Digital BW, The Print

Hello All,

It's easy to miss something here. And, I can't seem to wrap my head around this.

My brain has labeled my 1270 as BO using MIS black, and, my 3000 as QTR with Quad Tones.

Using QTR with a single ink for BO?? It does make some sense, but I would like to know if that is a valid approach.

gar



*********** REPLY SEPARATOR  ***********

On 1/6/08 at 11:48 AM Ernst Dinkla wrote:

>Peter De Smidt wrote:
>> I've recently started testing out QTR, and so far, so good.  I haven't 
>> found any explanation of the various dithering options, though.  Anyone 
>> know what these are? (I have searched on the QTR yahoo site, but I 
>> didn't find the info.)
>
>Enough threads on the QTR list on the dithering but I 
>selected one of them here, I guessed Clayton wouldn't mind:
>
>
> >>
>Hello Ernst,
>
> > >What are the best results with QTR and BO for the 
>different  Dither
> > >Algorithms ?  The effect must be more visible in BO 
>printing and may
> > >vary per printer and paper. I also wonder what looks 
>most alike the
> > >Epson driver in BO mode. Just curious.
>
>I've been wondering that myself (haven't used QTR much yet, been
>working only with the "Ordered" setting which is slightly
>tighter/smoother than Epson) so your question made me go 
>find out.  On
>a 2200 w/ Eboni and my current QTR BO curve (still under 
>development)
>I printed a step wedge on EEM for each dither setting and 
>compared
>them.  All were with 2880 and "Faster" speed setting (more 
>about that
>below).  Here are the results:
>
>-----------------------------------------------
>Ordered - smaller patterns of dots than Epson's squigglies, 
>slightly
>tighter pattern, slightly smoother in appearance.
>
>Adaptive Hybrid - tiny difference in pattern if you look 
>hard for it
>with the loupe, but for eyeball appearance is nearly 
>indistinguishable
>from Ordered.
>
>Fast - Pretty much same as Adaptive Hybrid, but under the 
>loupe I see
>a tiny bit of dither banding.
>
>Very Fast - Horrible!  Prints streaks of graphic patterns.
>
>Hybrid Floyd-Steinberg - Surprise!  Very tight and smooth. 
>Noticeably
>smoother to the eye compared to Ordered and Epson.
>
>EvenTone - More surprise.  Ever so slightly smoother than 
>Hybrid FS.
>-----------------------------------------------
>
>For a more practical test to verify the above, I printed a 
>landscape
>with clouds, an image that has always showed up BO weakest area,
>smooth midtones.  It verified all of the above ramp 
>observations.
>There is a place in the clouds with little swirling patterns 
>that are
>barely defined in Epson BO, are a tiny bit better with 
>Ordered, and
>are very crisp and clearly defined with HFS and EvenTone, with
>EvenTone being a tiny bit the better of those.
>
>I am delighted.  This is going to make a huge difference to 
>BO lovers.
>  Just on this one test print I can see it's an enormous 
>improvement,
>with a greatly reduced grainy look and retains the 
>luminance.  Now I
>just need to finish working on the curve.  It's still too 
>blocked up
>at the dark end.  I will post it as soon as it's done, 
>probably over
>the coming weekend.  Wahoo!  Imahappycamper.  Why didn't I 
>try this
>before???!!!!  Still need to test with other papers...
>
>About the "Speed" setting: I printed a TrueTone ramp with 
>Speed set to
>"Better" (still 2880), and it messed up the ramp, 
>introducing some
>bumps and streaks into what had been a smooth ramp using 
>"Faster"
>
>
>Regards,
>Clayton
><<
>
>
>-- 
>Met vriendelijke groeten,Ernst
>
>
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