Tone Mapping & Dynamic Range Tripod Collective

link-> http://www.indifference.com/ICAMDorgHDR/<-link

Dimensionless Ratios based on Spectrum of Light:

Dynamic Range Photography is a group of photos on the same shot angle and position (using a tripod). The photos are captured at various exposures, keeping the F stop unchanged.

What you end with is a group of various spectrums of natural light. It is a way to enhance digital photos in a natural realistic looking way. Various Light Luminance* captures onto one contact sheet. Think of Exposing Photo Paper mutliple times in a darkroom.

*Luminance - usually expressed in candelas per square meter.

A Human can see a range of light of a ration 10,000:1

100,000 cadelas per square meter is a typical range of a sunlit scene.

Star in the sky: 0.001 cadelas per square meter

Sun:1,000,000,000 cadelas per square meter

However the range in nature is far greater so we take in light perspectives in incriments that we choose and adjust with our eye's retna. We know this because we can see the sunlight and the visibility of a star in the sky by adjusting our range.

The main point of this lecture is to show that you can capture mutliple pieces of various light ranges to produce a glowing revealing and High Definition Image of the scene you are trying to capture.

A logarithmic scale might give a graphical understanding of the various lighting ratios.

To more easily represent such different values, it is common to use a logarithmic scale to plot the luminance. The scanline below represents the log base 10 of the luminance, so going from 0.1 to 1 is the same distance as going from 100 to 1000, for instance.

Indoor Scene with a window will produce a range of 100,000:1