On 2015/04/04 10:10 PM, Nathaniel Smith wrote:
We'd welcome any feedback from readers with non-simulated color deficiency!
I checked with my red-green color-blind colleague, Niklas Schneider, and his evaluation is attached.
Eric
--- Begin Message ---Hi Eric, the color scheme is good. To my eye, there is no bar of uniform color, and, even more general, no duplication of color. The only quibble may be the saturation toward 0 and toward 1. This is a good scheme, actually, I'd be interesting in the algorithm to implement in idl. Niklas On Sun, Apr 5, 2015 at 8:38 AM, Eric Firing <efir...@hawaii.edu> wrote: > Niklas, > > We are working towards a revamped color scheme for matplotlib, and one of > the goals is to have a default colormap that works reasonably well for > those with color vision anomalies. Would you be willing to comment now and > then on colormap candidates? One prototype is shown below. Colormap > criteria include visual linearity and the ability to discriminate as many > steps as possible. The widely-used "jet" scheme, which until recently was > the Matlab default and is still the matplotlib default, scores badly on > linearity, and presumably causes red-green ambiguity problems as well. > > Eric > > > -------- Forwarded Message -------- > Subject: Re: [matplotlib-devel] release strategy and the color revolution > Date: Sun, 5 Apr 2015 00:20:03 -0700 > From: Nathaniel Smith <n...@pobox.com> > To: Eric Firing <efir...@hawaii.edu> > CC: Michael Waskom <mwas...@stanford.edu>, matplotlib-devel@lists. > sourceforge.net <matplotlib-devel@lists.sourceforge.net>, Stéfan van der > Walt <stef...@berkeley.edu> > > On Mon, Feb 23, 2015 at 10:46 AM, Eric Firing <efir...@hawaii.edu> wrote: > >> On 2015/02/18 2:39 PM, Nathaniel Smith wrote: >> >>> >>> On Feb 16, 2015 3:39 PM, "Eric Firing" <efir...@hawaii.edu> wrote: >>> >>>> >>>> >>>> On 2015/02/16 1:29 PM, Michael Waskom wrote: >>>> >>>> Nathaniel's January 9 message in that thread (can't figure out how to >>>>> link to it in the archives) had a suggestion that I thought was very >>>>> promising, to do something similar to Parula but rotate around the hue >>>>> circle the other direction so that the hues would go blue - purple - >>>>> red >>>>> - yellow. I don't think we've seen an example of exactly what it would >>>>> look like, but I reckon it would be similar to the middle colormap here >>>>> >>>>> http://earthobservatory.nasa.gov/blogs/elegantfigures/ >>>>> files/2013/08/three_perceptual_palettes_618.png >>>>> (from the elegant figures block series linked above), which I've always >>>>> found quite attractive. >>>>> >>>> >>>> >>>> Certainly it can be considered--but we have to have a real >>>> implementation. >>>> >>> >>> >>> While I hate to promise vaporware, I actually was planning to have a >>> go at implementing such a colormap in the next few weeks, based on >>> optimizing the same set of parameters that viscm visualizes... FWIW. >>> >> >> >> It might be worth quite a bit--and the sooner, the better. >> > > While it's taking longer than hoped, just to reassure you that this > isn't total vaporware, here's a screenshot from the colormap designer > that Stéfan van der Walt and I have been working on... still needs > fine-tuning (which at this point probably won't happen until after I > get back from PyCon), but we like what we're seeing so far :-) > > The colormap shown has, by construction, perfect lightness linearity > and perfect perceptual uniformity, according to the better-than-CIELAB > model used by the viscm tool I linked upthread. > > -- > Nathaniel J. Smith -- http://vorpus.org > > > >
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