Norman Silverstone wrote:
> Here is a table that provides an approximate mapping between Photoshop
> quality levels and GIMP (actually IJG JPEG library) quality levels:
> 
> Adobe Photoshop quality 12  <=  GIMP quality 98, subsampling 1x1
[..]

wow, i grossly underestimated the influence of the advanced parameters:
Subsampling 1x1 ist even more important than the quality slider for
images with sharp edges..

In the meantime, i stumbled across a blog entry which also compares
Photoshop's 'save to web' results:
http://blogs.gnome.org/raphael/2007/10/23/mapping-jpeg-compression-levels-between-adobe-photoshop-and-gimp-24/


regards,
peter

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