-rmeta reduces quality ?

Discussions on NConvert - the command line tool for image conversion and manipulation

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xenry
Posts: 3
Joined: Wed Sep 03, 2008 7:02 am

-rmeta reduces quality ?

Post by xenry »

hello and thanks for the wonderful xnview =)

I am trying to write a simple program that uses nconvert to remove jpeg metadata (exif and so on). So I call nconvert with:

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nconvert.exe -rmeta [filename]
all works fine, the metadata is removed, but the jpeg file is a lot smaller ( as filesize ), about 2-3 times. I was wondering whether after the metadata removal the jpeg is resaved with lower quality? Any suggestions will be appreciated. Thanks in advance =)
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xnview
Author of XnView
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Joined: Mon Oct 13, 2003 7:31 am
Location: France

Re: -rmeta reduces quality ?

Post by xnview »

Yes currently -rmeta doesn't work like clean in xnview, the picture is saved again
Pierre.
xenry
Posts: 3
Joined: Wed Sep 03, 2008 7:02 am

Post by xenry »

thanks for the answer
so is there any way to access xnview->edit->metadata->remove all metadata externally? or any other workaround for removing metadata without losing quality ?
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xnview
Author of XnView
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Post by xnview »

I'll add such option in next version
Pierre.
xenry
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Joined: Wed Sep 03, 2008 7:02 am

Post by xenry »

thanks for the great support !
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DOS386
Posts: 291
Joined: Sun Jun 11, 2006 2:43 pm

Post by DOS386 »

xnview wrote:I'll add such option in next version
:-)

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      -jpegtrans op     : JPEG lossless transformations
              rot90  : Rotate 90 degrees
              rot180 : Rotate 180 degrees
              rot270 : Rotate 270 degrees
              exif   : Use orientation EXIF tag
              vflip  : Flip vertical
              hflip  : Flip horizontal
          -jpegcrop x y w h : JPEG lossless crop
          -rmeta  : Remove Metadata (EXIF/IPTC/...) 
The bottom line is not yet lossless in 5.00 ...
There is indeed no WinZIP under my rock.
dadaniel
Posts: 10
Joined: Tue Nov 22, 2011 12:14 pm

Re: -rmeta reduces quality ?

Post by dadaniel »

And it's still not lossless :(