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be using this image for this being a
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medium format image it's like 9,000 by
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six thousand something like that if I
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need to use this for print publication
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and up down sampling it three times over
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well I mean it's but you know if I
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introduce a little bit of grain or a
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little bit of you know quality reduction
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probably not going to be noticeable in
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the end result if we're going to be
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blowing this up to the size of a large
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poster or a billboard then certainly
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becomes an issue so we can use this to
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target certain luminosities and of
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course this can be used in combination
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with any of the adjustment layers we're
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going to use in this course and you know
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the same thing applies for the
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highlights if we want to kind of taking
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things out of highlights we can do that
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using this slider once again splitting
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it to feather it out
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now the other option is to create
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something like this where we we target
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luminosities using channels so within
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the channels tab we effectively have the
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red green blue channel if we actually
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click down on these individual channels
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it's just not make a selection though so
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clicking down these individual ones we
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see that the extent of how much red is
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essentially showing through based on
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this mask so you can think of these as
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masks that are allowing certain amount
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of red green or blue through and so when
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we pick our our channel to use it kind
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of depends on what our purposes
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generally speaking red will show you
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know white in any areas where there's a
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lot of skin tone so it's generally kind