Re: Postershop and Ink Limits
Re: Postershop and Ink Limits
- Subject: Re: Postershop and Ink Limits
- From: Roger Breton <email@hidden>
- Date: Mon, 08 Jul 2002 08:24:20 -0400
>
Graeme Gill wrote:
>
It depends on the profiling package. A poor package may not cope
>
with the hue shift. As long as the hue shift is not more
>
abrupt than the resolution of the profile, then a good
>
package should cope with the hue shift without a problem.
Interesting. You mean as long as it is within the # of grid points in the
Lab to CMYK transform?
Would you say the same thing applies for gray balance? Like, I noticed that
the more greenish steps of equal % of CMY appear (10Á0%m10%y,
20Â0%m20%y, ... 100Á00%m100%y) the worst the profile calculated gray
axis will be. So much so that I have the impression, like Thomas Holm said
once in a recent post about the EPSON 2000, that no amount of profiling will
be able to correct this and that, in these conditions, the profile's gray
axis will never be neutral.
To make matters worse, on the EPSON 10000, on many media I have tested, to
get rid of that greenish CMY scale, one has to either restrict the cyan and
yellow together, therefore reducing the total gamut size -- which isn't
good, or increase the magenta ink, which is impossible if one already starts
with the maximum of magenta in the system (100%). It is a catch 22
situation. And I don't think a prelinearisation stage like that used in
ColorBlind can solve the problem either.
And I have found that because the gray axis is wrong, so are many of the
profile's colors. Like the reds or the yellows will often be off by many
degrees. And tht goes for all profiling apps I have used, including
ProfileMaker 4. I wish that profile manufacturers would state in their
documentation what are the boundaries within which their profiling algorithm
will work and we'll adapt instead of promising us the moon and let us waste
paper and ink.
Best regards,
Roger Breton
Laval Qc
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