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add -print_psnr and -print_ssim options to cwebp.

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These will report the 7x7-averaged PSNR or SSIM, using the
new internal function WebPPictureDistortion().
This is for information only. These flags have no encoding impact.

+misc opportunistic cosmetics

Change-Id: I64c0a7eca679134d39062e438886274b22bb643f
This commit is contained in:
Pascal Massimino
2012-01-20 07:20:56 -08:00
parent 2e3e8b2ef5
commit d61479f95b
7 changed files with 165 additions and 26 deletions
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2
README
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@ -148,6 +148,8 @@ options:
-crop <x> <y> <w> <h> .. crop picture with the given rectangle
-resize <w> <h> ........ resize picture (after any cropping)
-map <int> ............. print map of extra info.
-print_ssim ............ prints averaged SSIM distortion.
-print_psnr ............ prints averaged PSNR distortion.
-d <file.pgm> .......... dump the compressed output (PGM file).
-alpha_method <int> .... Transparency-compression method (0..1)
-alpha_filter <string> . predictive filtering for alpha plane.