---
name: "tjbench"
section: "1"
platform: "linux"
package: "libjpeg-turbo-progs"
version: "1:2.1.5-4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/tjbench"
---

# tjbench(1)

benchmark the performance of libjpeg-turbo

## 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** = Compress/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/destination 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 available **-fastdct** = Use the fastest DCT/IDCT algorithm available **-accuratedct** = 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 image 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 exclusive)

**-grayscale** = Transform the input image into a grayscale JPEG image prior to

-

  decompression (can be combined with the other transform operations above)

**-copynone** = Do not copy any extra markers (including EXIF and ICC profile 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 improve the consistency of the benchmark results

**-componly** = Stop after running compression tests.  Do not test decompression. **-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.