Apache POI-HSSF distorts image size when adding picture into Excel cell

Question

I am adding a picture into a cell using Apache POI-HSSF. The image is 120x100 but no matter what I do and how I resize it, the Excel spreadsheet always shows it spanning multipl

Answer 1

I created another empty image with the width taken from sheet.getColumnWidthInPixels, draw the necessary image over it and used AddDimensionedImage.EXPAND_ROW_AND_COLUMN to fit it exactly into the cell:

    HSSFRow imageRow = sheet.createRow(row);

    BufferedImage image = ImageIO.read(Paths.get(pathToImage).toUri().toURL());

    AddDimensionedImage addImage = new AddDimensionedImage();
    float columnWidth = sheet.getColumnWidthInPixels(0);

    BufferedImage off_Image = new BufferedImage((int) columnWidth, actualImageHeight, BufferedImage.TYPE_INT_RGB);
    Graphics2D g2 = off_Image.createGraphics();
    g2.setColor(new Color(192,192,192));
    g2.fillRect(0, 0, off_Image.getWidth(), off_Image.getHeight());
    g2.drawImage(image, 0, 0, null);
    g2.dispose();

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ImageIO.write(off_Image, "jpg", baos);
    byte[] bytes = baos.toByteArray();

    double reqImageWidthMM = ((double) off_Image.getWidth()) / ConvertImageUnits.PIXELS_PER_MILLIMETRES;
    double reqImageHeightMM = ((double) off_Image.getHeight()) / ConvertImageUnits.PIXELS_PER_MILLIMETRES;

    addImage.addImageToSheet("A1", sheet, bytes, reqImageWidthMM, reqImageHeightMM, AddDimensionedImage.EXPAND_ROW_AND_COLUMN);

I had to copy AddDimensionedImage.java to my classpath and overload addImageToSheet to accept byte array.

Before that I tried other options mentioned here but it didn't help. Hope my answer will be useful to someone.