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img2webp: add -sharp_yuv/-near_lossless

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Both are global settings. Modifying them at the frame level is left as a
follow up based on need.

Bug: b/272739498
Change-Id: If15256c052f73fe3df56be5e0095e76d9870cc0f
This commit is contained in:
jzern@google.com
2023-03-15 18:50:37 -07:00
committed by James Zern
parent d64e6d7d9d
commit 0825faa4c1
5 changed files with 34 additions and 3 deletions
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14
man/img2webp.1
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@ -1,5 +1,5 @@
.\" Hey, EMACS: -*- nroff -*-
.TH IMG2WEBP 1 "January 5, 2022"
.TH IMG2WEBP 1 "March 16, 2023"
.SH NAME
img2webp \- create animated WebP file from a sequence of input images.
.SH SYNOPSIS
@ -44,6 +44,18 @@ Mixed compression mode: optimize compression of the image by picking either
lossy or lossless compression for each frame heuristically. This global
option disables the local option \fB-lossy\fP and \fB-lossless\fP .
.TP
.BI \-near_lossless " int
Specify the level of near\-lossless image preprocessing. This option adjusts
pixel values to help compressibility, but has minimal impact on the visual
quality. It triggers lossless compression mode automatically. The range is 0
(maximum preprocessing) to 100 (no preprocessing, the default). The typical
value is around 60. Note that lossy with \fB\-q 100\fP can at times yield
better results.
.TP
.B \-sharp_yuv
Use more accurate and sharper RGB->YUV conversion if needed. Note that this
process is slower than the default 'fast' RGB->YUV conversion.
.TP
.BI \-loop " int
Specifies the number of times the animation should loop. Using '0'
means 'loop indefinitely'.