Re: [Gimp-print-devel] MG8220 color tuning help

[Gernot H. <aik...@gm...>]

On Wed, May 7, 2014 at 3:47 PM, Andrew Mahone <and...@gm...>wrote:

> I can't get acceptable output from my MG8220 with gutenprint-cvs without
> using ColorModel=CMYK. Colors are too dark, greys are noticeably colored
> and too light until some cutoff point at which they become solid black (top
> is CMYK, bottom is RGB: http://imgur.com/peltIaA ). How can I best help
> to adjust print with ColorModel=RGB, which I understand is supposed to be
> the preferred method? I have some time and quite a bit of paper and ink,
> and would like to do what I can to help. Any pointers on how to get started
> on support for more media or modes would be helpful as well.
>

Hello Andrew,
Unfortunately, only 1 of the Canon models is (somewhat) calibrated, the
iP4300. This calibration is used on a couple of models, but each model, and
each media in fact, requires its own calibration. Since this requires user
input, it is not possible to do this from the development side at the
moment. If you are able to compile gutenprint, it is possible to add
calibration matrices, support is there to add them per media and for the
printer as a whole. Currently the iP4300 example uses only calibration for
the printer as a whole.

If you feel you would like to try adding calibration matrices for hue,
luminescence and intensity, please let us know, the help would be much
appreciated.
In future, we hope that we can add support for doing such experimental work
without recompilation, using XML files.

Regards,
Gernot Hassenpflug