[argyllcms] Re: Aw: Re: Profile for calibrated color-prints on dark background?
- From: "Richard Kirk" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "richard" for DMARC)
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sun, 6 Oct 2019 20:24:54 +0100
On 6 Oct 2019, at 11:53, Lars Grobe <grobe@xxxxxxx> wrote:
The scenario is to print not direktly on dark, but on transparent media, that
will - most of the time - have an almost black background (we can assume it
to be perfectly black). This means that the whole printing logic kind of gets
reversed - to achieve white, I need a lot of ink, while for black, I can just
go with zero density. I am not sure if this is actually possible with ICC, or
any other profiling technology out there.
Have you tried this with solid colours?
The reason I ask is that the colours will fluoresce in all directions, so the
light level in a particular direction may be rather weak. Luminous paint has a
similar problem: you can see it in the dark but only if you put it on a very
reflective background. Stick luminous paint on black and you see almost
nothing. It is likely that a fluorescent colour will show up more, but how much
more? You may also get a lot of haloing, as you will get a lot of internal
reflection in the transparent media, and only a small solid angle will escape
to be viewed.
I don’t want to pour cold water on your idea. I tried to do exactly the same
thing about 1990 for Canon. I managed to get good pictures printed on white
paper, but did not manage the transparent media (they had slide printing paper
and fluorescent inks but maybe never used the two together). So I will
acknowledge anyone who tries to do the same thing as my brother/sister in
spirit. But maybe a simple test will save you some time if it isn’t bright
enough.
..or..
You could print a white fluorescent (these can be more efficient) and put CMY
dyes over this. White LEDs have a white phosphor which is smooth-is (a peak in
blue and a very broad peak in yellow).
Cheers
Richard Kirk
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