Generate TIFF with Metadata - TAG_STRIP_OFFSETS not working properly

[leordev]

Guys, I'm trying to generate a TIFF image and it must have compression G4 (CCITT_T_6) and also the StripOffsets must be 8.

The problem that I have is that when I don't set the TAG_STRIP_OFFSETS it's creating usually with the vale 188 on this tag. But if I try to set TAG_STRIP_OFFSETS as 8, it's changing the compression to LZW.

Can you check my below code and give me any idea in how to solve this?

private IIOMetadata getMetadata(ImageWriter iw) throws IIOInvalidTreeException {
        TIFFImageMetadata tiffMd = (TIFFImageMetadata) iw.getDefaultImageMetadata(null, tiffImageWriteParam);
        tiffMd.addShortOrLongField(BaselineTIFFTagSet.TAG_NEW_SUBFILE_TYPE,0);
        tiffMd.addShortOrLongField(BaselineTIFFTagSet.TAG_IMAGE_WIDTH,CHECK_WIDTH);
        tiffMd.addShortOrLongField(BaselineTIFFTagSet.TAG_IMAGE_LENGTH,CHECK_HEIGHT);
        tiffMd.addShortOrLongField(BaselineTIFFTagSet.TAG_BITS_PER_SAMPLE,1);
        tiffMd.addShortOrLongField(BaselineTIFFTagSet.TAG_COMPRESSION,BaselineTIFFTagSet.COMPRESSION_CCITT_T_6);
        tiffMd.addShortOrLongField(BaselineTIFFTagSet.TAG_PHOTOMETRIC_INTERPRETATION,0);
        tiffMd.addShortOrLongField(BaselineTIFFTagSet.TAG_SAMPLES_PER_PIXEL,1);
        tiffMd.addShortOrLongField(BaselineTIFFTagSet.TAG_ROWS_PER_STRIP,CHECK_HEIGHT);
        tiffMd.addShortOrLongField(BaselineTIFFTagSet.TAG_STRIP_OFFSETS,8); // Problematic line -> changes to LZW

        // Workaround for Rational X/Y Resolutions
        long[] xRes = new long[]{200, 1};
        long[] yRes = new long[]{200, 1};
        Node node = tiffMd.getAsTree(tiffMd.getNativeMetadataFormatName());
        TIFFField fieldXRes = new TIFFField(
                BaselineTIFFTagSet.getInstance().getTag(BaselineTIFFTagSet.TAG_X_RESOLUTION),
                TIFFTag.TIFF_RATIONAL, 1, new long[][]{xRes});
        TIFFField fieldYRes = new TIFFField(
                BaselineTIFFTagSet.getInstance().getTag(BaselineTIFFTagSet.TAG_Y_RESOLUTION),
                TIFFTag.TIFF_RATIONAL, 1, new long[][]{yRes});
        node.getFirstChild().appendChild(fieldXRes.getAsNativeNode());
        node.getFirstChild().appendChild(fieldYRes.getAsNativeNode());
        tiffMd.mergeTree(tiffMd.getNativeMetadataFormatName(), node);

        tiffMd.addShortOrLongField(BaselineTIFFTagSet.TAG_RESOLUTION_UNIT, 2);
        return tiffMd;
    }

Thank you, and sorry if it's not an issue in the library.