2018.10.15 13:20 "Re: [Tiff] Zstd and WebP compression in TIFF", by Bob Friesenhahn

> On Sun, 14 Oct 2018 at 10:50:11, Bob Friesenhahn wrote:

The next libtiff release will support Zstd and WebP compression options.

Hi Bob,

Could you tell me the value of the Compression tag (0x0103) for these formats?

This is what tiff.h has (decimal):

#define     COMPRESSION_ZSTD            34926
#define     COMPRESSION_WEBP            34927

If these conflict with a previous official allocation from Adobe, this would be a good time to provide evidence of that (prior to the next libtiff release when they are introduced).

There are some other tags allocated in support of these compression formats:

#define TIFFTAG_WEBP_LEVEL              65568
#define TIFFTAG_WEBP_LOSSLESS           65569
#define TIFFTAG_ZSTD_LEVEL              65564

Bob
--
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/