private void writeThumb( ImageOutputStream ios, BufferedImage thumb, JFIFExtensionMarkerSegment jfxx, int index, boolean onlyOne, JPEGImageWriter writer) throws IOException { ColorModel cm = thumb.getColorModel(); ColorSpace cs = cm.getColorSpace(); if (cm instanceof IndexColorModel) { // We never write a palette image into the header // So if it's the only one, we need to write the header first if (onlyOne) { write(ios, writer); } if ((jfxx == null) || (jfxx.code == THUMB_PALETTE)) { writeJFXXSegment(index, thumb, ios, writer); // default } else { // Expand to RGB BufferedImage thumbRGB = ((IndexColorModel) cm).convertToIntDiscrete(thumb.getRaster(), false); jfxx.setThumbnail(thumbRGB); writer.thumbnailStarted(index); jfxx.write(ios, writer); // Handles clipping if needed writer.thumbnailComplete(); } } else if (cs.getType() == ColorSpace.TYPE_RGB) { if (jfxx == null) { if (onlyOne) { write(ios, thumb, writer); // As part of the header } else { writeJFXXSegment(index, thumb, ios, writer); // default } } else { // If this is the only one, write the header first if (onlyOne) { write(ios, writer); } if (jfxx.code == THUMB_PALETTE) { writeJFXXSegment(index, thumb, ios, writer); // default writer.warningOccurred(JPEGImageWriter.WARNING_NO_RGB_THUMB_AS_INDEXED); } else { jfxx.setThumbnail(thumb); writer.thumbnailStarted(index); jfxx.write(ios, writer); // Handles clipping if needed writer.thumbnailComplete(); } } } else if (cs.getType() == ColorSpace.TYPE_GRAY) { if (jfxx == null) { if (onlyOne) { BufferedImage thumbRGB = expandGrayThumb(thumb); write(ios, thumbRGB, writer); // As part of the header } else { writeJFXXSegment(index, thumb, ios, writer); // default } } else { // If this is the only one, write the header first if (onlyOne) { write(ios, writer); } if (jfxx.code == THUMB_RGB) { BufferedImage thumbRGB = expandGrayThumb(thumb); writeJFXXSegment(index, thumbRGB, ios, writer); } else if (jfxx.code == THUMB_JPEG) { jfxx.setThumbnail(thumb); writer.thumbnailStarted(index); jfxx.write(ios, writer); // Handles clipping if needed writer.thumbnailComplete(); } else if (jfxx.code == THUMB_PALETTE) { writeJFXXSegment(index, thumb, ios, writer); // default writer.warningOccurred(JPEGImageWriter.WARNING_NO_GRAY_THUMB_AS_INDEXED); } } } else { writer.warningOccurred(JPEGImageWriter.WARNING_ILLEGAL_THUMBNAIL); } }