# Histogram Operations

Example of a histogram match using USGS DOQs. The image on the left is a composite of 4 different DOQs. Each DOQ has a different radiometry. The image on the right is the output from orthoigen using a histogram match. |

OSSIM provides histogram-based color enhancement options to change the output of your data based on a histogram file. Histogram operations include:

**Auto**Automatically adjust the histogram based on the min and max histogram values.**Match**Automatically adjust the histogram to match another image.**Linear**Linear contrast stretch using a standard deviation from the mean (e.g. 1, 2, or 3) or a user defined min/max value.

Note that histogram operation operations require an input image and a corresponding histogram file ("*.his"). The histogram file can be generated using ossim-create-histo or ossim-img2rr.

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Last modified 9 years ago
Last modified on Oct 20, 2010, 6:38:09 AM

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