When I tried it myself, it was not that complicated at all. In fact, curve editing does a lot to make your images stand with very less effort.
Let me show you how I would do curve editing on my images. This is just a very basic and simplified example that I will show you.
I do the curve editing to enhance my images and to make the object in the image stands out.
For the example I used a free image editor software online called Pixlr
To get into the curve option, you can click Adjustment --> Curves on the toolbar menu.
The way I edited the curve was a basic technique to my image sharper. You can do limitless variations depending on the image's requirement.
Have fun trying :D
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