This is an interesting discussion and project!
I have started printing sheets and to add even more complexity - we are
trying to make a video of these neon printed pieces. This is a
Halloween video project so we are also under a time constraint!
I'd be glad to post some pictures and such here if it is allowed - and
interesting for anyone?
But one bit of news - I made up a color chart of sorts with mixtures of
CMYW and sure enough "Black" which is 100 CMYW does fluoresce as the best
WHITE I have seen. White toner alone glows Blue as I've said - but when
fully mixed with the other colors then I do see a not so bad white.
As you might also imagine the camera sees yet another set of colors. I've
been thinking about this project for quite some time and now that Halloween
makes this a 'thing' - I was hoping to carry forward with it.
We are currently editing our original artwork to make White - Black in the
design and thinking of other color changes we can make based on our initial
testing, but really I see potential in doing this with profiles!
David Lewis
On Fri, Oct 4, 2019 at 1:19 PM Tucker Downs <tucker@xxxxxxxxxxxx> wrote:
Even in the case that you profile them as additive, do the colorants
exhibit independence? I would be shocked. It doesn't seem as simple as
making an additive profile like a display device.
It seems possible to develop a model for these colorants using variable
neutral background and spectral illuminant data. Can the new ICC max
support anything like this without using a large multidimensional look up
table?
- Tucker Downs ( shameless plug -> RIT 1st year PhD)
On Fri, Oct 4, 2019 at 8:55 AM David Lewis <david@xxxxxxxxxxxxxx> wrote:
Graeme,
This is my thought exactly!
This is additive color that starts from Black and illuminates additively.
However this is only the part my mind is wrapped around, the previous
note about the graduate project is still the case.
The complete project is an overlapping or maybe even some other term!
There is both a subtractive color profile for the standard light color
space and the additive profile for the blacklight color space.
But that is so far over my head that it hurts.
David
On Tue, Oct 1, 2019, 7:17 PM Graeme Gill <graeme@xxxxxxxxxxxxx> wrote:
Ben Goren wrote:
You are...very, very, very far off the beaten path. I’m all butcertain that there
aren’t any publicly available tools to do what you’re trying to do. Ifany such tools
exist, they’re research projects by, for example, students at theRochester Institute
of Technology.
Maybe. It depends if there's a useful printing process there or not.
It doesn't actually matter what the physics of the process is, there
just needs to be one where (for a notionally CMY or CMYK process),
zero toner = a light/whiteish color, and maximum toner = a dark/blackish
color,
and there is some logical control over the hue of the color being
reproduced.
People have used print profiling on fired ceramic glazes with modest
success,
and they often have fairly bizarre responses compared to a press.
But it's unclear what sort of printing process David Lewis has.
Conceptually it could be more like an RGB additive process, if
(say) the illuminant is actually UV and if three colorants emit Redish,
Greenish and Bluish light under UV, and the substrate is black. But if
that is the case, then it would need to be profiled as an RGB device.
Cheers,
Graeme.
