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Using quality (-q) with jp2 (-out jp2) has no effect
Posted: Tue Nov 11, 2003 6:46 am
by jedijorgie
I cannot get this to work:
nconvert -out jp2 -q 60 -o output.jp2 input.jp2
It creates output.jp2 just fine, but the quality is at 100%. In my tests I can put any number in place of the 60 and it does the same thing.
If I save the file with XnView with a quality setting of 60 the file goes from over 200K to 44k but looks just fine.
How do I get nconvert to save at the '60' quality level?
Jorgie
Re: Using quality (-q) with jp2 (-out jp2) has no effect
Posted: Wed Nov 12, 2003 2:50 pm
by xnview
Hello,
jedijorgie wrote:I cannot get this to work:
nconvert -out jp2 -q 60 -o output.jp2 input.jp2
It creates output.jp2 just fine, but the quality is at 100%. In my tests I can put any number in place of the 60 and it does the same thing.
If I save the file with XnView with a quality setting of 60 the file goes from over 200K to 44k but looks just fine.
How do I get nconvert to save at the '60' quality level?
Strange, i have tested with NConvert v4.11, and all is ok!
Regards. Pierre.
that is really strange
Posted: Wed Nov 12, 2003 8:55 pm
by jedijorgie
I just downloaded and reinstalled. Here is what I am seeing.
I started with
http://jorgie.org/initial.jpg which is
266,223 bytes.
I then ran:
nconvert.exe -out jp2 -q 60 -o nconvert60.jp2 initial.jpg
Which created
http://jorgie.org/nconvert60.jp2 which is
425,451 bytes!
I then opened that in XnView and saved it as XnView60.jp2 with the quality set to 60.
That created
http://jorgie.org/XnView60.jp2 whis is
71,061 bytes!
So I ask again, how do I get nconvert to output the 71,061 version of the file that XnView produces? Am I using the wrong setting with nconvert?
Jorgie
Re: that is really strange
Posted: Thu Nov 13, 2003 8:14 am
by xnview
Hello,
jedijorgie wrote:So I ask again, how do I get nconvert to output the 71,061 version of the file that XnView produces? Am I using the wrong setting with nconvert?
No, sorry, there is a little bug. Quality is not used (ratio 1:20 is used).
Regards. Pierre.
whew!
Posted: Thu Nov 13, 2003 8:24 pm
by jedijorgie
Well at least I know I am not going crazy!!!
Any idea when you will get a chance to fix it?
Thanks for the great programs!
Jorgie
Posted: Fri Mar 19, 2004 11:37 am
by artwork
It looks like this bug still present in NConvert 4.17.
Any Idea when it`ll be fixed ?
Or is there any other way to pass the quality settings to NConvert ?
Kind Regards,
Markus
Posted: Fri Mar 19, 2004 11:44 am
by artwork
And would it be possible that the option -q would be passed to the lwfjp2 format too ?
Seems that this format always uses a quality setting of 100% (when compring the images in Photoshop using Difference)
Markus
