Search code examples
javageotiffboofcv

Write GeoTIFF metadata from one file to other

My task is to take one GeoTIFF, make some image segmentation on in, and save it to new GeoTIFF(with existing coordinates). If I understand correctly, the coordinates are preserved in GeoTIFF metadata. So I grab metadata from the original file:

File file = new File(inputFilePath);
ImageInputStream iis = ImageIO.createImageInputStream(file);
Iterator<ImageReader> readers = ImageIO.getImageReaders(iis);
IIOMetadata metadata=null;
ImageReader reader=null;
if (readers.hasNext()) {
    // pick the first available ImageReader
    reader = readers.next();
    // attach source to the reader
    reader.setInput(iis, true);
    // read metadata of first image
    metadata = reader.getImageMetadata(0);
 }

And when I do System.out.println("Metadata: "+metadata);, I see the correct XML tree of metatags. So I'm do some magic with image

System.out.println("Starting segmentation");
BufferedImage image = UtilImageIO.loadImage(inputImage);
// Select input image type.  Some algorithms behave different depending on image type
ImageType<MultiSpectral<ImageFloat32>> imageType = ImageType.ms(3, ImageFloat32.class);
ImageSuperpixels alg = FactoryImageSegmentation.fh04(new ConfigFh04(500, 30), imageType);
// Convert image into BoofCV format
ImageBase color = imageType.createImage(image.getWidth(), image.getHeight());
ConvertBufferedImage.convertFrom(image, color, true);
// Segment and display results
performSegmentation(alg, color);
System.out.println("Segmentation finished");

In result I obtain a BufferedImage(resultBufferedImage) with successfully image segmentation. And here starts my problems, I'm trying to save this BufferedImage with old metadata:

  BufferedOutputStream out;
    ImageWriter writer = ImageIO.getImageWriter(reader);
    ImageOutputStream imgout = null;
    FileOutputStream fos =null;
    fos = new FileOutputStream(outputImage);
    out = new BufferedOutputStream(fos);
    imgout = ImageIO.createImageOutputStream(out);
    writer.setOutput(imgout);
    ImageWriteParam param = writer.getDefaultWriteParam();
    IIOImage destIIOImage = new IIOImage(resultBufferedImage, null, metadata);
    System.out.println("Before write");
    writer.write(null, destIIOImage, null);
    System.out.println("After write");

I get printed "After write". But program is still running, I tried to wait, but no results. So when I kill process the file is created successfully, even with geodata. How can I determine the finish of writing and stop program? p.s. Image in default Ubuntu viewer seems to be nice, but when I opened it in QGIS I have transparent fields, and how can I make gray background transparent?enter image description here

Solution

  • Not a real answer, but here's two answers on how to make a TIFF transparent: