[Gimp-print-devel] New dither codes

[Thorsten S. <tho...@sc...>]

Hi,

I've done some testing of the new dither codes on my old stylus 440. All
in all, they look much better than what they used to, but there are
still problems.

360 dpi:

hybrid FS and adaptive hybrid: some artefacts in a ligt area next to a
dark one: I get a row of black pixels just next to the dark area.

random FS and adaptive random: zigzag lines in dark-grey areas (greenish
and reddish ones). 

I don't see much difference between the adaptive and non-adaptive
versions

720dpi microweave:

Only tested adaptive random, same artefacts in dark areas, only
stronger, probably because the image in total is noticeable darker (I
didn't adjust the controls). Light skintones are better, darker ones
look very greyish (I expect some experimentation with the levels will
help here). 

720 softweave:
"broken", the image looks very blurry, bottom edge of the image looks
'broken' (i.e as if you abort a print and it has only printed some of
the paths), noticeable banding, looks like some layer is printed a few
pixels too low.


thorsten

-- 
----------------------------------------------------------------------- 
                                                       Thorsten Schnier
                                    
                                             School of Computer Science
                                               University of Birminghan
                                                                       
                                               
T.S...@cs...   
                                                   tho...@sc...