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.