2018.05.11 01:43 "[Tiff] LZ4 compression", by fx HAYAKAWA MICHIO
Thread
2018.06.08 00:29 "Re: [Tiff] LZ4 compression", by fx HAYAKAWA MICHIO
Oh sorry, Even! I didn't check the repository.
How about followings?
#define COMPRESSION_LZ4 34927 /* LZ4 */
#define TIFFTAG_LZ4QUALITY 65564 /* LZ4 acceleration factor */
Thanks,
Michio
-----Original Message-----
Cc: fx HAYAKAWA MICHIO <michio.hayakawa@fujixerox.co.jp> Subject: Re: [Tiff] LZ4 compression
On vendredi 8 juin 2018 00:02:46 CEST fx HAYAKAWA MICHIO wrote:
I successfully implemented LZ4 compression in libtiff on Windows platform. LZ4 frame format is used for compression scheme. LZ4 frame is widely
> used for various applications.
Does anyone have any test images to see LZ4 compression characteristics?
I also modified tiffcp to support LZ4, so that any tiff files can be converted into LZ4 tiff.
From my small experiments, its compression ratio is better than LZW,
> but worse than ZIP. Predictor is nicely working with LZ4. My tiff > viewer shows
LZ4 tiff very fast compared to ZIP especially large tiff files. If
> someone want the code, I'd like to pick up two TAG values before > releasing it to avoid confusion.
#define COMPRESSION_LZ4 34926 /* LZ4 */
#define TIFFTAG_LZ4QUALITY 65564 /* LZ4 acceleration factor */
Are there any objections to pick up those values?
Yes! libtiff master uses 34926 for ZSTD codec: https://gitlab.com/libtiff/libtiff/blob/master/libtiff/tiff.h#L191