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man/cwebp.1: add note about crop/resize order

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+ normalize help text in [cd]webp

Bug: webp:561
Change-Id: Id92ec4228d4933cd033b2bf68a43192532cef483
This commit is contained in:
James Zern 2022-03-17 10:29:02 -07:00
parent f0e9351cce
commit 34bb332ca1
4 changed files with 12 additions and 10 deletions
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4
doc/tools.md
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@ -64,7 +64,7 @@ Options:
-qrange <min> <max> .... specifies the permissible quality range
(default: 0 100)
-crop <x> <y> <w> <h> .. crop picture with the given rectangle
-resize <w> <h> ........ resize picture (after any cropping)
-resize <w> <h> ........ resize picture (*after* any cropping)
-mt .................... use multi-threading if available
-low_memory ............ reduce memory usage (slower encoding)
-map <int> ............. print map of extra info
@ -181,7 +181,7 @@ Other options are:
-alpha_dither use alpha-plane dithering if needed
-mt .......... use multi-threading
-crop <x> <y> <w> <h> ... crop output with the given rectangle
-resize <w> <h> ......... scale the output (*after* any cropping)
-resize <w> <h> ......... resize output (*after* any cropping)
-flip ........ flip the output vertically
-alpha ....... only save the alpha plane
-incremental . use incremental decoding (useful for tests)

2
examples/cwebp.c
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@ -571,7 +571,7 @@ static void HelpLong(void) {
printf(" -qrange <min> <max> .... specifies the permissible quality range\n"
" (default: 0 100)\n");
printf(" -crop <x> <y> <w> <h> .. crop picture with the given rectangle\n");
printf(" -resize <w> <h> ........ resize picture (after any cropping)\n");
printf(" -resize <w> <h> ........ resize picture (*after* any cropping)\n");
printf(" -mt .................... use multi-threading if available\n");
printf(" -low_memory ............ reduce memory usage (slower encoding)\n");
printf(" -map <int> ............. print map of extra info\n");

2
examples/dwebp.c
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@ -96,7 +96,7 @@ static void Help(void) {
" -alpha_dither use alpha-plane dithering if needed\n"
" -mt .......... use multi-threading\n"
" -crop <x> <y> <w> <h> ... crop output with the given rectangle\n"
" -resize <w> <h> ......... scale the output (*after* any cropping)\n"
" -resize <w> <h> ......... resize output (*after* any cropping)\n"
" -flip ........ flip the output vertically\n"
" -alpha ....... only save the alpha plane\n"
" -incremental . use incremental decoding (useful for tests)\n"

14
man/cwebp.1
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@ -1,5 +1,5 @@
.\" Hey, EMACS: -*- nroff -*-
.TH CWEBP 1 "November 17, 2021"
.TH CWEBP 1 "March 17, 2022"
.SH NAME
cwebp \- compress an image file to a WebP file
.SH SYNOPSIS
@ -90,15 +90,17 @@ additional encoding possibilities and decide on the quality gain.
Lower value can result in faster processing time at the expense of
larger file size and lower compression quality.
.TP
.BI \-resize " width height
Resize the source to a rectangle with size \fBwidth\fP x \fBheight\fP.
If either (but not both) of the \fBwidth\fP or \fBheight\fP parameters is 0,
the value will be calculated preserving the aspect\-ratio.
.TP
.BI \-crop " x_position y_position width height
Crop the source to a rectangle with top\-left corner at coordinates
(\fBx_position\fP, \fBy_position\fP) and size \fBwidth\fP x \fBheight\fP.
This cropping area must be fully contained within the source rectangle.
Note: the cropping is applied \fIbefore\fP any scaling.
.TP
.BI \-resize " width height
Resize the source to a rectangle with size \fBwidth\fP x \fBheight\fP.
If either (but not both) of the \fBwidth\fP or \fBheight\fP parameters is 0,
the value will be calculated preserving the aspect\-ratio. Note: scaling
is applied \fIafter\fP cropping.
.TP
.B \-mt
Use multi\-threading for encoding, if possible.