Jpeg from Tiff (jpeg-compressed)

Question

How can i extract image from JPEG-compressed TIFF file ?

I've read bytes according to StripOffests and StripBytesCount fields, but i couldn't load an image from them.

Answer 1

Old style TIFF-JPEG (compression type 6) basically stuffed a normal JFIF file inside of a TIFF wrapper. The newer style TIFF-JPEG (compression type 7) allows the JPEG table data (Huffman, quantization), to be stored in a separate tag (0x015B JPEGTables). This allows you to put strips of JPEG data with SOI/EOI markers in the file without having to repeat the Huffman and Quantization tables. This is probably what you're seeing with your file. The individual strips begin with the sequence FFD8, but are missing the Huffman and quantization tables. This is the way that Photoshop products usually write the files.

Answer 2

Using JAI:

int TAG_COMPRESSION             = 259;
int TAG_JPEG_INTERCHANGE_FORMAT = 513;

int COMP_JPEG_OLD  = 6;
int COMP_JPEG_TTN2 = 7;

SeekableStream stream = new ByteArraySeekableStream(imageData);
TIFFDirectory    tdir = new TIFFDirectory(stream, 0);
int       compression = tdir.getField(TAG_COMPRESSION).getAsInt(0);

// Decoder name
String decoder2use = "tiff";
if (compression == COMP_JPEG_OLD) { 
    // Special handling for old/unsupported JPEG-in-TIFF format:
    // {@link: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4929147 }
    stream.seek(tdir.getField(TAG_JPEG_INTERCHANGE_FORMAT).getAsLong(0));
    decoder2use = "jpeg";
}

// Decode image
ImageDecoder  dec = ImageCodec.createImageDecoder(decoder2use, stream, null);
RenderedImage img = dec.decodeAsRenderedImage();

Great solution , helped me a lot . Just to add , if you have multiple pages in TIFF you have to repeat reading the stream with defining a different directory number in TIFFDirectory object and repeat all of the above.

TIFFDirectory tdir = new TIFFDirectory(stream, 1);