Example usage for javax.imageio ImageReadParam setSourceBands

Introduction

In this page you can find the example usage for javax.imageio ImageReadParam setSourceBands.

Prototype

public void setSourceBands(int[] sourceBands) 

Source Link

Document

Sets the indices of the source bands to be used.

Usage

From source file:ShowImage.java

public static void main(String args[]) throws IOException {
    List<File> files = ImageIOUtils.getFiles(args, new String[] { "ntf", "nsf" });

    for (Iterator iter = files.iterator(); iter.hasNext();) {
        try {//from   ww  w  .  j  av a  2  s .c  o m
            File file = (File) iter.next();
            log.debug("Reading: " + file.getAbsolutePath());
            NITFReader imageReader = (NITFReader) ImageIOUtils.getImageReader("nitf", file);

            for (int i = 0; i < imageReader.getRecord().getImages().length; ++i) {
                log.debug(file.getName() + "[" + i + "]");

                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                ImageSubheader subheader = imageReader.getRecord().getImages()[i].getSubheader();
                subheader.print(new PrintStream(stream));
                log.debug(stream.toString());

                try {
                    int numBands = subheader.getBandCount();
                    String irep = subheader.getImageRepresentation().getStringData().trim();
                    int bitsPerPixel = subheader.getNumBitsPerPixel().getIntData();
                    int nBytes = (bitsPerPixel - 1) / 8 + 1;

                    if (irep.equals("RGB") && numBands == 3) {
                        BufferedImage image = imageReader.read(i);
                        ImageIOUtils.showImage(image, file.getName() + "[" + i + "]", true);
                    } else {
                        // read each band, separately
                        for (int j = 0; j < numBands; ++j) {
                            if (nBytes == 1 || nBytes == 2 || nBytes == 4 || nBytes == 8) {
                                ImageReadParam readParam = imageReader.getDefaultReadParam();
                                readParam.setSourceBands(new int[] { j });
                                BufferedImage image = imageReader.read(i, readParam);
                                ImageIOUtils.showImage(image, file.getName() + "[" + i + "][" + j + "]", true);

                                ImageIO.write(image, "jpg",
                                        new FileOutputStream("image" + i + "_" + j + ".jpg"));

                                // downsample
                                // readParam.setSourceSubsampling(2, 2, 0,
                                // 0);
                                // BufferedImage smallerImage = imageReader
                                // .read(i, readParam);
                                //
                                // ImageIOUtils.showImage(smallerImage,
                                // "DOWNSAMPLED: " + file.getName());

                            }
                        }
                    }
                } catch (Exception e) {
                    System.out.println(ExceptionUtils.getStackTrace(e));
                    log.error(ExceptionUtils.getStackTrace(e));
                }
            }
        } catch (Exception e) {
            log.debug(ExceptionUtils.getStackTrace(e));
        }
    }
}

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From source file:nitf.imagej.NITF_Reader.java

/**
 * Opens the requested NITF, displaying a Text Window with the metadata
 * contents, and an Image window for each image in the file
 * //w w w.  j  a v a2s .  c  o  m
 * @param dir
 * @param name
 */
public void openNITF(File file) {
    try {
        log.debug("Reading: " + file.getAbsolutePath());
        NITFReader imageReader = (NITFReader) ImageIOUtils.getImageReader("nitf", file);

        Record record = imageReader.getRecord();
        // print the record contents to a byte stream
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        record.print(new PrintStream(out));

        TextWindow resultsWindow = new TextWindow(file.getName() + " [metadata]", "",
                IJ.getInstance().getWidth(), 400);
        TextPanel textPanel = resultsWindow.getTextPanel();
        textPanel.append(out.toString());
        textPanel.setFont(new Font("Courier New", Font.PLAIN, 16));
        resultsWindow.setVisible(true);

        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

        for (int i = 0; i < record.getImages().length; ++i) {
            ImageSubheader subheader = record.getImages()[i].getSubheader();
            try {
                int numCols = subheader.getNumCols().getIntData();
                int numRows = subheader.getNumRows().getIntData();
                int numBands = subheader.getBandCount();
                String irep = subheader.getImageRepresentation().getStringData().trim();
                int bitsPerPixel = subheader.getNumBitsPerPixel().getIntData();

                ImageReadParam readParam = imageReader.getDefaultReadParam();

                String downsampleString = "";

                // if the image is larger than 1.5 times the screen
                // width/height,
                // then just downsample right away
                if (numCols > (screenSize.width * 1.5) || numRows > (screenSize.height * 1.5)) {
                    int xTimes = (int) (numCols / (double) screenSize.width);
                    int yTimes = (int) (numRows / (double) screenSize.height);

                    downsampleString = " (downsampled from " + numCols + "x" + numRows;

                    // pick the min, in case it turns out to be a little
                    // strip
                    int pixelSkip = Math.min(xTimes, yTimes);
                    numCols = (int) Math.ceil(numCols / pixelSkip);
                    numRows = (int) Math.ceil(numCols / pixelSkip);

                    downsampleString += "   to   " + numCols + "x" + numRows + ")";
                    readParam.setSourceSubsampling(pixelSkip, pixelSkip, 0, 0);
                }

                if (irep.equals("RGB") && numBands == 3) {
                    BufferedImage image = imageReader.read(i, readParam);
                    ImagePlus imagePlus = new ImagePlus(
                            file.getName() + " [" + i + "] - RGB" + downsampleString, image);
                    imagePlus.show();
                } else {
                    ImageStack imageStack = new ImageStack(numCols, numRows);
                    // read each band, separately
                    for (int j = 0; j < numBands; ++j) {
                        if (bitsPerPixel == 16 || bitsPerPixel == 8 || bitsPerPixel == 32
                                || bitsPerPixel == 64) {
                            readParam.setSourceBands(new int[] { j });
                            BufferedImage image = imageReader.read(i, readParam);
                            imageStack.addSlice(file.getName() + " [" + i + "] Band " + j + downsampleString,
                                    getPixelsFromBufferedImage(image));
                        }
                    }
                    if (imageStack.getSize() > 0) {
                        ImagePlus imagePlus = new ImagePlus(file.getName() + " [" + i + "]" + downsampleString,
                                imageStack);
                        imagePlus.show();
                    }
                }
            } catch (Exception e) {
                log.debug(ExceptionUtils.getStackTrace(e));
            }
        }
    } catch (Exception e) {
        log.debug(ExceptionUtils.getStackTrace(e));
        IJ.error(e.getMessage());
    }
}

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