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has re-signed chapter 6 all the
luminosity mouse in the top portion of
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the spectrum tab as well as the Basic
tab are made using the composite RGB
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channel as the starting point to their
most useful in targeting adjustments
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based on pixel brightness sometimes it's
useful the target adjustments based on
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color as well as pixel brightness the
colored border buttons at the bottom of
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the spectrum tab create mass in the
channels panel that take color into
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consideration the red green and blue
toggle buttons on the left used the
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corresponding RGB color channels as the
starting point for creating luminosity
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masks the multicolored toggle buttons on
the right create masks using Photoshop's
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color range down to create the initial
mask which makes it possible to target
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specific colors with less luminosity
based feathering on the left the color
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borders indicate which channel is used
as the starting point
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read for the red channel green for the
green channel and blue for the blue
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channel the lighter colored buttons
create a series of five lights masks and
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the darker colored button creates a
series of five dark Smith's the channels
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have names that describe both the
initial channel used and whether it's a
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light or dark series from that channel
either toggle buttons clicking them a
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second time will remove the
corresponding channels from the channels
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panel sometimes you'll find that
different areas of an image have similar
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to nowadays even though they're
different colors for example the
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standard lights mask for this image
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don't do a good job of separating
adjustments between the sky and the rock
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because the tonality have both the sky
and the rocker fairly similar but if we
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generate the mass from the red channel
we can see that the rock is lighter in
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the channel in the sky and therefore we
can find a mask that may do a good job
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of separating adjustments between the
rock and the sky it looks like this red
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lights number to mask my do the job so
with that mask highlighted I can either
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control or command click on the channel
or I can click the load channel as
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selection icon at the bottom and then
with that selection loaded I can create
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a levels adjustment layer and then make
a levels adjustment through that mask
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and it seemed able to do much more
adjusting to the rock then I am to the
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sky because that mask is targeting
adjustments more to the rock into the
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blue in the sky by the same token if I
want to make adjustments to the sky and
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not the rock I might use the blue lights
masks and yes from the blue channel like
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the blue number two
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does a much better job of targeting
adjustments to the sky and not the rock
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each of the six buttons on the bottom
right of the spectrum tab also creates a
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five-match series of channel mass based
on the buttons border color red green
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blue cyan magenta yellow however instead
of using one of the RGB channels is the
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starting point
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Photoshop's color range dialogue is used
to create the initial mask on a
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luminosity masks because it's not based
on pixel brightness color range provides
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a very effective way to target and
isolate specific colors once the initial
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sixteen-bit color range mask is made the
luminosity mass processes used to
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generate the other mass in the series
each having a wider range of selected
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pixels
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you'll notice that the color range
process creates less feathered
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selections so the master generally less
gray and more black and white the
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luminosity masks many nature photographs
not contain a lot of these pure colors
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which can be selected by the color range
command so the higher number mass may be
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the only ones that show much of a
selection if any if I wanted to target
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adjustments to the red and blue areas of
this image like I did previously but
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using the color range mass here's what
that might look like I'll start with
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some red masks to target adjustments
toward the red portions of the image may
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be the red color range for and I'll make
a levels adjustment with that
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not bad
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and then a look at the blue color range
mass and select one of the blue color
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range for download that for this I make
a selective color adjustment and with
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that said to the neutrals I can then
work just in the blues of the sky
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because that's where the mask is
targeting the adjustment and I can
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adjust the selective color of that and
also work with the darkness of that to
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make this guy adjustment
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so for a lot of adjustments that you may
want to make in Photoshop the standard
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RGB luminosity mass will do a great job
but for situations where you really want
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to target adjustments to a specific
color even though the luminosity values
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or tones of that color may overlap with
other colors in the image the color
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based mask but that you find at the
bottom of the spectrum Ted can be really
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helpful