The Curves Tool in Photoshop can be a bit confusing and overwhelming. Here is a simple tutorial to help you understand how to use it.
Understanding Tone Mapping - Lenscraft
How to use Curves in Photoshop
How to Understand the Curves Tool in Photoshop
Using the Curves adjustment in Photoshop
How the Photoshop Curves Tool Works - Lenscraft
Using the Photoshop Curves Tool
How the Photoshop Curves Tool Works - Lenscraft
How to Use Curves in Photoshop
Understand Curves in Photoshop — The School of Photography - Courses, Tutorials & Books
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Realtime Photoshop-style “curves” using shaders, by anselan
Color Correction Using Curves