.TH TJBENCH "1" "July 2014" "tjbench " "User Commands"
.SH NAME
tjbench \- benchmark the performance of libjpeg-turbo
.SH USAGE
tjbench <Inputfile (BMP|PPM)> <Quality> [options]
.PP
tjbench <Inputfile (JPG)> [options]
.SH OPTIONS
\fB\-alloc\fR
.IP
Dynamically allocate JPEG image buffers
.PP
\fB\-bmp\fR
.IP
Generate output images in Windows Bitmap format (default=PPM)
.PP
\fB\-bottomup\fR
.IP
Test bottom\-up compression/decompression
.PP
\fB\-tile\fR
.IP
Test performance of the codec when the image is encoded as separate tiles of varying sizes.
.PP
\fB\-forcemmx\fR, \fB\-forcesse\fR, \fB\-forcesse2\fR, \fB\-forcesse3\fR
.IP
Force MMX, SSE, SSE2, or SSE3 code paths in the underlying codec
.PP
\fB\-rgb\fR, \fB\-bgr\fR, \fB\-rgbx\fR, \fB\-bgrx\fR, \fB\-xbgr\fR, \fB\-xrgb\fR
.IP
Test the specified color conversion path in the codec (default: BGR)
.PP
\fB\-fastupsample\fR
.IP
Use the fastest chrominance upsampling algorithm available in the
underlying codec
.PP
\fB\-fastdct\fR
.IP
Use the fastest DCT/IDCT algorithms available in the underlying codec
.PP
\fB\-accuratedct\fR
.IP
 Use the most accurate DCT/IDCT algorithms available in the underlying
codec
.PP
\fB\-subsamp\fR <s>
.IP
When testing JPEG compression, this option specifies the level of
chrominance subsampling to use (<s> = 444, 422, 440, 420, or GRAY).
The default is to test Grayscale, 4:2:0, 4:2:2, and 4:4:4 in sequence.
.PP
\fB\-quiet\fR
.IP
Output results in tabular rather than verbose format
.PP
\fB\-yuvencode\fR
.IP
Encode RGB input as planar YUV rather than compressing as JPEG
.PP
\fB\-yuvdecode\fR
.IP
Decode JPEG image to planar YUV rather than RGB
.PP
\fB\-scale\fR M/N
.IP
scale down the width/height of the decompressed 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)
.PP
\fB\-hflip\fR, \fB\-vflip\fR, \fB\-transpose\fR, \fB\-transverse\fR, \fB\-rot90\fR, \fB\-rot180\fR, \fB\-rot270\fR
.IP
Perform the corresponding lossless transform prior to
decompression (these options are mutually exclusive)
.PP
\fB\-grayscale\fR
.IP
Perform lossless grayscale conversion prior to decompression test (can
be combined with the other transforms above)
.PP
\fB\-benchtime\fR <t>
.IP
Run each benchmark for at least <t> seconds (default = 5.0)
.IP
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.
.PP