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in this chapter I'll do my best to
explain the basics of what luminosity
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mass are and what they do
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initially I had a hard time
understanding and using luminosity masks
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but eventually I realized that
luminosity masur simply another way of
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creating selections in master control
image adjustments as I mentioned in the
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previous chapter Photoshop owes its
advanced capabilities to its system of
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layers selections and masks very good at
using layers selections in master
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control image adjustments in luminosity
master simply an extension of what you
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already know how to do let's begin with
a quick review of selections masks there
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are many ways to create selections in
Photoshop and there are two basic types
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of selections hard-edged elections and
feathered selections I'm gonna use the
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quick selection tool to make a hard edge
selection of the sky the selection lines
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or marching ants show the boundary of
that selection entire sky is selected
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and the entire landscape is not selected
by quickly plus minus few button on the
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Tiki Actions panel I can view a red
overlay of that selection inside the
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selected area the red color shows that
everything there is a hundred percent
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selected and outside the selection
everything is 0% selected the selection
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lines are the actual boundary of that
selection in the last chapter I have
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mentioned that selections in master
directly related with a live selection
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is loaded like this one and a layer mask
is generated for example if I make it
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curves adjustment layer that selection
is now imprinted into the mask the mask
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is now white inside the selected area
and black outside the selected area
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white in a mask reveals an adjustment
and black conceals in this case if I
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make a Curves adjustment the adjustment
is restricted to the sky with a hard
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edge by the mask we can make a selection
into a mask and we can also make a mask
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into a selection so if I hold down CTRL
or command on a Mac and then click on
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the mask it will load that Sky selection
this is currently still a hard edge
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selection but if we refine this election
and feather it can become a feathered
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selection let's view it that selection
looks like as you can see some of the
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images still hundred-percent selected in
some of it is 0% selected but now we
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have a feather transition pixels in the
transition zone range from a hundred
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percent selected down 20 percent
selected confederates elections the
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selection line indicates the threshold
where pixels are 50% selected pixels
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transition to a hundred percent selected
inside the line and 0% selected outside
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the line with a feathered selection even
though we see a selection line there are
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partially selected pixels both inside
and outside that line by now make
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another curves adjustment layer that new
selection will be imprinted onto the
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mask we can see that that mask as a
feathered edge while the initial mass
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caddy hard edge white still reveals an
adjustment and black still conceals an
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adjustment but the gray tones in the
feather transition area will partially
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revealed or conceal an adjustment 50%
gray in a mask would reveal or conceal
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depending on how you look at it
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50% of an adjustment with the feathered
mask occurred suggestion is still
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centered on the sky but its feathers in
both directions from the skyline RGB
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images in Photoshop are comprised of two
components color and brightness each
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pixel has a color value which is
determined by the proportions of red
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green and blue it contains and
brightness or luminosity value's
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somewhere in between black and
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the channels panel shows us the three
color channels red green and blue the
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three color channels are combined
together to make the full color RGB
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image
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the color channels don't actually have
any color in them each channel is it
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tone map of the luminosity values for
that color and each color channel
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contains different tonal values areas in
the red channel which are lighter
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contain more red in the color image like
the rocks and there is in the blue
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channel which are later like the sky
contain more blue color in the image
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here is that appears light in all three
channels like the clouds contain a lot
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of all three colors which relates to
brighter or water colors in the image
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areas that appear darker in all three
channels contain very little of all
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three colors and this relates to darker
or blacker areas in the image so any
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image can be broken down into color and
luminosity values the luminosity values
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are black white and all the shades of
gray in between as we already saw layer
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masks are also composed of white black
and shades of grey if we make a
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selection of the luminosity values in
the image from one of the channels and
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then generate a mask just like before
the selection will be imprinted into the
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mask and that is how you get a
luminosity mask but luminosity master
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unlike other masks they match the
details in the image pixel for pixel and
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the transitions are invisible because
they sell feather around the images
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tones there at the same time precise
like a hard-edged mask and gradual like
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a feathered mask to demonstrate let's
load a selection of the blue channel I'm
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choosing the blue channel because the
sky is lighter in the land is darker so
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this will target the adjustment more
towards the sky
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so now I can create a Curves adjustment
layer and that curves layer mask is
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imprinted with the luminosity selection
now wanna make a Curves adjustment the
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luminosity mask targets that adjustment
to the sky
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but it matches the image and feathers
into the image perfectly so no selection
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edge or halos are visible to see the
effect of luminosity mask is having you
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can hold down the Shift key and click on
the mask to disable it and you can see
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how much darkening that adjustment would
do to the landscape if we were using
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that luminosity mask so those are the
fundamentals of what luminosity mass are
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and what they can do i luminosity
selections in mass have limitless
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possibilities and can guide adjustments
in ways no other method can they are
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always the right tool for the job
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many adjustments are still suited to
simpler hard-edged or feathered masks
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success with luminosity selections in
mass requires knowing when to use them
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and how to combine them with other
methods of making selections masks