JPEG Quant Smooth - JPEG artifacts removal

Copyright

       Copyright (C) 2016-2021 Ilya Kurdyukov

JPEG Quant Smooth                                  08 Apr 2021                                         jpegqs(1)

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).

Name

JPEGQuantSmooth - JPEG artifacts removal

Options

-q,--qualityn
              Quality setting (0-6, default is 3)/home/rainbow/Desktop/pngtest/jpegrestore/jpegqs.1

       -n,--nitern
              Number of iterations (default is 3)

              * More iterations can make the result look like CG art, can make the photos look unnatural.

       -t,--threadsn
              Set the number of CPU threads to use

       -o,--optimize
              Option for libjpeg to produce smaller output file

       -v,--verbosen
              Print libjpeg debug output

       -i,--infon
              Print quantsmooth debug output (default is 15).
              Use the sum of flags:
                     0 - silent
                     1/2/4 - various information
                     8 - processing time
                     16 - SIMD type

              * The processing time includes only the smoothing algorithm, jpeg reading and writing time is  not
              included.

       -p,--cpun
              Use to lower the SIMD type if CPU detection fails:
                     0 - auto
                     1 - scalar
                     2 - SSE2
                     3 - AVX2
                     4 - AVX512

              * x86 build selects between modes 1-3, x86_64 from 2-4

Project Page

       https://github.com/ilyakurdyukov/jpeg-quantsmooth

Quality

       The quality setting sets a combination of flags for processing:

       3. default

       4. adds DIAGONALS flag
              smoother diagonal edges, ~1.5 times slower

       5. adds JOINT_YUV flag
              chroma channels will depend from luminance, better color consistency

       6. adds UPSAMPLE_UV flag
              non-blurring chroma upsampling, unlike fancy upsampling from libjpeg

       levels 0-2 is the same as 4-6, but with LOW_QUALITY flag
       ~10 times faster, but the quality is lower
       LOW_QUALITY implies DIAGONALS (always set)