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This commit is contained in:
John Cupitt 2016-05-09 11:07:48 +01:00
parent 54e5cb04d3
commit 143593d6a6
3 changed files with 15 additions and 9 deletions
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1
ChangeLog
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@ -1,5 +1,6 @@
1/5/16 started 8.4
- many more wepsave options [Felix Bünemann]
- added quant_table option to wepsave [Felix Bünemann]
15/4/16 started 8.3.1
- rename vips wrapper script, it was still vips-8.2, thanks Benjamin

21
libvips/foreign/foreign.c
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@ -2272,15 +2272,18 @@ vips_jpegload_buffer( void *buf, size_t len, VipsImage **out, ... )
* If @quant_table is set and the version of libjpeg supports it
* (e.g. mozjpeg >= 3.0) it selects the quantization table to use:
*
* * 0 Tables from JPEG Annex K (vips and libjpeg default)
* * 1 Flat table
* * 2 Table tuned for MSSIM on Kodak image set
* * 3 Table from ImageMagick by N. Robidoux (current mozjpeg default)
* * 4 Table tuned for PSNR-HVS-M on Kodak image set
* * 5 Table from Relevance of Human Vision to JPEG-DCT Compression (1992)
* * 6 Table from DCTune Perceptual Optimization of Compressed Dental X-Rays (1997)
* * 7 Table from A Visual Detection Model for DCT Coefficient Quantization (1993)
* * 8 Table from An Improved Detection Model for DCT Coefficient Quantization (1993)
* * 0 — Tables from JPEG Annex K (vips and libjpeg default)
* * 1 — Flat table
* * 2 — Table tuned for MSSIM on Kodak image set
* * 3 — Table from ImageMagick by N. Robidoux (current mozjpeg default)
* * 4 — Table tuned for PSNR-HVS-M on Kodak image set
* * 5 — Table from Relevance of Human Vision to JPEG-DCT Compression (1992)
* * 6 — Table from DCTune Perceptual Optimization of Compressed Dental
* X-Rays (1997)
* * 7 — Table from A Visual Detection Model for DCT Coefficient
* Quantization (1993)
* * 8 — Table from An Improved Detection Model for DCT Coefficient
* Quantization (1993)
*
* Quantization table 0 is the default in vips and libjpeg(-turbo), but it
* tends to favor detail over color accuracy, producting colored patches and

2
libvips/foreign/vips2jpeg.c
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@ -74,6 +74,8 @@
* - don't write JFIF headers if we are stripping, thanks Benjamin
* 13/4/16
* - remove deleted exif fields more carefully
* 9/5/16 felixbuenemann
* - add quant_table
*/
/*