Tone Curve

• The horizontal axis represents the original values (0255), and the vertical axis represents the values after the changes (0255).

• By manipulating this, various image processing can be done.

• If y=x, then it remains the same.

• If y=-x, then the colors are inverted.

• If it is set to a step-like shape, it is called posterization.

• If it is set to a shape like a cubic function, it is called solarization.

• By setting separate tone curves for r, g, and b for a grayscale image, a pseudo-color image can be created.

  • For example, thermal imaging.

#digital Image Processing