IsGrayscale Class Reference

Inheritance diagram for IsGrayscale:

Collaboration diagram for IsGrayscale:

Public Member Functions
String	getURI ()
boolean	attribute (GridCoverage raster)
Value	evaluate (ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException

Member Function Documentation

attribute()

boolean attribute

(

GridCoverage

raster

)

Reimplemented from RasterAttributeBinaryFunction.

                                                      { 
                RenderedImage image=raster.render(null);
                image.getData().getDataBuffer().getDataType();
                // Test the type
            if ( image.getData().getDataBuffer().getDataType() == BufferedImage.TYPE_BYTE_GRAY ) return true ;
            if ( image.getData().getDataBuffer().getDataType() == BufferedImage.TYPE_USHORT_GRAY ) return true ;
            // Test the number of channels / bands
            if ( image.getData().getNumBands() == 1 ) return true ; // Single channel => gray scale
            return false;
        }

evaluate()

Value evaluate ( ValueFactory  valueFactory, Value...  args  ) throws ValueExprEvaluationException

inherited

                                                                                                            {
                // TODO Auto-generated method stub
                return null;
        }

getURI()

String getURI

(

)

                               {
                return POSTGIS.st_isGrayscale.stringValue();
        }

References POSTGIS.st_isGrayscale.