heif-enc man page

heif-enc — convert image to HEIC/HEIF

Synopsis

heif-enc [-h|--help] [-q QUALITY|--quality QUALITY] [-L|--lossless] [-t SIZE|--thumb SIZE] [--no-alpha] [--no-thumb-alpha] [-o FILENAME|--output FILENAME] [-v|--verbose] [-P|--params] [-b DEPTH] [-p NAME=VALUE] filename[.jpg|.png|.y4m]

Description

heif-enc Convert image to HEIC/HEIF.

Options

-q QUALITY, --quality QUALITY

Defines quality level between 0 and 100 for the generated output file.

-L, --lossless

Generate lossless output (-q has no effect)

-t SIZE, --thumb SIZE

Generate thumbnail with maximum size SIZE pixels (default: off).

--no-alpha

Do not save alpha channel.

--no-thumb-alpha

Do not save alpha channel in thumbnail image.

-o FILENAME, --output FILENAME

Output filename (optional).

-v, --verbose

Enable logging output (more -v will increase logging level).

-P, --params

Show all encoder parameters.

-b DEPTH

Bit-depth of generated HEIF file when using 16-bit PNG input (default: 10 bit).

-p NAME=VALUE

Set additional encoder parameters. See Notes below.

Exit Status

0

Success

1

Failure (syntax or usage error; error while loading, converting or writing image).

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 x265:. Hence, to set the ctu parameter, you will have to set x265:ctu in libheif (e.g.: -p x265:ctu=64).

Note that there is no checking for valid parameters when using the prefix.

Bugs

Please reports bugs or issues at https://github.com/strukturag/libheif

Authors

Dirk Farin, struktur AG