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gif2webp: Add a mixed compression mode

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When '-mixed' option is given, each frame would be heuristically chosen
to be
encoded using lossy or lossless compression.

The heuristic is based on the number of colors in the image:
- If num_colors <= 31, pick lossless compression
- If num_colors >= 194, pick lossy compression
- Otherwise, try both and pick the one that compresses better.

Change-Id: I908c73493ddc38e8db35b7b1959300569e6d3a97
This commit is contained in:
Urvang Joshi
2013-11-17 18:04:07 -08:00
parent 87cffcc3c9
commit 73f52133a1
4 changed files with 167 additions and 41 deletions
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6
man/gif2webp.1
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@ -1,5 +1,5 @@
.\" Hey, EMACS: -*- nroff -*-
.TH GIF2WEBP 1 "September 30, 2013"
.TH GIF2WEBP 1 "November 13, 2013"
.SH NAME
gif2webp \- Convert a GIF image to WebP
.SH SYNOPSIS
@ -28,6 +28,10 @@ Print the version number (as major.minor.revision) and exit.
.B \-lossy
Encode the image using lossy compression.
.TP
.B \-mixed
Mixed compression mode: optimize compression of the image by picking either
lossy or lossless compression for each frame heuristically.
.TP
.BI \-q " float
Specify the compression factor for RGB channels between 0 and 100. The default
is 75.