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Let's take a look at the curves tab  consist rgb curve  hue saturation curve

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used to vary the highlights and the shadows of the image.

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So image consist of the red green and blue channel so you can vary the highlights by dragging down

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and pulling it to the left increase highlights

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You can also make use of the Scopes here to get an idea of what is happening.

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So you can vary the highlights and the shadows here

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you can also put points here to do a traditional S curve

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you can also choose the individual channels red green blue and vary it

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next.

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Let's look at this.

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hue saturation curves to understand this.

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hue vs sat means you're changing the saturation of a selected hue.

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So let's for example

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take the skin tones of the person

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so let's take her skin tone for example.

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So I put point there

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So what is happening the this has selected a set of points which you can vary

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skin tone color so you can move this point and you can see that her skin tone is like changing to constrain

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this to a single line.

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You can hit the shift button and it can move in a straight line so it will be constrained along that

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line so you have varied saturation of the selected portion

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so the next thing is the hue vs hue  you can you reset this by double clicking anywhere and it reset

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hue vs hue where you're changing the hue of this selected hue

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lipstick color of this girl here.

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Let's select that lipstick color and so that you can see that it is selected three points

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what's happening is that it has selected some of the color here so to like narrow it down

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this point here can narrow the points and more so  that portion is really Selected  the lipstick

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color is selcted

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You can see that the hue changing and you can make it to a variety of color you can narrow the points

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so that only that portion is only selected

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you have make accurate point selection  to get rid of this

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other thing that if you want again there at the points here anywhere you find it easy to make your

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selections

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we can also look at this image so here

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changing the hue of this blue color well this sky here so you can see that a blue point selected

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vary that color and see changing of that color certain blue color.

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The next one is

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hue vs Luma

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to do that let's take this image so that you know you're changing the Luma value.

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selected hue

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luma means the brightness of any image so you can sselect the sun's color

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and you can bring down the value of that you're reducing the brightness of hue lets look

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earlier image

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of the sky.

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So let's select that first one select a point in the sky

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vary that you are desaturating changing the brightness value of

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that selected hue.

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You're making it like black and white.

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So you're reducing the brightness of that.

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You can see that images like breaking down because it's in HD format.

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So you need a higher quality to make drastic changes even turn it on until

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this is the Luma vs sat

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so you are changing saturation of selected luma

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That is brightness.

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So you select the sun here

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and what we do is we we can increase the saturation of that luma luma as I mentioned

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earlier is the brightness of the image that you can bring down this you can increase that brightness

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of that sun here or you can turn it on

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sat vs sat like similar to this

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you select a particular color

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varying saturation whatever color is there it's affected everywhere so different

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within this is only the brightness is changing before brightness value here this saturation value is

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changing it's increasing as we pull it down its decreasing pull it up it's increasing

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so this is the overview of the curve tab so rgb curve hu sat curve