[Gimp-developer] jpeg quality factor.

[gg at catking.net]

On Tue, 10 Jul 2007 01:58:50 +0200, Graeme Gill <graeme2 at argyllcms.com>  
wrote:

>
> On Mon, 09 Jul 2007 11:33:34 +0200, Tor Lillqvist <tml at iki.fi> wrote:
>
>> There are some scenarios in which blindly reusing the quality factor
>> guesstimated from loading an image is not a good idea, even if the
>> guesstimate is very accurate. (Which happens when the loaded image's
>> quantization tables exactly match the JPEG standard's sample tables
>> scaled in libjpeg's manner with said factor).
>
> Why try and merely match the tables ? Use them by default. Only
> replace them if the user changes quality settings.
>
> Graeme Gill.

Yes, I agree. I think that would be an additional improvement to gimp's  
jpeg quality. It may be somewhat more work that just deciding what  
jpeg_quality we should be using. Although futher improvement of the way  
gimp handles jpeg may calm some of the "let's stop the user working with  
jpeg" crowd.

Certainly it would be prefeable to improve the jpeg quality rather than  
crippling gimp and restricting the user.
(no pun intended)

/gg