I'm having problem with the WritableRaster.setPixel() method. Supposely
setPixel may take input as int, float, or double. But when I created a
sample model of type DataBuffer.BYTE_DATA, and do setPixel with double
array as input, I get all the wrong values. However, if I use int array
as input, everything is fine.

Enclosed is a short test program. I created a ComponenetSampleModel of
width=10, height=10, band=3, datatype = BYTE_DATA. Then I initialized a
double array of size 300, then do setPixel. When I do getPixel to print
out the actual numbers, they are all wrong. Then I iniatialized a int
array of size 300, and did the same thing. This time the numbers are
correct.

import java.awt.*;
import java.awt.image.*;

public class SetPixelTest {
    public static void main(String[] args) {
        int[] offsets = {0, 1, 2};
        int[] results;

        SampleModel sampleModel = new ComponentSampleModel(
            DataBuffer.BYTE_DATA,
            10, 10,
            3, 30,
            offsets);

        WritableRaster raster = Raster.createWritableRaster(sampleModel, null);

        /* Use double as input. */
        double[] dblpxls = new double[300];
        for (int i = 0; i < 300; i++) {
            dblpxls[i] = (double)i;
        }
        raster.setPixel(0, 0, 10, 10, dblpxls);

        results = raster.getPixel(0, 0, 10, 10, (int[])null);
        for (int i = 0; i < 300; i++) {
            System.out.print(results[i]);
            System.out.print(" ");
        }
        System.out.println();
        System.out.println();

        /* Use int as input. */
        int[] intpxls = new int[300];
        for (int i = 0; i < 300; i++) {
            intpxls[i] = i;
        }
        raster.setPixel(0, 0, 10, 10, intpxls);

        results = raster.getPixel(0, 0, 10, 10, (int[])null);
        for (int i = 0; i < 300; i++) {
            System.out.print(results[i]);
            System.out.print(" ");
        }
        System.out.println();
        System.out.println();
    }
}