IMAGELG2

Description

Finds the natural logarithm values in image channels, between two image files or within one image file.

Parameters

Name	Type	Length	Value range
Input1: Input raster channel(s) *	Raster port	1 - 1024
Result1: Output raster channel(s)	Raster port	0 - 1024
Replacement Value for Invalid Numeric Value	Float	0 - 1	0.0 - 100000.0 Default: 0.0

* Required parameter

Parameter descriptions

Input1: Input raster channel(s)

Specifies the input raster channel(s) to be processed.

Result1: Output raster channel(s)

Specifies the output image channel(s) produced by taking the natural logarithm of the input image channel(s) (DBIC).

If the output file (FILO) does not already exist, this parameter should be empty.

Duplicate output channels are NOT allowed. The total number of input channels (DBIC) must be equal to the total number of output channels (DBOC).

Output channels must be 32-bit real.

Replacement Value for Invalid Numeric Value

Specifies the number used as replacement for invalid numerical values.

The default value is 0.0.

Details

IMAGELG2 takes all the pixel values from the input channel(s) and calculates the natural logarithm value, placing those values in the output channel(s). If an invalid value exists, the value specified in the Replacement Value (EMPTYVL) parameter is used instead.

The output channel(s) must be 32-bit real.