TJBENCH(1) User Commands TJBENCH(1)
NAME
tjbench - benchmark the performance of libjpeg-turbo
DESCRIPTION
tjbench is a JPEG decompression/compression benchmark part of libjpeg-
turbo.
USAGE
tjbench <Inputimage (BMP|PPM)> <Quality> [options]
tjbench <Inputimage (JPG)> [options]
OPTIONS
-alloc = Dynamically allocate JPEG buffers -bmp = Use Windows Bitmap
format for output images [default = PPM] -bottomup = Use bottom-up row
order for packed-pixel source/destination buffers -tile = Com-
press/transform the input image into separate JPEG tiles of varying
sizes (useful for measuring JPEG overhead)
-rgb, -bgr, -rgbx, -bgrx, -xbgr, -xrgb =
Use the specified pixel format for packed-pixel source/destina-
tion buffers [default = BGR]
-cmyk = Indirectly test YCCK JPEG compression/decompression
(use the CMYK pixel format for packed-pixel source/destination
buffers)
-fastupsample = Use the fastest chrominance upsampling algorithm avail-
able -fastdct = Use the fastest DCT/IDCT algorithm available -accurat-
edct = Use the most accurate DCT/IDCT algorithm available -progressive
= Use progressive entropy coding in JPEG images generated by
compression and transform operations
-subsamp <s> = When compressing, use the specified level of chrominance
subsampling (<s> = 444, 422, 440, 420, 411, or GRAY) [default =
test Grayscale, 4:2:0, 4:2:2, and 4:4:4 in sequence]
-quiet = Output results in tabular rather than verbose format -yuv =
Compress from/decompress to intermediate planar YUV images -yuvpad <p>
= The number of bytes by which each row in each plane of an
intermediate YUV image is evenly divisible (must be a power of
2) [default = 1]
-scale M/N = When decompressing, scale the width/height of the JPEG im-
age by a
factor of M/N (M/N = 2/1, 15/8, 7/4, 13/8, 3/2, 11/8, 5/4, 9/8,
1/1, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, or 1/8)
-hflip, -vflip, -transpose, -transverse, -rot90, -rot180, -rot270 =
Perform the specified lossless transform operation on the input
image prior to decompression (these operations are mutually ex-
clusive)
-grayscale = Transform the input image into a grayscale JPEG image
prior to
decompression (can be combined with the other transform opera-
tions above)
-copynone = Do not copy any extra markers (including EXIF and ICC pro-
file data)
when transforming the input image
-benchtime <t> = Run each benchmark for at least <t> seconds [default =
5.0] -warmup <t> = Run each benchmark for <t> seconds [default = 1.0]
prior to
starting the timer, in order to prime the caches and thus im-
prove the consistency of the benchmark results
-componly = Stop after running compression tests. Do not test decom-
pression. -nowrite = Do not write reference or output images (improves
consistency of
benchmark results)
-limitscans = Refuse to decompress or transform progressive JPEG images
that
have an unreasonably large number of scans
-stoponwarning = Immediately discontinue the current
compression/decompression/transform operation if a warning
(non-fatal error) occurs
NOTE: If the quality is specified as a range (e.g. 90-100), a separate
test will be performed for all quality values in the range.
COMMENT
This manual page was written by Mathieu Malaterre <malat@debian.org>
for the Debian GNU/Linux system, but may be used by others.
COPYRIGHT
Copyright (C)2009-2019, 2021 D. R. Commander. All Rights Reserved.
tjbench 2.1.5 February 2023 TJBENCH(1)
Generated by dwww version 1.15 on Mon Jun 24 13:26:20 CEST 2024.