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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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6
man/cwebp.1
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@ -247,9 +247,9 @@ mode will just try to form an a priori guess without testing all modes.
Specify the algorithm used for alpha compression: 0 or 1. Algorithm 0 denotes
no compression, 1 uses WebP lossless format for compression. The default is 1.
.TP
.B \-alpha_cleanup
Modify unseen RGB values under fully transparent area, to help compressibility.
The default is off.
.B \-exact
Preserve RGB values in transparent area. The default is off, to help
compressibility.
.TP
.BI \-blend_alpha " int
This option blends the alpha channel (if present) with the source using the