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- If you've had some experience with color correction,
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you may find that depending
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on the system you're coming from,
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you actually prefer working with curves
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rather than color wheels.
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And that's fine because here in DaVinci Resolve,
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there's a very powerful curves tool called custom curves.
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Both curves and color wheels can be used
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to do the same thing, which is primary corrections.
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We talked about that earlier in this chapter.
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My definition of a primary correction is a correction that
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generally affects almost every pixel in the image.
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They're not targeted.
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We're not just targeting a red shirt
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and changing the red shirt.
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Rather we're changing the black point,
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the white point, the contrast of the image,
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the overall color balance of the image.
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Those are big primary corrections.
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Now curves can be used to make really big corrections
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or very targeted corrections.
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We're going to take a look at using curves
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as a primary correction,
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knowing that you can always add more dots in a curve in
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order to then turn that curve from a big primary correction
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into a targeted secondary correction.
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By default, the custom curves are exposed
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in this curves pallet.
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You'll notice there are a bunch of different curves options.
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We have our custom curves,
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a bunch of Hue versus curves, a Lum versus,
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and two Sat versus curves.
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We'll take a look at some of these later in this training.
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Right now, we're going to stay focused on the custom curve.
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Resolve 17 brought us to what I call
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the gigantor curves.
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Using that expand button,
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you can now have a large curves interface that you can make
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as large as you want,
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especially if you want to do very detailed work,
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or if you want to get into
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a very specific part of the image.
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One of the nice things about curves is it gives you a
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histogram which can be controlled in this options menu.
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So we've got this histogram and it can show you
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what is the histogram on input.
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In other words, before you make any change,
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or does a histogram show you
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after you make your changes, output,
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or you can just go ahead and turn the histogram off.
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Let's go ahead and keep it on output.
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Cause it'll show us the result of our changes.
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Now, the concept on the histogram and in fact,
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I'm going to make this a little bit smaller
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so we can also see our scopes.
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And then we can see a little bit of the image here.
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I've got two end points on this curve on the bottom left is
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black, so left to right.
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We have the darkest part of the image on the left and then
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to the right is the brightest parts of the image
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or the brightest pixels.
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I'm going to click this darkest one
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and move it to the right.
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And you can see how on the wave form that we're stretching
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the image down, which looks a heck of a lot like,
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if we take this lift control and stretch the image down.
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So by default, just grabbing this end point
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is essentially the same move as a lift control.
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Same thing's true on the far right-hand side
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where we're dealing with the highlights.
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If I don't add any more points or make any other changes,
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clicking and dragging the highlights to the left
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will make the image brighter.
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Bringing it down to the bottom makes it darker.
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This acts precisely like the lift control
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in the three-way color wheels.
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So you can see my initial thought as to why custom curves
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can act very much like a primary correction,
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just like our three-way color wheels.
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Now, one of the things I love about custom curves
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is we can add splines.
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So if I come up to the options menu,
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click this into editable splines.
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Now, whenever I select a point, I get this handle control.
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And so now I've got handles on these,
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which allows you to make these very gentle,
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non aggressive moves that give you this kind of roll off.
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And you can really change the balance of an image
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simply by working with these controls.
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So if I think maybe his face is a little too dark here.
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Let's make this a little bit smaller.
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I think maybe his face is a little too dark.
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I can just grab the end of this spline, shorten it up.
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And I'm changing how far out this effect happens.
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And then I can change the balance of the highlights
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and say, "You know what?
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This increase in brightness,
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I want to move it down the brightness chain so that these
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mid-tones get brighter and just pull this out and make these
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very subtle adjustments."
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So this is a great way of working and balancing out your
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image in a way that feels a little bit more intuitive often
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than maybe the three-way color wheels.
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And this is one reason why a lot of colorists,
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especially colorists are also editors, love using curves,
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very intuitive, the splines work fantastic.
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And yes, you can add additional points
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simply by clicking and then adjusting.
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If you do add a point and you don't want it,
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you can right click on that point to make it go away.
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Now you don't have to just work overall
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on the overall image.
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You can also, let's make some quick little adjustments here.
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You could also make adjustments
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to individual color channels.
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So let's say I've made this overall brightness adjustment,
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but maybe I want to drop the red channel a little bit.
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Well, I can go ahead and use this little interface here
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and just select whatever color channel I want.
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In this case, the red channel, this curve turns red.
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Now the changes I make will only happen on the red channel
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and just like in the three-way color wheels.
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If you take a look at the scope,
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do you notice there is a counteracting move
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in green and blue, that comes down
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to DaVinci Resolves YRGB image processing
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to keep the overall brightness of the image the same.
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As all I'm doing is changing
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and effecting the colors of the image.
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Now having made these changes,
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if I were to go ahead and turn off editable splines,
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the moment I make any changes that control is going to snap
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into a linear control,
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and you're going to lose these spline effects
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the moment you make a change.
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See how that snapped.
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Let's go ahead and do a reset.
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To quickly link all of these back up together.
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You just click on this link control
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and now they're all linked back together.
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And finally, for some fun,
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you can go ahead and invert this control.
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And now I've inverted this image using this control here on
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the far left hand side that allows you to manipulate this
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curve strictly for effect.
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When I'm done with this curve,
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I can go ahead and close these expanded curves
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and anything we did up in the expanded curve.
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We can also do down here in the curve palette.
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Let's go ahead and reset that.
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And that is the fundamentals of working with custom curves
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here in DaVinci Resolve.
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