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- [Voiceover] Now, the truth
of path finder operations

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is they're a little long in the tooth.

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They were originally
introduced in Illustrator five.

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And the guys at top, these
so-called shape modes,

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they've been upgraded over
time but the others have not.

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And as a result, they're a
little finicky sometimes.

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They tend to really like filled, closed,

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path outlines, so filled shapes.

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So notice here that we have
these daggers and double daggers

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following the names of
some of these operations.

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The dagger means the
operation is incompatible

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with unfilled paths, and
the double dagger means

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that it has problems with open paths.

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And so as you can see, trim all the way

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through outline, have problems with both.

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Divide has a big problem with open paths.

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But minus back has no problems at all

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and neither do that fab
four up here at the top.

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So, just to give you a sense
of what I mean by all this

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I'll just go ahead and zoom
in on my unfilled paths,

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and I'll marquee both of these
guys here so they're stroked,

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they're not filled, they
are closed path outlines.

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So it's the same square and ring

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that we had before, just without a fill.

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And now, I'll go ahead and
click on a representative

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path finder trim, and as you
can see, I get an error message

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telling me this path finder
operation requires filled paths.

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And that's the same error message

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you're gonna get from merge as well.

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Crop will work, technically,
but it doesn't do

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what it's supposed to,
notice that it ends up

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giving us back two circles,

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and if I ungroup them by
pressing Control Shift G,

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or Command Shift G on the Mac,
and then just tap the D key,

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you can see what we
have is a compound path

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with a circle inside of it but
it's no longer a live shape.

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So we just kinda wrecked
the path outlines.

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Alright, so I'll just
go ahead and undo back.

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I'll be doing a lot of undoing here.

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Next comes outline, which
does its job except for the

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fact that it just gets rid of the strokes.

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So if I were to tap the D key, we can see

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that everything's here, and
I could pick it apart too,

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by pressing Control Shift G
or Command Shift G on a Mac,

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and then just start
dragging these guys apart,

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and so you can see, we still
have the separated paths

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just like we did before, it's
just that we lost the strokes.

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So it's not terrible, just a
little bit of inconvenience.

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Alright, I'll go ahead and undo that again

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in order to put things back together.

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And let's try out divide,
which works exactly

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as it's supposed to, by the way,

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and so, if I was to press Control Shift G

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or Command Shift G on a Mac, in order

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to ungroup these shapes and
start moving them apart,

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you can see that they are
indeed the shapes we were

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looking for, and of course we have

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Mr. Negative Space as well.

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Alright, we'll go ahead
and undo all the way back

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till we get the original shapes,

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and I'll just demonstrate very quickly,

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that minus back works exactly
as you'd hope it would,

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and so do, if I press Control
Z or Command Z on a Mac,

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so do all of the shape modes,

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including, for example,
unite, works just great.

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Alright, now let's check out
what happens with open paths,

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if I go ahead and marquee these guys,

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both of which are open, as you can see.

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Both trim and merge are gonna

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do the same things we saw before.

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Crop is gonna result in a similar failure

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to what we saw before as well.

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And then outline is gonna
do its standard thing

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where it divides all the lines

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but it throws away the strokes.

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The one that behaves very
strangely in this case,

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differently than we saw
with unfilled paths,

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is divide, which just plain fails.

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And so you can see here,
even if I marquee this region

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all I get is these two
path outlines right here.

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So there's not a bunch of hidden stuff,

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or anything like that, it's just that

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the operation doesn't perform
the way it's supposed to.

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However, if I go ahead
and undo that, you can see

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that minus back works just great except

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it does deliver a closed path outline.

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That's the thing to bear in mind.

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So anytime you apply minus
back or any of the shape modes

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to unfilled path outlines,

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they will deliver closed path outlines,

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which I can also demonstrate
by clicking on unite,

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which produces this very
interesting effect, right here.

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So, just be aware that many
of the path finder operations

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do not work with unfilled
or open path outlines.

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And, if you want my summary
here, this would be it.

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My favorite path finder
operations, the ones I use

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on a regular basis, are unite
through exclude, up here

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in the top row, as well
as divide and minus back,

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which are the first and last
icons in the bottom row.

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With the one caveat being that divide

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is not gonna serve you well
with open path outlines.

