[argyllcms] Re: Direct control of data in a profile?
- From: Ben Goren <ben@xxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 17 Nov 2017 08:36:40 -0700
On Nov 17, 2017, at 8:18 AM, Yves Gauvreau <gauvreau-yves@xxxxxxxxxxx> wrote:
I would like to create a somekind
of profile that convert a monochrome image, say only L* is useful to another
set of LAB values where now these are colors. The purpose of such a
conversion is to produce a "colored" negative to be used in a photographic
If the goal is to re-create the original color of the scene -- skin tones,
green leaves, blue sky, that sort of thing -- then no such thing is even
remotely possible based solely on the L* value of the pixels.
Indeed, you'd need some form of intelligence -- artificial or otherwise -- to
even begin to make a stab at it. You'd have to be able to recognize the shapes
in the image, and to know what colors those objects typically have. Even then,
it'd only be an approximation. Is that shirt light blue or light green? Is the
hair red or light brown? Are the leaves blue-green or brownish-green? Even when
Hollywood does this with old black-and-white movies, they grab artists from
their animation departments to do the coloring, and team them up with
archivists and historians to find out what they can about the film set, props,
If, instead, you just want an artistic effect that, say, makes shadows bluish
and highlights reddish (to pick an arbitrary example), then you want a tool
like Photoshop. That's a variation on the "sepia" idea, and usually referred to
as "duotone" or "quadtone" or the like, depending on the number of colors.
Printmakers know how to do it on a press using screens and ink; somewhere,
buried in a menu or the like, Photoshop has the ability to do it digitally.
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