New subject: Isocoated vs EuroscaleCoated vs. EuropeIsocoatedFogr a27

11 Nov 2005

      Hello 

Interesting colour at the tip of the AdobeRGB gamut. I checked the Delta L*,
Delta C* and Delta h* from original Adobe RGB Lab-values to ISOcoated
Lab-values
- with perceptual:	DL* 0.1, DC* 84.1, Dh* 24.3
- with relative:		DL* 2.8, DC* 82.0, Dh* 1.3

So actually from colour numbers relative is reproducing the hue much better
than perceptual. Same thing can be seen if you draw ab-space at L-level of
30 and put those Lab-values there and draw a line from 0,0 to 68, -112.
ISOcoated's relative colour is almost on the line. 

However how we experience the colours is another story...

BR Jouni Marttila

...
 -----Original Message-----
From: eci-en-admin(a)lists.transmedia.de 
[mailto:eci-en-admin@lists.transmedia.de] On Behalf Of Bob Marchant
Sent: 10. marraskuuta 2005 18:26
To: eci-en(a)lists.transmedia.de
Subject: Re: [ECI-EN] Isocoated vs EuroscaleCoated vs. 
EuropeIsocoatedFogra27

On 10 Nov 2005, at 11:15, Andy Psarianos wrote:

  I have tried to reproduce this blue/purple
problem a few  times now and
  have been unable to reproduce 
Hi Andy.

Make Adobe RGB file (or sRGB if you prefer) .Fill with LAB reference 
30,68,-112.

Preview with ISO coated in relative and perceptual modes. See the 
difference in hue (hopefully!)

Prior mails may have mentioned  colours that are not real. We shoot 
flowers that fluoresce into ultra violet and infra red, products with 
spot colour , fluorescent backgrounds etc etc. We know that we don't 
stand a chance of matching these colours in CMYK , but a good profie 
will give   a good first stab at it without shjfting the hue too much 
.Ir's mostlly at the cost of saturation.

The ECI profiles seem to lose saturation with perceptual colorimetric 
rendering intent , and shift hue in saturated blues with relative 
colorimetric intent. Building profiles with the FOGRA data using 
Profiemaker 5 is giving us better results, and building profiles with 
the same software using our own data does likewise.

BTW we proof to ISO standards and get the same results , so it's 
apparently not a screen thing.

Hope this helps.

Regards,

Bob Marchant.

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RE: [ECI-EN] Isocoated vs EuroscaleCoated vs. EuropeIsocoatedFogr a27