ImageInfo's setQuality doesnt seems to work

Hi,

I'm using Jmagick for ImageMagick 6.1.8

I'm tryin to lower the quality of a jpg, without altering
its size. My
guess is what i did in that snippet, without success : 

wImage = new MagickImage(); 

wImage.blobToImage( wInfo, wOut.toByteArray() );

wImage.setMagick( wMagick ); 

wImage.setCompression(CompressionType.JPEGCompression);

wImage.profileImage("*", null);

wImage.enhanceImage(); 

wInfo.setCompression(CompressionType.JPEGCompression);

wInfo.setQuality(10);

return wImage.imageToBlob( wInfo );

I've been able to apply many modification to the jpg with
success, but
'just' setting a different quality doesnt seems to work; The
result is
the same, in file size and human eye analysis.

Am i doing something wrong? Is the feature bugged? Why
setQuality on
ImageInfo and not on MagickImage?

Thanks a lot!

Mart.

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