NAME¶

JPEG Quant Smooth - JPEG artifacts removal

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).

SYNOPSIS¶

jpegqs [options] input.jpg output.jpg

OPTIONS¶

-q, --quality n

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

-n, --niter n

Number of iterations (default is 3)

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

-t, --threads n

Set the number of CPU threads to use

-o, --optimize

Option for libjpeg to produce smaller output file

-v, --verbose n

Print libjpeg debug output

-i, --info n

Print quantsmooth debug output (default is 15).

-p, --cpu n

Use to lower the SIMD type if CPU detection fails:

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

PROJECT PAGE¶

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

COPYRIGHT¶

Copyright (C) 2016-2021 Ilya Kurdyukov