Re: sRGB, sCMYK, and RGM PCS
Re: sRGB, sCMYK, and RGM PCS
- Subject: Re: sRGB, sCMYK, and RGM PCS
- From: neil_snape <email@hidden>
- Date: Wed, 05 Jan 2005 08:00:37 +0100
on 05/01/2005 2:05, Roger Breton wrote :
>
> This is an idea that makes sense, if you ask me, in a way. On the one hand,
> it will make the whole ICC framework less 'observer-oriented' and more
> 'device-oriented'. Instead of relying on an abstract model of color
> representation it will rely on a limited gamut physical model. But since it
> holds the potential of minimizing quantization issues associated with color
> conversions, in that it proposes to encode transforms on a much smaller (and
> realistic?) scale, then, in my view, this alternative 'reference' medium
> should be welcome.
Actually it's rather to make or maximise use of say srgb spaces (for now),
and or less optimal spaces to map the colors intelligently to the maximum
ability of the output device with a large amount of transparency on the
users side. It is not intended to have the amount of putzing about in user
interface that we all do now. You did interpret the mapping inside the grid
correctly.
>> This, if adopted by the ICC for ICC4,xx would first use an perceptual RI,
>> and be called sCMYK.
>
> Well, see, that is a dangerous sideproduct. I would hate people in prepress
> or photography to start to refer to it as "sCMYK" because it's very easy to
> be lured by a name. In my view and not to confuse it with the idea of a
> "real" standard CMYK (we all know this is an oxymoron), HP should take a
> humble stance on it and dub it "hp_inkjet sCMYK". Because then everyone will
> clealy get the intention.
Again it's not necessarily for inkjets, but rather nice color separations
going out to devices optimising output (pleasing color) without much ado
inside the GUI. Think inkjet, high speed printing, Indigo, HDM Quickmaster
etc etc up until offset presses.
>
>> This transform is considered by HP to be less harsh, a milder transform,
>> when going from sRGB to CMYK, then using CIELab and the PCS ICC route.
>
> That makes sense.
Exactly what it does.
>
>> This sCMYK can then, via a minor conversion, be changed for each inkjet
>> printer.
>
> Oh? We'll see some simplified tweaking editor based on that sCMYK? Why not.
> I will only heighten people's awareness to digital color. Maybe HP will tie
> this with Microsoft upcoming Longhorn new color paradigm?
The ICC V4.1 spec allows intelligent mapping or so I assume with my
ignorance on the works by the ICC on the new powers. I still haven't clearly
decided if this is smart CMM or smart profile or both.
>
>> The concept seems to be aimed at the prosumer inkjet printing market?
>
> It has potential. It could even become the next 'PhotoCD' for printers.
See above. Hp have some great color scientists. What trickles over from
their global vision into our daily use as graphic artists all the better.
--
Neil Snape photographer Paris France email@hidden
http://www.neilsnape.com
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