Running the 'DarkSubtractionCorrection' task in an API on reflectance values from a calibrated Worldview 2 data where the image boundary data has a pixel state of 1 are being calculated as negative values on the output raster. How do I stop this? Here is the section of code doing the calculation (with forcing 'data ignore value' param).

;***Add data ignore value to the metadata ****
IF (metadata.HasTag ('data ignore value')) THEN BEGIN
metadata.UpdateItem, 'data ignore value', 0.
ENDIF ELSE BEGIN
metadata.AddItem, 'data ignore value', 0.
ENDELSE


RS_Task = ENVITASK('DarkSubtractionCorrection')

;
; props = RS_Task.parameterNames()
; print, props

; Define inputs
RS_Task.INPUT_RASTER = TOARRas
RS_Task.VALUES = scats
Rs_Task.OUTPUT_RASTER_URI = Rrs_out

RS_Task.Execute