Apply an RGB renderer to a raster layer to enhance feature visibility.
Use case
An RGB renderer is used to adjust the color bands of a multispectral image. Remote sensing images acquired from satellites often contain values representing the reflection of multiple spectrums of light. Changing the RGB renderer of such rasters can be used to differentiate and highlight particular features that reflect light differently, such as different vegetation types, or turbidity in water.
How to use the sample
Choose one of the stretch parameter types. The other options will adjust based on the chosen type. Add your inputs and click the 'Update' button to update the renderer.
How it works
- Create a
Raster
from a multispectral raster file. - Create a
RasterLayer
from the raster. - Create a
Basemap
from the raster layer and instantiate an ArcGISMap with it. - Create a
RGBRenderer
, specifying theStretchParameters
and other properties. - Set the renderer on the raster layer with
rasterLayer.setRasterRenderer(renderer)
.
Relevant API
- Basemap
- Raster
- RasterLayer
- RGBRenderer
- StretchParameters
About the data
The raster used in this sample shows an area in the south of the Shasta-Trinity National Forest, California.
Tags
analysis, color, composite, imagery, multiband, multispectral, pan-sharpen, photograph, raster, spectrum, stretch, visualization
Sample Code
/*
* Copyright 2017 Esri.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.esri.samples.rgb_renderer;
import java.io.File;
import java.util.Arrays;
import java.util.List;
import javafx.fxml.FXML;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Spinner;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import com.esri.arcgisruntime.layers.RasterLayer;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.Basemap;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.raster.MinMaxStretchParameters;
import com.esri.arcgisruntime.raster.PercentClipStretchParameters;
import com.esri.arcgisruntime.raster.RGBRenderer;
import com.esri.arcgisruntime.raster.Raster;
import com.esri.arcgisruntime.raster.StandardDeviationStretchParameters;
import com.esri.arcgisruntime.raster.StretchParameters;
public class RgbRendererController {
@FXML private HBox stdDeviationGroup;
@FXML private GridPane minMaxGroup;
@FXML private VBox percentClipGroup;
@FXML private MapView mapView;
@FXML private ComboBox<String> stretchTypeComboBox;
@FXML private Spinner<Integer> factorSpinner;
@FXML private Spinner<Integer> minPercentSpinner;
@FXML private Spinner<Integer> maxPercentSpinner;
@FXML private Spinner<Integer> minRedSpinner;
@FXML private Spinner<Integer> minGreenSpinner;
@FXML private Spinner<Integer> minBlueSpinner;
@FXML private Spinner<Integer> maxRedSpinner;
@FXML private Spinner<Integer> maxGreenSpinner;
@FXML private Spinner<Integer> maxBlueSpinner;
private RasterLayer rasterLayer;
public void initialize() {
// create raster
Raster raster = new Raster(new File(System.getProperty("data.dir"), "./samples-data/raster/Shasta.tif").getAbsolutePath());
// create a raster layer
rasterLayer = new RasterLayer(raster);
// create a basemap from the raster layer
Basemap basemap = new Basemap(rasterLayer);
ArcGISMap map = new ArcGISMap(basemap);
// set the map to the map view
mapView.setMap(map);
// set stretch types
stretchTypeComboBox.getItems().addAll("Min Max", "Percent Clip", "Std Deviation");
// hide options based on selected stretch type
stretchTypeComboBox.getSelectionModel().selectedItemProperty().addListener(e -> {
String type = stretchTypeComboBox.getSelectionModel().getSelectedItem();
minMaxGroup.setVisible("Min Max".equals(type));
percentClipGroup.setVisible("Percent Clip".equals(type));
stdDeviationGroup.setVisible("Std Deviation".equals(type));
});
// set up sliders to match constraint min + max <= 100
minPercentSpinner.valueProperty().addListener(e -> {
if (minPercentSpinner.getValue() + maxPercentSpinner.getValue() > 100) {
maxPercentSpinner.getValueFactory().setValue(100 - minPercentSpinner.getValue());
}
});
maxPercentSpinner.valueProperty().addListener(e -> {
if (minPercentSpinner.getValue() + maxPercentSpinner.getValue() > 100) {
minPercentSpinner.getValueFactory().setValue(100 - maxPercentSpinner.getValue());
}
});
stretchTypeComboBox.getSelectionModel().select(0);
updateRenderer();
}
/**
* Updates the raster layer renderer according to the chosen property values.
*/
public void updateRenderer() {
StretchParameters stretchParameters;
switch (stretchTypeComboBox.getSelectionModel().getSelectedItem()) {
case "Min Max":
List<Double> minValues = Arrays.asList(minRedSpinner.getValue().doubleValue(), minGreenSpinner.getValue()
.doubleValue(), minBlueSpinner.getValue().doubleValue());
List<Double> maxValues = Arrays.asList(maxRedSpinner.getValue().doubleValue(), maxGreenSpinner.getValue()
.doubleValue(), maxBlueSpinner.getValue().doubleValue());
stretchParameters = new MinMaxStretchParameters(minValues, maxValues);
break;
case "Percent Clip":
stretchParameters = new PercentClipStretchParameters(minPercentSpinner.getValue(), maxPercentSpinner.getValue());
break;
default:
stretchParameters = new StandardDeviationStretchParameters(factorSpinner.getValue());
}
// create rgb renderer
RGBRenderer rgbRenderer = new RGBRenderer(stretchParameters, Arrays.asList(0, 1, 2), null, true);
rasterLayer.setRasterRenderer(rgbRenderer);
}
/**
* Stops and releases all resources used in application.
*/
void terminate() {
if (mapView != null) {
mapView.dispose();
}
}
}