Re: [Gimp-print-devel] Question about internal color conversion and gamma flow

[Robert K. <rl...@al...>]

On Fri, 13 Sep 2019 10:00:50 -0400, Solomon Peachy wrote:
> On Wed, Sep 11, 2019 at 11:35:15PM -0400, Solomon Peachy wrote:
>> If the hanful of test prints I've made so fare are any indication, it's 
>> definitely for the better (color test charts are visibly improved) but 
>> it's still a non-trivial change in output.
>
> I've now tested five printers from three manufacturers; the output is 
> visibly improved with all of them, with better contrast and tonal range 
> across the board.  

This sounds very much like the problem we had with color laser
printers early on, and as I recall.

I'm not a huge fan of changing color output of stable printers during
a release train, but this is more of a bug, and I think fixing it is
the right thing to do.

> As an added bonus, when using the manufacturer ICC profiles the outputs 
> are finally consistent with each other!
>
> So I've commited the change.
>
> But since this change represents a significant change in output, I added 
> an option to revert to the old behavior, defaulting to off.  If the 
> user enables "LegacyDyesubGamma", the dyesub driver will revert to the 
> old behavior.
>
> ...I still need to document this change in the NEWS file though.

-- 
Robert Krawitz                                     <rl...@al...>

***  MIT Engineers   A Proud Tradition   http://mitathletics.com  ***
Member of the League for Programming Freedom  --  http://ProgFree.org
Project lead for Gutenprint   --    http://gimp-print.sourceforge.net

"Linux doesn't dictate how I work, I dictate how Linux works."
--Eric Crampton