Re: Fogra 51 and 52
Re: Fogra 51 and 52
- Subject: Re: Fogra 51 and 52
- From: Graeme Gill via colorsync-users <email@hidden>
- Date: Thu, 13 Jun 2019 14:22:26 +1000
Refik Telhan via colorsync-users wrote:
Hi,
> The problem actually appears in the color conversion phase. Given that you
> use a
proofing substrate that matches the print substrate in terms of color and OBA
class, the
proof and the print matches. But rich blacks are coldish/bluish/purplish by
seperation.
And the loss of yellow is not limited to the gray axis, all colors that should
contain
high amounts of yellow lose some of it.
All this is correct as far as the measurements are concerned. The paper has
FWA/OBE,
so has a blue leaning white point under M1. Neutrals composed of CMY tend to
have a similar white. Neutrals composed of K tend to be warmer (perhaps because
the K blocks the UV more effectively). So neutrals composed of CMYK tend
to have little or no Y because the K is making them warm enough.
> In short, the separation itself is now colder than
what it used to be under FOGRA39/47.
The neutrals are neutral in relation to the white of the paper under M1.
Whether they appear neutral depends on how well your viewing environment
matches the measurement conditions assumptions. A standard viewing booth with M1
illumination does not match the measurement assumptions, because the
neutral paint it uses does not have FWA/OBE to match the paper, and
so appears warm by comparison, throwing off the observers white point
adaptation state, making the print appear cool.
Cheers,
Graeme Gill.
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