Talk:2537: Painbow Award

2021-11-04T15:32:39Z

R0uge: /* Color blind representations */ new section

LOL [[Special:Contributions/127.0.0.1|127.0.0.1]] 19:49, 3 November 2021 (UTC)
:f!rst p0st [[Special:Contributions/172.69.170.53|172.69.170.53]] 19:50, 3 November 2021 (UTC)

Mein gott, this color palette IS actually painful to look at. [[Special:Contributions/172.70.178.161|172.70.178.161]] 20:02, 3 November 2021 (UTC)

The caption has changed since the image was captured ("color gradient" changed to "color scale"), we need to pull the new comic. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 20:08, 3 November 2021 (UTC)
:I updated the file, although the changes haven't taken effect yet. [[User:Theusaf|theusaf]] ([[User talk:Theusaf|talk]]) 20:37, 3 November 2021 (UTC)

Does anyone know what Lambda is often used for in physics (or other sciences) as it relates to Theta, where Theta is phase? [[Special:Contributions/127.0.0.1|127.0.0.1]] 20:48, 3 November 2021 (UTC).
:I'm surprised YOU don't know. {{w|Wavelength}}. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 22:38, 3 November 2021 (UTC)
::Why are you talking to yourself? [[Special:Contributions/127.0.0.1|127.0.0.1]] 21:07, 3 November 2021 (UTC).
::Wouldn't that make this chart self-referential, in that each color output at any particular x,y coordinate can somehow be measured in terms of wavelength and phasing (red shift)? [[Special:Contributions/127.0.0.1|127.0.0.1]] 21:17, 3 November 2021 (UTC).
:::I think you're responding to my comment (it seems to be above it, though?). Not sure exactly what you mean by self-referential either, but I suppose somewhat. Assuming this is a black body curve, the emission spectra has a peak at the point where the graph shows "peak" intensity; this wavelength is based off the temperature of the black body itself (see Wien's displacement law), whilst the redshift is based on the relative velocity of an observer & the black body (i.e. a star, usually).--[[User:Sapphirejulia|Sapphirejulia]] ([[User talk:Sapphirejulia|talk]]) 23:28, 3 November 2021 (UTC)
:If I had to guess (as an "armchair" astronomer), it seems to be similar to that of a black body (Planck curve) but also showing the phase. A phase shift to me means change in wavelength, i.e. Delta lambda / lambda, but that's normally denoted by the z-parameter (see Wikipedia's redshift article). There's also a phase angle listed under astronomy on Wikipedia, which could relate but never heard of it before. --[[User:Sapphirejulia|Sapphirejulia]] ([[User talk:Sapphirejulia|talk]]) 23:28, 3 November 2021 (UTC)

Scientific publications aren't the only contenders for the award. I see a Painbow during almost every TV weather report. Captured an image of one of them, hope it displays correctly.
[[file:WeatherBow.png|thumb|center|550px|alt=Painbow used by a TV weather forecast]]

[[User:JohnB|JohnB]] ([[User talk:JohnB|talk]]) 22:20, 3 November 2021 (UTC)

This subreddit has a lot of these scales: https://www.reddit.com/r/dataisugly [[User:Fabian42|Fabian42]] ([[User talk:Fabian42|talk]]) 00:03, 4 November 2021 (UTC)

When I'm developing a continuum of colours on a scale (or scale-like) system I tend to try one of two things:
* Hue-based angle, going from one hue-angle to another hue-angle (usually normalised for fullest saturation) at no more than ⅚ths of a rotation between, to keep maximum looking too like minimum, and choosing the endpoints and via-point to be meaningful (e.g. red to green via blue, or magenta to yellow via cyan - whatever best works).
* A series of connected straight-lines through the RGB colour-cube, without too much criss-crossings, again with meaning. I'll make that more complex if necessary, e.g. for eightmap of the Earth, deepest depth #000 (or #002ish, maybe) to #0FF at the minimum depth, linearly #0(n)(n) for n inversely normalised to depth; quickly use #0FF->#FF8->#0F0 across the intertidal range; then from lowest elevations to highest #0F0 shades to something like #A50 (or maybe a grey) then onward to #FFF for the top. All done with simple gradient-based formulae linking height(/depth) directly to whatever changing component there is.
...though I don't usually thing about dichromatic vision (let alone monochromatic), in either case, so I may indeed make things difficult for some people. [[Special:Contributions/172.70.85.249|172.70.85.249]] 01:19, 4 November 2021 (UTC)

At the moment it states: "The red then turns back into green as the intensity increases further." Is there something I misunderstands or is the intensity not decreasing when going from top to bottom? I would have said "when the intensity decreases further" --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 08:18, 4 November 2021 (UTC)

I just like to share some great 'further reads' on scientific colormaps for the ones interested. A must watch on this topic is the talk by [https://www.youtube.com/watch?v=xAoljeRJ3lU Nathaniel Smith and Stéfan van der Walt on the development of matplotlibs colormap]. Apart from very entertaining, it has been the best introduction to color theory I've ever seen.
If you're more into scientific literature, just get directly to the [https://www.nature.com/articles/s41467-020-19160-7?s=09 Nature article explaining proper color maps]. Fabio Crameri, the author of this article is advocating good colormap practice and also has a [https://www.fabiocrameri.ch/colourmaps/ website providing scientific colormaps] that I found very beneficial. [[User:Lvdgraaff|Lvdgraaff]] ([[User talk:Lvdgraaff|talk]]) 13:34, 4 November 2021 (UTC)

Ribbon colors appear to only be consistent about first and second place - after that, they're all over. See https://www.mclaughlinribbonawards.com/award-ribbon-place-color-guide/ and https://www.classicdesignawards.com/ribbonstock.shtml#horsecolors for examples. I've tweaked the third place note - leaving these links for anyone curious. --[[User:Bobson|Bobson]] ([[User talk:Bobson|talk]]) 14:15, 4 November 2021 (UTC)

== Color blind representations ==

I made color blind representations of this comic to show how bad the color scale is then: original, grayscale, protanopia, deuteranopia, tritanopia. But I can't upload them here as a new account. Could someone grab them and add them to the page? https://imgur.com/a/tyS28Hd [[User:R0uge|R0uge]] ([[User talk:R0uge|talk]]) 15:32, 4 November 2021 (UTC)

explain xkcd - User contributions [en]

Talk:2537: Painbow Award