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there are times when the feathered
nature the luminosity mask is helpful in
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one part of an image
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but I want the adjustment to be entirely
revealed or concealed
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in another part of the image sometimes
the burn dodge tool can be used to
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quickly customize a mask for this
purpose
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before a show you how to do this I
should point out that this technique
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doesn't work for all images
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and if you are carefully can produce
some up the halos and unrefined mask
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edges
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that luminosity mass are intended to
avoid in future segments I'll be
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demonstrating
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much better and more advanced techniques
for localizing luminosity mask
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adjustments
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but this one can work well in a pinch
and sometimes it's a very simple way to
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go
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in this image I wanted brayton exposure
that dark landscape
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I wanna do this through a darks mask
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the reason I'm using a fairly broad arcs
mask is because
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gonna be lightening through ducts mask
which we now reduces contrast in by
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using the most expanded ducks mask
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have enough tonal range leftover that I
can make a NASCAR
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in my curves adjustment layer to try to
retain contrast as I light
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taken control click on that dark scandal
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and then with that selection active
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cream makers adjustment layer and that
only use a screen
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blending mode to lighten the image
through that mask
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and I can still work with the curve to
introduce the contrast level that i won
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in my just so you can see that
adjustments done a great job
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a break exposure in my landscape but
because they use that fairly broad
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basic darks mask the adjustment is also
bleeding over
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into the sky I really don't want this
guy to be affected by this adjustment at
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all
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so let's turn off this adjustment and
then let's have a look at that ducks
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mask
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and see if I can customize that mask
using the burn tool
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the sky in this mask is already darker
than the landscape
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so the adjustment is being restricted in
the sky to a degree
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luminosity channels like image layers
can be adjusted
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therefore I can use the
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earn 20 set to shadows
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so that it will burn the darker tones an
exposure
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about 65 percent in this case I can
actually burn
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right on the luminosity channel itself
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and i cant darkened that Sky in the mask
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and because I'm darkening with the
shadows setting
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and darkening the darkest areas in the
sky first
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and I'm not darkening the lighter areas
in the landscape
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sewn up customize the Starks mask so
that it will still enable me to
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lighten the dark areas in the landscape
because the sky is black in the mask
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any adjustment will have no effect on
the sky let's give it a try
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or control-click on the new modified
ducks mask
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to load the selection now I'll go back
to the color RGB channel
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and then I'll create a new curves
adjustment layer
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this curves adjustment layer has that
mask
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in which the skies completely black
which will conceal
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any adjustment I'll set the blending
mode to screen
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as before and as you can see where
lightning
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through that dark mask but the skies
being completely left alone
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just as we want and I can use the curve
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to further work with the contrast my
landscape adjustment so
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that adjustment worked much better than
the one
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with two unmodified arcs mask in which
he just knows bleeding over into the sky
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in this case it work to burn the shadows
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in the darkest parts at the darks mask
to customize it
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you could also use the Dodge tool set
the highlights
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to dodge the lightest areas analytes
mask
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and because we have modified the Starks
mask
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we can now generate other masks from
that modified mask
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for example I could intersect this mask
with itself
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and generate mass that would target
darker tones in the landscape
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are still completely concealing any
adjustments in the sky
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I can also control click on the
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modified dark smash
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ask to selected and then type control
shift or command shift
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hi invert that mask
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and then save the new inverted mask
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this new inverted mask is essentially a
lights mask
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which will reveal some degree adjustment
in the lightest portions of the
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landscape
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but because the sky in this mask is
completely white
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any adjustments will be applied in the
sky with full strength
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but see what this looks like go back to
the color RGB channel
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and then create new curves adjustment
layer
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with that selection active that creates
that mask
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and lets said a multiply blending mode
this time
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to darken the sky and like I said is
going also darkened the brightest
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areas at the landscape with that mask
but I can use the curve to further just
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the contrast that adjustment and all
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alt click on the I have the background
layer to turn
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all our adjustments on an often see the
before
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hand after effect have those adjustments
so
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another way to you create a custom
modified mask is to use the burn tool
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to burn the darkness portions of the
darks mask
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or to dodge the brightest portion of the
lights mask
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all this isn't the most refined or
elegant way
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to create localized luminosity mask
adjustments it's quick
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and it's easy and in the right situation
can even work pretty well