Canon FS 3.6 manual How to Interpret a Histogram, How to Adjust a Histogram, Image Image Image

Step 3 • Adjusting Images

How to Interpret a Histogram

You can select the entire image or specify an area for which a histogram will be generated. The heights of the peaks of the histogram are directly related to the volume of data with the corresponding values.

Bright Portion

Dark Portion

Entire Image

How to Adjust a Histogram

Distribution of data with a bias toward highlights.

Distribution of data with a bias toward shadows.

Distribution of data widely distributed between shadows and highlights.

To change the contrast in an image, the distribution of data between shadows and highlights can be adjusted by dragging the shadow and highlight marks at the bottom of the histogram. All of the data lying to the outside (left) of the shadow mark is changed to a zero value and all of the data lying to the outside (right) of the highlight mark is changed to a 255 value. The examples below show adjustments to improve the contrast.

It is generally advisable to use the Auto Correction feature, which is explained below, to adjust contrast settings. The Auto Correction feature will perform the adjustments shown.

Image 1

Image 2

Image 3

Image with a bias toward highlights

The shadow mark is moved toward the highlight end.

Image with a bias toward shadows

The highlight mark is moved toward the shadow end.

Image with well distributed data

Both the shadow and highlight marks have been moved inward.

59