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First off, I am really thankful that I have been chosen to be a part of the moderation team. It really means a lot to me. Thanks so much @Global_HONOR
Today I am going to discuss about Tone curve.
It looks a bit complicated but actually it's quite easy to understand. It does the same work like the light panel but it will give you more flexibility to adjust the contrast and tone of different colours separately .
Before starting I would recommend you to read the 2nd part of this tutorial. Here is the link to my previous thread-
https://community.hihonor.com/global/topicdetail/Tutorial-Lightroom-Mobile-Editing-Tutorial-Part-2-Histogram-Light/topicId-69127/
At any point of the diagonal line (curve) if you drag the line up, it will make your image brighter and if you drag the curve down, it will make your image darker. It's quite similar to the Histogram. The left side of the horizontal axis represents the dark pixels and the right side represents the bright pixels or it is also known as input values. On the other hand the vertical axis represents the black at the bottom and white at the top (output values) . From the bottom-left to top-right the diagonal line goes like Blacks - Shadows - Mid tones - Highlights and then White. So you can make changes in specific part by pulling that part to upwards or downwards .
For example If you want to down the exposure of shadows part, just add a point on the shadows part (in the bottom 1/4 section of the curve) and drag it down. [ when you're dragging the shadows part, the other part might be effected. You can bring the other parts back to its previous position. ]. You will notice that the shadows part of your image will be getting darker as you drag it down . You can also increase the brightness of exact black part by pulling the left-end point to upward.
I'd recommend you to add three points on the three different parts of the curve first. [Just Tap once to add a point. Double tap on a point to remove it.] Then move any specific point according to your taste.
To increase the contrast in your photo you need to make a S like curve by dragging the shadows part slightly down and brightness part slightly upwards. It will make the brighter parts more brighter and the darker parts more darker. Similarly just do the opposite to decrease the contrast.
You can choose different color channels to make adjustments to individual colours. And the white or RGB means all the three channels are together. Basically, If you pull the red curve up, it will add more reds to your image and if you pull it down, it will make the red part cyan. If you pull down the green channel , it will add magenta and for blue channel it will be yellow. And the process of editing is same as I discussed above.
Parametric Curve - After playing with the point curve, you can refine the overall tones by using this curve. It's quite handy. There are three sliders at the bottom of the panel that devide the Histogram into four different regions (Shadows - Darks - Lights - Highlights). You can make adjustments based on those reasons. Even you can move those sliders to left or right to change the tonal output of those areas.
Note - If you make changes to point curve, it will not effect the parametric curve. They are completely independent.
How to open tone curve?
To open the tone curve all you need to do is just open the light panel and then click on the marked (curve) icon.
Now you may have the question that why the line is fixed diagonally across the graph? Why it is not fixed horizontally or vertically?
The answer is pretty simple. The extreme bottom left corner represents the darkest part. And you you can not make the darkest area more darker but you can make it brighter, right? That's why the left end of the line is fixed at bottom left corner. Similarly, you can not make the whitest part whiter. That's why the right most end is fixed at top right corner of the graph.
Hope this tutorial will help you. Until and unless you start playing with the curve, you won't understand how it actually works. So start using it right now.
Adios amigos, see you soon in my next article.
**Thankyou**
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