Relationship between the Tone Curve and the Histogram of a Photographic Image
![](/img/demonstrations-branding.png)
Requires a Wolfram Notebook System
Interact on desktop, mobile and cloud with the free Wolfram Player or other Wolfram Language products.
This Demonstration shows the effect of tone curve adjustments on a photographic image and its histogram. The tone curve defines the brightness relationship between the input (original) values (on the axis) and output (result) values (on the
axis).The histogram displays the tonal distribution of the image. It displays level of brightness on the
axis from dark to light. The
axis represents the total number of pixels in the image with that level of brightness. Adjust the tone curve by dragging any of the five locators or choosing one of the preset schemes.
Contributed by: Erik Mahieu (March 2011)
Open content licensed under CC BY-NC-SA