2008.09.27 17:30 "Re: [Tiff] Compression code 34719", by Toby Thain

On 27-Sep-08, at 12:32 PM, ComSquare Martin Osieka wrote:

Does anybody know what the compression code 34719 in the compression tag stands for?

These are tifs generated from a MS tool. Everything else in the tif

> looks fine (RGB, 8bits per channel,…).

But for sure the resulting image shows completely black because of the missing decoder in libtiff.

MS is able to open and view these tiffs.

And that's the whole point. An un-interoperable (non standard) codec *ensures* lock-in to their tools. Good luck finding documentation.

--Toby

>

There is only one strip in the file and it starts with

> 0x02,0x00,0x00,0x00,0x7B,
> 0x00,0x00,0x00,0x08,0x33,0x00,0x00,0x03,0x00,0x00,0x00,
>
> 0x00,0x00,0x00,0x00,0xFF,0xFF,0xFF,0xFF,
> 0x00,0x00,0x00,0x00,0x78,0x01,0xED,0x9B,
>
> 0x5B,0x88,0x55,0x55,0x18,0xC7,0xBF,0xD9,0x67,0x8E,
> 0x33,0xA6,0x96,0x86,0xA5,0x65,
>
> 0xD9,0x9E,0x83,0x9A,
> 0x43,0x12,0x13,0x47,0xA1,0x87,0x22,0xA5,0x53,0x54,0x2A,0x1C,