QTR-Quadtone RIP

no-one?

On 15/03/2011 18:22, Mike Finley wrote:
>
> So far, I've not had to create new curves, just tweak existing ones for
> similar papers. Now I've switched to an Epson 3880 and it doesn't have
> many existing papers to start from, so I'm trying to figure out how to
> create my own curves, starting with a glossy paper (innova fibaprint
> white gloss).
> I've printed a 21 greyscale patch and read the Lab values, and am now
> not sure how to interpret them.
>
> L I'm not bothered about ... linearising should clean that up easily
> (its pretty good to start with) but am not sure how to interpret the a
> and b values:
>
> a starts from a low range of 0 to 0.4 (meandering) up to the 50% ink
> point, then rises steadily to 1.6 at 70% ink, and then to 1.8 at 90% ink.
> b varies up and down over a range of 1.5 to 2.4 (the paper white is
> 1.5). As there's not much of general progression, more meandering up and
> down, it seems I'll just have to take this as reasonable.
>
> Being partially colour blind, its not easy for me to judge the impact! -
> are these significant (this is supposed to be the neutral curve) or
> should I try to at least reduce the a ramp, by reducing the magenta
> content a little
>
> Thanks for any insight ...
>
> mike
>
> -- 
> mike finley photography
> http://www.mikefinley.co.uk
>
>


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