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| .TH jpegqs 1 "08 Apr 2021" "JPEG Quant Smooth" | ||
| .SH NAME | ||
| .B JPEG Quant Smooth | ||
| \- JPEG artifacts removal | ||
| .SH DESCRIPTION | ||
| This program tries to recover the lost precision of DCT coefficients | ||
| based on a quantization table from a JPEG image. The result is saved | ||
| as a JPEG image with quantization set to 1 (like a JPEG saved at 100% | ||
| quality). | ||
| .SH SYNOPSIS | ||
| .B jpegqs | ||
| .IR "" [ options ] | ||
| .I input.jpg | ||
| .I output.jpg | ||
| .SH OPTIONS | ||
| .TP | ||
| .B \-q, \-\-quality n | ||
| Quality setting (0\-6, default is 3)/home/rainbow/Desktop/pngtest/jpegrestore/jpegqs.1 | ||
| .TP | ||
| .B \-n, \-\-niter n | ||
| Number of iterations (default is 3) | ||
| .IP | ||
| * More iterations can make the result look like CG art, can make the photos look unnatural. | ||
| .TP | ||
| .B \-t, \-\-threads n | ||
| Set the number of CPU threads to use | ||
| .TP | ||
| .B \-o, \-\-optimize | ||
| Option for libjpeg to produce smaller output file | ||
| .TP | ||
| .B \-v, \-\-verbose n | ||
| Print libjpeg debug output | ||
| .TP | ||
| .B \-i, \-\-info n | ||
| Print quantsmooth debug output (default is 15). | ||
| .RS | ||
| Use the sum of flags: | ||
| .RS | ||
| 0 \- silent | ||
| .RE | ||
| .RS | ||
| 1/2/4 \- various information | ||
| .RE | ||
| .RS | ||
| 8 \- processing time | ||
| .RE | ||
| .RS | ||
| 16 \- SIMD type | ||
| .RE | ||
| .PP | ||
| * The processing time includes only the smoothing algorithm, jpeg reading and writing time is not included. | ||
| .RE | ||
| .TP | ||
| .B \-p, \-\-cpu n | ||
| Use to lower the SIMD type if CPU detection fails: | ||
| .RS | ||
| .RS | ||
| 0 \- auto | ||
| .RE | ||
| .RS | ||
| 1 \- scalar | ||
| .RE | ||
| .RS | ||
| 2 \- SSE2 | ||
| .RE | ||
| .RS | ||
| 3 \- AVX2 | ||
| .RE | ||
| .RS | ||
| 4 \- AVX512 | ||
| .RE | ||
| .PP | ||
| * x86 build selects between modes 1\-3, x86_64 from 2\-4 | ||
| .RE | ||
| .SH QUALITY | ||
| .TP | ||
| The quality setting sets a combination of flags for processing: | ||
| .TP | ||
| 3. default | ||
| .TP | ||
| 4. adds DIAGONALS flag | ||
| smoother diagonal edges, ~1.5 times slower | ||
| .TP | ||
| 5. adds JOINT_YUV flag | ||
| chroma channels will depend from luminance, better color consistency | ||
| .TP | ||
| 6. adds UPSAMPLE_UV flag | ||
| non-blurring chroma upsampling, unlike fancy upsampling from libjpeg | ||
| .TP | ||
| levels 0\-2 is the same as 4\-6, but with LOW_QUALITY flag | ||
| .RS | ||
| .RE | ||
| ~10 times faster, but the quality is lower | ||
| .RS | ||
| .RE | ||
| LOW_QUALITY implies DIAGONALS (always set) | ||
| .SH PROJECT PAGE | ||
| .TP | ||
| https://github.com/ilyakurdyukov/jpeg\-quantsmooth | ||
| .SH COPYRIGHT | ||
| .TP | ||
| Copyright (C) 2016\-2021 Ilya Kurdyukov |