Nothing Rhymes with Orange

[Louis King]

All, Nor can I find a good RGB to make orange!

I am using VPython to build the graphics for a puzzle simulation with 8 numbered train cars. Thinking it would be "logical" to use the IEC color codes, I have not been able to find a RGB combination  for orange that doesn't look like a bad brown, or worse!

Any suggestions would be helpful.

Currently I am using:

# IEC color code: 0-Black, 1-Brown, 2-Red, 3-Orange,
# 4-Yellow, 5-Green, 6-Blue, 7-Violet,
# 8-Gray, 9-white
self._color = [vec(0, 0, 0), vec(0.72, 0.42, 0), vec(1, 0, 0), vec(1, 0.572, 0.074),
vec(1, 1, 0), vec(0, 1, 0), vec(0, 0, 1), vec(0.93, 0.51, 0.93),
vec(0.5, 0.5, 0.5), vec(1, 1, 1)]

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             

[Louis King]

All, Just to be sure,  

• color.orange is defined as vec(1,0.6,0) looks like light brown

[Tyson Sommer]

I'm not an expert on IEC colors or vPython, but I know in Photoshop, orange easily becomes brown by dropping the luminance. Turn up the equivalence of that. Brown is essentially dark orange.

[Tyson Sommer]

And if it still looks brown, it needs more yellow and/or red. Saturation is also a factor. 

Not sure if any of this will be immediately helpful, but it might put you in a right direction.

[Tyson Sommer]

I do know vPython also lets you set your own RGB values. If you google "rgb color picker," Google has one built in that you can use to get the RGB values of any color. Use the slider to dial in the hue and the rectangle above it on the right side to dial in the tone, shade, etc. Then use those RGB values in vPython.

[Bruce Sherwood]

Here is a place where it is easy to explore RGB:

   https://www.glowscript.org/#/user/GlowScriptDemos/folder/Examples/program/Color-RGB-HSV-VPython

Bruce

[Kevin Karplus]

Standard orange is (255,165,0)  which is about (1.0, 0.65, 0).  The problem is not with the color code, but with your monitor, which is set too dim.  Dim orange is brown.

Kevin Karplus   kar...@soe.ucsc.edu    https://www.soe.ucsc.edu/~karplus

Professor Emeritus, UC, Santa Cruz

Author of Applied Analog Electronics

Affiliations for identification only.

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[Louis King]

Thanks for all the additional references.  Bruce I had not found  https://www.glowscript.org/#/user/GlowScriptDemos/folder/Examples/program/Color-RGB-HSV-VPython 
 

That demo did help eliminate several sources of the problem. By running the glowscript demo in one copy of my browser, and my script using VPython in a second copy of my browser, the colors rendered can be compared. Using rgb vec(1, 0.6, 0) in both and adjusting the two browsers so that the two "orange" blocks are side-by-side, the VPython color is noticeable "muddier"/browner/dimmer than the glowscript version. Need to play with emissive of orange objects, canvas and lighting variables to see if I can get a better color.

[Mike Reed]

Hi Louis,

If it helps, I can confirm that (1,0.6,0) looks very orange on my monitor.  My monitor has been calibrated, so if you are not seeing orange it is probably an issue with your screen.  If you use color.orange you can be reasonably confident that most other people will see orange, even if you don't. 

Mike.

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