Using the Histogram process

This process is used to extract a histogram and histogram statistics based on the image, which are included with the image service definition as part of the process metadata. This can be an expensive process for the central processing unit (CPU) and generally should not be applied by default. This process should only be used when histogram statistics are explicitly required. For example, some stretch functions can be based on values in the histogram such as standard deviation or minimum/maximum values.

You can choose to include or exclude transparent values as well as the histogram bin values. You can also choose to calculate more detailed statistics, such as kurtosis; however, these are more CPU expensive.

An image service client can view the histogram values on the Properties dialog box under the Metadata tab. The Server Process node on the Metadata tab provides the histogram values calculated on the image service. The Source node presents three additional tabs. You can click the Metadata tab on the Source node to access the histogram values calculated for the source images that are used to create the returned image.