My eyes are definitely favoring the L20-80 over the L5-95 colormaps. Does
Luminosity take into account human's non-linearity in perceiving
brightness? I remember a few years ago many of the open-source graphics
tools (such as GIMP) had to be fixed because it assumed a linear brightness
perception. IIRC, humans are better at perceiving brightness gradients on
one end of the range than on the other end.
On Mon, Feb 23, 2015 at 1:30 PM, Eric Firing <efir...@hawaii.edu> wrote:
> On 2015/02/23 8:16 AM, Benjamin Root wrote:
> > Interesting choices, and I think we are on the right paths (no pun
> > intended) through the two possible colors. However, I think the same
> > problem arises that I noted before. Both ends of the colormap are nearly
> > black to nearly white. IIRC, our perception of luminosity has a much
> > greater range than it does for chroma. While it is nice to take
> > advantage of that, I wonder if we are going too far in the luminosity
> > range? Perhaps these colormaps would be better if the luminosity range
> > wasn't as full as it is here?
> >
> > Ben Root
>
> Ben,
>
> I was noticing the same thing, except that at least on my screen, the
> problem is mainly at the dark end, and it varies with the actual set of
> control points. The very last one, for example (Purple Red Yellow
> L5-95) has what looks like a fairly linear ramp from end to end on my
> screen, while "Blue Green Yellow L10-90" lacks contrast on the dark end.
> I suspect all this will be quite dependent on the particular screen
> (or printer--including the whole chain of color conversions ending up in
> ink or toner dots) being used. It doesn't look to me like a problem
> with the luminosity range as such. We have a highly nonlinear problem
> here.
>
> In any case, this looks like a nice tool. Maybe it can be combined with
> Nathaniel's code, which shows other aspects of the colormap?
>
> Eric
>
>
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