code: private double valueToPixelValue(GriddedTile griddedTile, double value) {
  
  		double pixelValue = value;
  
  		if (griddedCoverage != null
  				&& griddedCoverage.getDataType() == GriddedCoverageDataType.INTEGER) {
  
  			pixelValue -= griddedCoverage.getOffset();
  			pixelValue /= griddedCoverage.getScale();
  			if (griddedTile != null) {
  				pixelValue -= griddedTile.getOffset();
  				pixelValue /= griddedTile.getScale();
  			}
  
  		}
  
  		return pixelValue;
  	}
docs: Convert integer coverage typed coverage data value to a pixel value
  through offsets and scales
  
  @param griddedTile
  gridded tile
  @param value
  coverage data value
  @return pixel value