How to convert a 2D array of pixels in to a grayscale planar image

Question

Im having following problems, I hope someone may help me.
1.     I want to convert a 2D array of pixels (Grayscale values) into a Grayscale PlannerImage. I tried the following code I found on net.
The steps to do this are:
-Construct a DataBuffer from your data array.
-Construct a SampleModel describing the data layout.
-Construct a Raster from the DataBuffer and SampleModel. You can use methods from the RasterFactory class to do this.
-Construct a ColorModel which describes your data. The factory method PlanarImage.createColorModel(sampleModel) will take care of this for some common cases.
-Construct a TiledImage with the SampleModel and ColorModel.
-Populate the TiledImage with your data by using the TiledImage.setData() method to copy your raster into the TiledImage.
Only the last step involves any actual processing. The rest is just object creation.
public static RenderedImage createRenderedImage(float[][] theData, int width, int height, int numBands) {
int len = width * height * numBands;
Point origin = new Point(0,0);
// create a float sample model
SampleModel sampleModel =
RasterFactory.createBandedSampleModel(DataBuffer.TYPE_FLOAT,width,height,numBands);
// create a compatible ColorModel
ColorModel colourModel = PlanarImage.createColorModel(sampleModel);
// create a TiledImage using the float SampleModel
TiledImage tiledImage = new TiledImage(origin,sampleModel,width,height);
// create a DataBuffer from the float[][] array
DataBufferFloat dataBuffer = new DataBufferFloat(theData, len);
// create a Raster
Raster raster = RasterFactory.createWritableRaster(sampleModel,dataBuffer,origin);
// set the TiledImage data to that of the Raster
tiledImage.setData(raster);
RenderedImageAdapter img = new RenderedImageAdapter((RenderedImage)tiledImage);
return img;
I passed it 2D array of pixels with 3 bands, and it gave an exception >>Array index out of bounds at this line >>tiledImage.setData(raster). Then I tried it with a 1D array of length height*width with a single band. So Now it gives me a monochromatic RenderedImage. How can I make it a grayscale PlanarImage.

Answer 1

jyang, thank you very much for your response. I believe I found a different solution all together, by converting each 16-bit intensity value into an 8-bit intensity value via an intensity ratio (ie: divide each intensity by the maximum and multiply by 256). The attachment shows the new program.
Attachments:
mod_image.vi ‏2004 KB