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all of the luminosity mass we've been
using so far are generated from the RGB
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channel which incorporates the combined
luminosity values from all three color
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channels for general luminosity
adjustments in an image this is usually
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the best choice but each color channel
reveals a different set of luminosity
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values
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the red channel will create mass more
shifted toward red and yellow colors the
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green channel more towards the green
colors and the blue channel more towards
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the Bleus if you want to make brightness
or contrast adjustments to a part of the
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image with a specific color range like a
blue sky for example in a mask made from
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the blue color channel might do the best
job also if you want to adjust the hue
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saturation or vibrance of a certain
color than a mask made from one of the
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color channels might do the trick
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this set of colored buttons mix mass
from the different color channels
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another option for color base
adjustments is to use a color range mask
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which you can generate from this set of
colored buttons these masks are not
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actually luminosity masks instead of
being generated from luminosity values
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are based on image color using coloring
selections
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more on that later for the first example
I want to work with both the blue and
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orange portions of the sky but I like to
have control over each color area
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separately based on experience I know
that the blue color channel will create
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luminosity mass better suited for
adjusting the blue part of the sky and
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the red color channel will create
luminosity mass better suited for
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adjusting the orange part of the sky
let's start with the oranges I'll click
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the lights red button to generate all of
the red channel masks for the lights and
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thus evaluate those I can see that
probably the red lights number two is
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the one that's gonna work best for the
adjustments I want to make to that part
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of the sky there isn't a specific button
on the panel for loading this red lights
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to selection so once they've built in
the channels panel I need to do is
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highlight it and click the load channel
as selection button or hold down CTRL or
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command on a Mac and click on the
channel I want to select now that I have
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that selection loaded I can pick the
kind of adjustment layer that I want to
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go with it in this case I'm gonna pick a
vibrance adjustment layer the soul
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me to use the multiplier blending mode
to darken through that luminosity mask
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and then use the vibrants ladder to
increase the vibrance and also the
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saturation that's leaving things a
little bit flat so I'm also going to
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reload that seemed selection by control
clicking or command clicking on the mask
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that also adding a brightness contrast
adjustment layer and using this to work
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with the brightness and contrast in that
part of the sky as well let's see how it
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looks
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now I can click on the plus minus late
Reds again to subtract all of those late
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red channels out of the channels panel
and now let's look at the light blue
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masks and evaluate those who want to
adjust the blue portions of the sky and
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by the time I get down to the light
three not much is being selected so I
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think that the blue lights number two is
probably the way to go
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so controller comment click on that
channel and then for this im just gonna
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load levels adjustment layer and I want
to darken the blue sky so wanna bring
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over the black slider bit and fine tune
with midterms lighter and I can also
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bring back some brilliant I need to with
the whites later get that just looking
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exactly how I want
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and that's a great set of adjustments
for that sky so he's interesting to see
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what it would look like without the
luminosity mass controlling the
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adjustments so without that mask can see
what that adjustment would look like and
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the same here and the same here so those
luminosity master really doing a lot to
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control where those adjustments go
before we move on I'll just click the
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Clear Channel's button to clear out any
luminosity mass channels that I have in
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the channels panel to good idea to
always do this when you're done working
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on an image in before you save because
those luminosity channels can really add
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a lot to your image file size I use this
image in the old edition of these videos
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but I'm using it again because it does
such a good job of demonstrating how to
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use luminosity masterwork with color
diffused early morning light was just
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brushing the tips of the grass making it
glow but it doesn't show up well in the
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raw file I want to bring out that
saturated glow without over saturating
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the entire image I also want to darken
in deep in the blue sky looking at the
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red green and blue channel mass I can
see that the red mask does the best job
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of separating out the highlights in the
grasses and the blue channel does the
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best job of targeting the sky
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begin with the grasses so let's generate
all of the red lights masks and evaluate
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them and I think the red lights to mask
will do the best job of allowing me to
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increase the saturation in the tips of
the grasses so control or command click
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on it to load that selection and then I
will attach it to a hue saturation
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adjustment layer and then I can tried
dragging up the saturation slider and
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it's having a great effect on the tips
of the grasses but it's also really over
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saturating the
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light areas in the blue sky so I don't
think I want to use the default
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saturation slider instead I'll grab the
targeted adjustment tool and go down in
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select some of those yellow colors and
just pull up the saturation of those
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colors and that really enables those
great tips of the grass has to stand out
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but it's not allowing the rest of the
saturation to be changed and over
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century the entire image next I want to
bring a little contrast in the shadows
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by darkening them so first I will click
on the red lights channel to get rid of
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those lights mass and now when I click
on the red darks button
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to make the dark red channels and I
think the red darks three is going to
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target an adjustment into those shadows
pretty well so controller comment click
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on that and I'll load curves adjustment
layer and then I will drag down the
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curve two ads
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so
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tones down into those shadows
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now let's work on the sky so I'll get
rid of those red darks masks and
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although the blue lights masks and
evaluating those I think the blue lights