middle grade
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to the top 12 and a half percent but
nothing that we've created our own
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special mess we can do that now in our
lights are dark
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and all of our colors so we have now our
own creative control over the types of
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mass that get created rather than the
ones that have been selected for us so
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we can virtually select any tonal area
within our images now by creating our
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own subtraction mass of these can be
take a while to get used to using if you
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haven't haven't used them before haven't
quite got your head around how these
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masts quite work but once you do you'll
find yourself using this section on a
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regular basis