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Make discarding invisible RGB values (cleanup alpha) the default.

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Rename the flag to exact instead of the opposite cleanup_alpha. Add the flag to
WebPConfig. Do the cleanup in the webp encoder library rather than the cwebp
binary, this will be needed for the next stage: smarter alpha cleanup for
better compression which cannot be done as a preprocessing due to depending on
predictor choices in the encoder.

Change-Id: I2fbf57f918a35f2da6186ef0b5d85e5fd0020eef
This commit is contained in:
Lode Vandevenne
2015-11-16 13:14:57 +00:00
committed by James Zern
parent b37b0179c5
commit 1f9be97c22
6 changed files with 24 additions and 13 deletions
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README
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@@ -181,7 +181,7 @@ Options:
-alpha_method <int> .... transparency-compression method (0..1)
-alpha_filter <string> . predictive filtering for alpha plane,
one of: none, fast (default) or best
-alpha_cleanup ......... clean RGB values in transparent area
-exact ................. preserve RGB values in transparent area
-blend_alpha <hex> ..... blend colors against background color
expressed as RGB values written in
hexadecimal, e.g. 0xc0e0d0 for red=0xc0