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gif2webp: add -sharp_yuv/-near_lossless

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This change is the same as the one that introduced the options to
img2webp:
0825faa4 img2webp: add -sharp_yuv/-near_lossless

Change-Id: Id380d159299c38dd6440f833d487e00c0976afec
This commit is contained in:
James Zern
2024-11-04 12:21:40 -08:00
parent dfdcb7f95c
commit f999d94f4a
5 changed files with 33 additions and 3 deletions
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14
man/gif2webp.1
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@ -1,5 +1,5 @@
.\" Hey, EMACS: -*- nroff -*-
.TH GIF2WEBP 1 "July 18, 2024"
.TH GIF2WEBP 1 "November 4, 2024"
.SH NAME
gif2webp \- Convert a GIF image to WebP
.SH SYNOPSIS
@ -39,6 +39,18 @@ Encode the image using lossy compression.
Mixed compression mode: optimize compression of the image by picking either
lossy or lossless compression for each frame heuristically.
.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. Note that this process is
slower than the default 'fast' RGB->YUV conversion.
.TP
.BI \-q " float
Specify the compression factor for RGB channels between 0 and 100. The default
is 75.