How To Read Curves
It doesn’t take long to get to grips with the ideas and concepts of what you can do with this tool, here’s a quick-start guide on the basics:
Vertical axis shows the new values for the selected band.
Horizontal axis shows input levels and tones from the original image.
An image in its original (unaltered) state will have a straight line of 45deg.
Bottom left is your pure black point, top right is your pure white point.
Important – Always make your curve adjustments via Layers > New Adjustment Layer > Curves rather than simply Image > Adjustments > Curves, so your curve can be edited later in your creative process if needed.
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