Re: New Topic
Re: New Topic
- Subject: Re: New Topic
- From: Dan Reid <email@hidden>
- Date: Fri, 08 Feb 2008 09:15:10 -0700
- Thread-topic: New Topic
on 2/8/08 8:41 AM, Mark Rice at email@hidden wrote:
> I think my main point is being missed. I don¹t really care of the
> linearization is neutral (although it is nice for making B&W prints with full
> ink density) but I want REPEATABILITY. Example I once made a beautiful
> print of Halle Berry, with glowing skin tones. Since then, I have recalibrated
> -- and I haven¹t been able to get as good a print since then. A RIP system
> that recalculates some unknown curve value buried in binary data is never
> going to achieve repeatablilty.
>
> What¹s this ³so twentieth century thinking² business. I thought only valley
> girls talked like that. Density is an absolute measurement of light
> reflectivity or transmission. LAB is a relative measure that approximates
> human perception. One cannot be substituted for the other. BTW, Status E,A,M
> and T are not related to America or Europe they are sets of filters with
> specified bandpass capabilities for denistometric measurements.
>
>
Hey Mark,
I see might I have miss understood your question. Thanks for the
clarification. Have you tried ProfileMaker relin in ProfileEditor? Or do you
have MonacoProfiler? That has lin feature too but it¹s not really intended
to do what you want but may help. A lin at the RIP and a lin at the
profiling package could help minimize deviations. Give that a shot. Thanks.
--
Dan B. Reid
RPimaging, INC
Color Management Products and Training for Print, Internet, and Motion
Graphics
http://www.rpimaging.com | Toll Free: (866) RGB-CMYK
>
>
> From: Dan Reid [mailto:email@hidden]
> Sent: Thursday, February 07, 2008 7:42 PM
> To: Mark Rice
> Cc: colorsync
> Subject: Re: New Topic
>
> on 2/7/08 11:27 AM, Mark Rice at email@hidden wrote:
>
>> > To create a neutral gray on an inkjet printer, one would have to choose the
>> > correct UCR or GCR specs before linearization takes place - and that is
>> what
>> > I am advocating. Most RIP manufacturers leave the separation choice to the
>> > last step - creating an ICC profile. If one made the choice early in the
>> > process, it would account for crosstalk between the inks, and be much more
>> > likely to provide a neutral gray scale. In addition, most RIP makers
>> simply
>> > linearize the individual colors up to an arbitrarily determined ink
>> > limitation, thus ensuring that the darker portions of the grayscale will >>
not
>> > be neutral. I believe that linearization should account for the full
>> > grayscale, not just the linearization of each color indepentenly. Inkjets
>> do
>> > not have to have a green cast in the shadows -it simply occurs because of
>> > the hokey method the RIP makers have used for linearization.
>> >
>
> Hi Mark,
> There are many ways to achieve this with current RIP products. I have been
> teaching this type of grayscale (lin) balancing for years. It's possible, I do
> it all the time. Yes some RIP manufacturers are more clueless than others in
> how to do this with their products, but that's why I get paid the big bucks.
> ;-)
>
> I teach graybalance lin using ColorPort and ColorShop X ( or ColorThink ).
> It's really not that difficult once you understand how each RIP product
> behaves with the lin. You shouldn't be too concerned with shadows (darker than
> 3/4 tones) as the eye is not sensitive to this area of the tonal scale. You
> can successful graybalance down to the 3/4 tones without much difficulty, but
> figuring how to do it with your RIP (which RIP are you using?) is key as each
> have a different method of implementation. Obviously some easier/better than
> others.
>
> In terms of relin, yeah most RIPs are not very good at hitting the same
> targets time and time again. Only a few can do it in the proofing world with
> measurable success. BUT, if you have automated spectro it ain't that big of
> deal to make a new profile if you are really SEEING a difference. Remember
> trust your eyes. . . . . . .
>
> BTW, density and D/Max is so 20th century thinking and totally
> inappropriate for inkjets. And if you are going to talk about density at least
> clarify by stating Status A (photo), Status E (Europe), of Status T (US).
> Step into the 21st century of the LAB color model (D50 2degree) ;-)
>
> PS, Onyx has a graybalance feature built into their linearization process. .
> ....
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