dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2025-07-13 06:24:27 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

Add descriptions of default configuration in help info.

Browse Source 
Change-Id: I43188fab5f57bd45aa3e564df52e36cc37b1bb2f
This commit is contained in:
Hui Su
2016-08-09 17:03:55 +00:00
committed by James Zern
parent 1269dc7cfb
commit 74f6f9e793
3 changed files with 34 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
README
View File

@ -220,8 +220,9 @@ assumed to be a PNG, JPEG, TIFF or WebP file.
Options:
-h / -help ............. short help
-H / -longhelp ......... long help
-q <float> ............. quality factor (0:small..100:big)
-alpha_q <int> ......... transparency-compression quality (0..100)
-q <float> ............. quality factor (0:small..100:big), default=75
-alpha_q <int> ......... transparency-compression quality (0..100),
default=100
-preset <string> ....... preset setting, one of:
default, photo, picture,
drawing, icon, text
@ -229,15 +230,15 @@ Options:
-z <int> ............... activates lossless preset with given
level in [0:fast, ..., 9:slowest]
-m <int> ............... compression method (0=fast, 6=slowest)
-segments <int> ........ number of segments to use (1..4)
-m <int> ............... compression method (0=fast, 6=slowest), default=4
-segments <int> ........ number of segments to use (1..4), default=4
-size <int> ............ target size (in bytes)
-psnr <float> .......... target PSNR (in dB. typically: 42)
-s <int> <int> ......... input size (width x height) for YUV
-sns <int> ............. spatial noise shaping (0:off, 100:max)
-f <int> ............... filter strength (0=off..100)
-sharpness <int> ....... filter sharpness (0:most .. 7:least sharp)
-sns <int> ............. spatial noise shaping (0:off, 100:max), default=50
-f <int> ............... filter strength (0=off..100), default=60
-sharpness <int> ....... filter sharpness (0:most .. 7:least sharp), default=0
-strong ................ use strong filter instead of simple (default)
-nostrong .............. use simple filter instead of strong
-partition_limit <int> . limit quality to fit the 512k limit on
@ -252,18 +253,18 @@ Options:
-print_ssim ............ prints averaged SSIM distortion
-print_lsim ............ prints local-similarity distortion
-d <file.pgm> .......... dump the compressed output (PGM file)
-alpha_method <int> .... transparency-compression method (0..1)
-alpha_method <int> .... transparency-compression method (0..1), default=1
-alpha_filter <string> . predictive filtering for alpha plane,
one of: none, fast (default) or best
-exact ................. preserve RGB values in transparent area
-exact ................. preserve RGB values in transparent area, default=off
-blend_alpha <hex> ..... blend colors against background color
expressed as RGB values written in
hexadecimal, e.g. 0xc0e0d0 for red=0xc0
green=0xe0 and blue=0xd0
-noalpha ............... discard any transparency information
-lossless .............. encode image losslessly
-lossless .............. encode image losslessly, default=off
-near_lossless <int> ... use near-lossless image
preprocessing (0..100=off)
preprocessing (0..100=off), default=100
-hint <string> ......... specify image characteristics hint,
one of: photo, picture or graph