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File Name : heif-enc.1

.TH HEIF-ENC 1
.SH NAME
heif-enc \- convert image to HEIC/HEIF
.SH SYNOPSIS
.B heif-enc
[\fB\-h\fR|\fB--help\fR]
[\fB\-q\fR \fIQUALITY\fR|\fB--quality\fR \fIQUALITY\fR]
[\fB\-L\fR|\fB--lossless\fR]
[\fB\-t\fR \fISIZE\fR|\fB--thumb\fR \fISIZE\fR]
[\fB--no-alpha\fR]
[\fB--no-thumb-alpha\fR]
[\fB\-o\fR \fIFILENAME\fR|\fB--output\fR \fIFILENAME\fR]
[\fB\-v\fR|\fB--verbose\fR]
[\fB\-P\fR|\fB--params\fR]
[\fB\-b\fR \fIDEPTH\fR]
[\fB\-p\fR \fINAME\fR\fB=\fR\fIVALUE\fR]
.IR filename[.jpg|.png|.y4m]
.SH DESCRIPTION
.B heif-enc
Convert image to HEIC/HEIF.
.SH OPTIONS
.TP
.BR \-q\fR\ \fIQUALITY\fR ", " \-\-quality\fR\ \fIQUALITY\fR
Defines quality level between 0 and 100 for the generated output file.
.TP
.BR \-L ", "\-\-lossless\fR
Generate lossless output (\fB-q\fR has no effect)
.TP
.BR \-t\fR\ \fISIZE\fR ", " \-\-thumb\fR\ \fISIZE\fR
Generate thumbnail with maximum size \fISIZE\fR pixels (default: off).
.TP
.BR \-\-no-alpha\fR
Do not save alpha channel.
.TP
.BR \-\-no-thumb-alpha\fR
Do not save alpha channel in thumbnail image.
.TP
.BR \-o\fR\ \fIFILENAME\fR ", " \-\-output\fR\ \fIFILENAME\fR
Output filename (optional).
.TP
.BR \-\-verbose\fR
Enable logging output (more will increase logging level).
.TP
.BR \-P ", "\-\-params\fR
Show all encoder parameters and exit. Input file is not required or used.
.TP
.BR \-b\fR\ \fIDEPTH\fR
Bit-depth of generated HEIF file when using 16-bit PNG input (default: 10 bit).
.TP
.BR \-p\fR\ \fINAME\fR\fB=\fR\fIVALUE\fR
Set additional encoder parameters. See \fBNOTES\fR below.
.SH EXIT STATUS
.PP
\fB0\fR
.RS 4
Success
.RE
.PP
\fB1\fR
.RS 4
Failure (syntax or usage error; error while loading, converting or writing image).
.RE
.SH NOTES
The available input formats depend on the libraries that were available at
compile time. Supported are JPEG, PNG and Y4M, the file type is determined based
on the extension of the input file.

When specifying multiple source images, they will all be saved into the same
HEIF file.

When using the x265 encoder, you may pass it any of its parameters by
prefixing the parameter name with \fBx265:\fR.
Hence, to set the \fBctu\fR parameter, you will have to set \fBx265:ctu\fR
in libheif (e.g.: \fB-p x265:ctu=64\fR).

Note that there is no checking for valid parameters when using the prefix.
.SH BUGS
Please reports bugs or issues at https://github.com/strukturag/libheif
.SH AUTHORS
Dirk Farin, struktur AG
.SH COPYRIGHT
Copyright \[co] 2017 struktur AG

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-09-13 07:02:24
..	dir	-	root/root	0755	2024-03-03 07:11:11
heif-dec.1	text/troff	917 B	root/root	0644	2025-08-05 10:24:49
heif-enc.1	text/troff	2.38 KB	root/root	0644	2025-08-05 10:24:49
heif-info.1	text/troff	865 B	root/root	0644	2025-08-05 10:24:49
heif-thumbnailer.1	text/troff	736 B	root/root	0644	2025-08-05 10:24:49

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