JPEG 'use estimated original quality' option

[cday]

A JPEG save compression option 'use estimated original quality' would be a useful addition please...

[xnview]

ok, will be added

[Peter2]

See version 2.49.5, Feb 02, 2021

[Peter2]

@Pierre

please add this info also to the "-help" section. At the moment there is only:

Code: Select all

-q value          : JPEG/FPX/WIC/PDF/JPEG2K quality (default : 85)

[Peter2]

BTW: How to use it? I failed ...

[cday]

BTW: How to use it? I failed ...

Using -use_org_quality in place of a -q term doesn't work?

Such as:

Code: Select all

-out jpeg -use_org_quality

[Peter2]

My code is longer, and it seems to have problems with params following the -use_org_quality.
But finally it creates a file - but not the one I defined ..

Defined quality:

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D:\xxx\foto>nconvert.exe -keepfiledate -q 100 -out jpeg -jpegtrans exif -exif_orient 1  -o "D:\xxx\foto\q100.jpg"   "D:\xxx\foto\source.JPG"
** NCONVERT v7.70 (c) 1991-2019 Pierre-E Gougelet (Feb  1 2021/10:49:07) **
        Version for Windows NT/9x/2000/Xp/Vista/7  (All rights reserved)
** This is freeware software (for non-commercial use)

Lossless transformation of D:\xxx\foto\source.JPG : OK

Original quality:

Code: Select all

D:\xxx\foto>nconvert.exe -keepfiledate -use_org_quality -out jpeg -jpegtrans exif -exif_orient 1  -o "D:\xxx\foto\orig.jpg"   "D:\xxx\foto\source.JPG"
** NCONVERT v7.70 (c) 1991-2019 Pierre-E Gougelet (Feb  1 2021/10:49:07) **
        Version for Windows NT/9x/2000/Xp/Vista/7  (All rights reserved)
** This is freeware software (for non-commercial use)

  Error: Can't open file (jpeg)
  Error: Can't open file (-jpegtrans)
  Error: Can't open file (exif)
  Error: Can't open file (-exif_orient)
  Error: Can't open file (1)
  Error: Can't open file (-o)
  Error: Can't open file (D:\xxx\foto\orig.jpg)

Conversion of D:\xxx\foto\source.JPG into D:\xxx\foto\source_1.jpg OK

[xnview]

there is a problem with 'use_org_quality' argument, and there is no need to use it with -jpegtrans (quality is not changed)

[Peter2]

there is a problem with 'use_org_quality' argument, and there is no need to use it with -jpegtrans (quality is not changed)

You mean there is a problem which you will fix or which can be avoided by the user?

[xnview]

there is a problem with 'use_org_quality' argument, and there is no need to use it with -jpegtrans (quality is not changed)

You mean there is a problem which you will fix or which can be avoided by the user?

yes will be fixed

[Peter2]

Hello Pierre
some schedule for a fix?

[xnview]

new version will be released in september