< snip >

> But a much better and simpler idea is to just use a
> number range from 1..13, similar to photoshop.
> 
> I'll take that over to the developer's list.

Is this any help, I came across it a long time ago?

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
Adobe Photoshop quality 11  <=  GIMP quality 95, subsampling 1x1
Adobe Photoshop quality 10  <=  GIMP quality 93, subsampling 1x1
Adobe Photoshop quality 9   <=  GIMP quality 91, subsampling 1x1
Adobe Photoshop quality 8   <=  GIMP quality 90, subsampling 1x1
Adobe Photoshop quality 7   <=  GIMP quality 89, subsampling 1x1
Adobe Photoshop quality 6   <=  GIMP quality 90, subsampling 2x2
Adobe Photoshop quality 5   <=  GIMP quality 89, subsampling 2x2
Adobe Photoshop quality 4   <=  GIMP quality 88, subsampling 2x2
Adobe Photoshop quality 3   <=  GIMP quality 88, subsampling 2x2
Adobe Photoshop quality 2   <=  GIMP quality 87, subsampling 2x2
Adobe Photoshop quality 1   <=  GIMP quality 86, subsampling 2x2
Adobe Photoshop quality 0   <=  GIMP quality 85, subsampling 2x2

Norman

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