3 color maximum algorithm

The 3 color maximum operator takes 3 input operands, transforms them according to assigned color settings and creates a virtual variable containing samples whose colors represent the maximum of the transformed operands. The algorithm is based on that described by Kloser et al.

3 color operator settings

The settings (Minimum color, Maximum color, Color display minimum, Color range) for each operand are entered on the 3 Color Maximum page of the Variable Properties dialog box. It may also be useful to specify the Color scheme for the new virtual variable on the Display page of the Variable Properties dialog box.

Scaled value

Each operand's sample values are transformed to scaled values. Samples with No_data value, result in an output sample color that represents the No_data color for the color scheme specified on the Display page of the Variable Properties dialog box.

The Scaled value algorithm is:

Scaled value = (Sample value – Color display minimum) / Color display range

Where:

Sample value	is the value of the sample in the original operand
Color display minimum	is Color display minimum on the 3 Color Maximum page of the Variable Properties dialog box.
Color display range	is the Color display range on the 3 Color Maximum page of the Variable Properties dialog box.

Output color

The scaled values from the operands are compared. The greatest scaled value (of the operands) becomes the Output color for the sample in the virtual variable.

See also

3 color maximum operator
3 color maximum settings
3 color maximum keyboard shortcuts

Echoview Help file 5.1.25 for Echoview 5.1.45 Wednesday 1st  February 2012

Please report any errors or omissions to support@echoview.com.