Provided by: libjxl-devtools_0.11.1-6ubuntu1.1_amd64 
NAME
benchmark_xl - benchmark_xl
SYNOPSIS
benchmark_xl [OPTIONS...]
DESCRIPTION
benchmark_xl v0.11.1 [AVX2,SSE4,SSE2]
--input=<string>
File or file pattern matching input files.
--codec=<string>
Comma separated list of image codec descriptions to benchmark.
--print_details
--noprint_details
Prints size and distortion for each image. Not safe for concurrent benchmark runs.
--print_details_csv
--noprint_details_csv
When print_details is used, print as CSV.
--extra_metrics=<string>
Extra metrics to be computed. Only displayed with --print_details or --print_details_csv.
Comma-separated list of NAME:COMMAND pairs; COMMAND is invoked with the original image as the
first argument, the decompressed image as a second argument, and the name of the file where to
write the metric value (as a single floating point number) as the third argument.
--print_more_stats
--noprint_more_stats
Prints codec-specific stats. Not safe for concurrent benchmark runs.
--print_distance_percentiles
--noprint_distance_percentiles
Prints distance percentiles for the corpus. Not safe for concurrent benchmark runs.
--silent_errors
--nosilent_errors
If true, doesn't print error messages on compression or decompression errors. Errors counts are
still visible in the 'Errors' column of the result table. Please note that depending depending on
the JXL build settings, error messages and asserts from within the codec may be printed
irrespective of this flag anyway, use release build to ensure no messages.
--save_compressed
--nosave_compressed
Saves the compressed files for each input image and each codec.
--save_decompressed
--nosave_decompressed
Saves the decompressed files as PNG for each input image and each codec.
--output_extension=<string>
Extension (starting with dot) to use for saving output images.
--output_description=<string>
Color encoding (see ParseDescription; e.g. RGB_D65_SRG_Rel_709) for saving output images,
defaults to sRGB.
--intensity_target=<scalar>
Intended viewing intensity target in nits. Defaults to 255 for SDR images, 4000 for HDR images
(when the input image uses PQ or HLG transfer function)
--dec-hints=<string>
Color encoding hints for the input images to encoder. Comma separated key=value pairs. The key
color_space indicates ColorEncoding (see ParseDescription; e.g. RGB_D65_SRG_Rel_709) for input
images without color encoding (such as PNM)
--override_bitdepth=<unsigned>
If nonzero, store the given bit depth in the JPEG XL file metadata (1-32), instead of using the
bit depth from the original input image.
--mul_output=<scalar>
If nonzero, multiplies linear sRGB by this and clamps to 255
--save_heatmap
--nosave_heatmap
Saves the heatmap images.
--heatmap_good=<scalar>
If greater than zero, use this as the good threshold for creating heatmap images.
--heatmap_bad=<scalar>
If greater than zero, use this as the bad threshold for creating heatmap images.
--write_html_report
--nowrite_html_report
Creates an html report with original and compressed images.
--html_report_self_contained
--nohtml_report_self_contained
Base64-encode the images in the HTML report rather than use external file names. May cause very
large HTML data size.
--html_report_use_decompressed
--nohtml_report_use_decompressed
Show the compressed image as decompressed to --output_extension.
--html_report_add_heatmap
--nohtml_report_add_heatmap
Add heatmaps to the image comparisons.
--markdown
--nomarkdown
Adds formatting around ASCII table to render correctly in Markdown based interfaces
--more_columns
--nomore_columns
Print extra columns in the table
--originals_url=<string>
Url prefix to serve original images from in the html report.
--output_dir=<string>
If not empty, save compressed and decompressed images here.
--num_threads=<integer>
The number of threads for concurrent benchmarking. Defaults to 1 thread per CPU core (if
negative).
--inner_threads=<integer>
The number of extra threads per task. Defaults to occupy cores (if negative).
--encode_reps=<unsigned>
How many times to encode (>1 for more precise measurements). Defaults to 1.
--decode_reps=<unsigned>
How many times to decode (>1 for more precise measurements). Defaults to 1.
--sample_tmp_dir=<string>
Directory to put samples from input images.
--num_samples=<integer>
How many sample areas to take.
--sample_dimensions=<integer>
How big areas to sample from the input.
--error_pnorm=<scalar>
smallest p norm for pooling butteraugli values
--show_progress
--noshow_progress
Show activity dots per completed file during benchmark.
--skip_butteraugli
--noskip_butteraugli
If true, doesn't compute distance metrics, only compression and decompression speed and size.
Distance numbers shown in the table are invalid.
--decode_only
--nodecode_only
If true, only decodes, and the input files must be compressed with a compatible format for the
given codec(s). Only measures decompression speed and sizes, and can only use a single set of
compatible decoders. Distance numbers and compression speeds shown in the table are invalid.
--generations=<unsigned>
If nonzero, enables generation loss testing with this number of intermediate generations. That is,
the decoded image gets re-encoded, iteratively, N times.
--custom_codec_extension=<string>
Converts input and output of codec to this file type (default: png).
--custom_codec_colorspace=<string>
If not empty, converts input and output of codec to this colorspace.
--custom_codec_quiet
--nocustom_codec_quiet
Whether stdin and stdout of custom codec should be shown.
--qprogressive
--noqprogressive
Enable quantized progressive mode for AC.
--progressive
--noprogressive
Enable progressive mode for AC.
--progressive_dc=<integer>
Enable progressive mode for DC.
--noise=0|1
Enable(1)/disable(0) noise generation.
--dots=0|1
Enable(1)/disable(0) dots generation.
--patches=0|1
Enable(1)/disable(0) patch dictionary.
--debug_image_dir=<string>
If not empty, saves debug images for each input image and each codec that provides it to this
directory.
--qtables=<string>
Custom base quantization tables.
--search_q_start=<scalar>
Starting quality for quality-to-target search
--search_q_min=<scalar>
Minimum quality for quality-to-target search
--search_q_max=<scalar>
Maximum quality for quality-to-target search
--search_d_min=<scalar>
Minimum distance for quality-to-target search
--search_d_max=<scalar>
Maximum distance for quality-to-target search
--search_tolerance=<scalar>
Percentage value, if quality-to-target search result relative error is within this, search stops.
--search_q_precision=<scalar>
If last quality change in quality-to-target search is within this value, search stops.
--search_first_iter_slope=<scalar>
Slope of first extrapolation step in quality-to-target search.
--search_max_iters=<integer>
Maximum search steps in quality-to-target search.
--avif_chroma_subsampling=444/422/420/400
default AVIF chroma subsampling (default: 444).
-h, --help
Prints this help message. All options are shown above.
AUTHOR
This manual page was written by Mathieu Malaterre <malat@debian.org> for the Debian GNU/Linux system (but
may be used by others).
benchmark_xl 0.11.1 March 2026 BENCHMARK_XL(1)