.. _doublethreshold:

doublethreshold
***************


**Syntax:** :code:`doublethreshold(image, first threshold, second threshold)`

Sets pixel to 0 if its value is less than the first threshold. Sets pixel to 1 if pixel its value is larger than or equal to the first threshold and less than the second threshold (if any). Sets pixel to 2 if pixel its value is larger than or equal to the second threshold.

This command can be used in the distributed processing mode. Use :ref:`distribute` command to change processing mode from local to distributed.

Arguments
---------

image [input & output]
~~~~~~~~~~~~~~~~~~~~~~

**Data type:** uint8 image, uint16 image, uint32 image, uint64 image, int8 image, int16 image, int32 image, int64 image, float32 image

Image to process.

first threshold [input]
~~~~~~~~~~~~~~~~~~~~~~~

**Data type:** real

Pixels whose value is larger than or equal to this threshold and less than the second threshold are set to 1.

second threshold [input]
~~~~~~~~~~~~~~~~~~~~~~~~

**Data type:** real

Pixels whose value is larger than or equal to this threshold are set to 2.