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IDProjectCategoryView StatusLast Update
0001757OpenClonkObjectspublic2016-07-25 16:05
Assigned ToClonkonaut 
Product Version 
Target VersionFixed in Version 
Summary0001757: Drain and Source pipe not distinguishable with dyschromatopsia
DescriptionK-Pone who has dyschromatopsia (Rot-Grün Schwäche) said it was nearly impossible to distinguishing the source and drain pipes from the pump.
TagsNo tags attached.
Attached Files




Clonkonaut (developer)

Last edited: 2016-06-27 09:22

View 2 revisions

Any suggestions on how to solve this? Since there are other forms of color blindness than red-green, I doubt we can find any two nice colours that everyone in the world can distinguish ;)
On top of that, we'd need to adhere to some universal colour code for in/out. It's no use if one line is blazing orange and the other deep purple if no one knows which line is which.

It's possible to show a little icon on the picture. You won't be able to see the line's state without picking up the line kit though. Also, these icons are error-prone, too. My first idea would be "upwards arrow" for "input" and "downwards arrow" for "output". But is that universally understandable (the answer is often 'no')?


ala (developer)

I did not propose to cover 'all' forms of color blindness. Just red and green, it is by far the most common. A quick look up revealed that Wikipedia lists it with 9% of the male population (it drops to 5% with females included, but lets face it - our player base is male).

I agree with the universal color code proposal, we probably don't need any fancy items. Just picking one of the two colors differently will solve this.

I don't know what would be best, maybe yellow and green or blue and green. I'll ask K-Pone for an opinion.


K-Pone (developer)

Fuuuuuuuu, I hate those "Your session has expired and I won't recover what you've written" types of software...

Anyway, best is if you choose colors with a high contrast that can be easily distinguished by colorblind people. I'll attach an image showing colors I can easily distinguish and which I cannot.


Clonkonaut (developer)

Uhm. I don't really understand that image. :D

Can't you just give two colours that are ok and aren't horrible for in/out colours!


K-Pone (developer)

#EE6600 and #668822 should work. The green color is very light and the red color is rather dark. That can be distinguished by colorblind people as well.


occ (reporter)

Hi! There's been a check-in that references this bug. For more information you can visit the repository browser at this address:

Changeset 042ee8b by Clonkonaut <>
Changed the colours of the drain and source pipes to accommodate for people with red-green color blindness (0001757).

The colours have been suggested by K-Pone.


-Issue History
Date Modified Username Field Change
2016-06-22 23:40 ala New Issue
2016-06-27 09:15 Clonkonaut Note Added: 0005160
2016-06-27 09:15 Clonkonaut Assigned To => Clonkonaut
2016-06-27 09:15 Clonkonaut Status new => feedback
2016-06-27 09:22 Clonkonaut Note Edited: 0005160 View Revisions
2016-06-28 08:59 ala Note Added: 0005171
2016-06-28 08:59 ala Status feedback => assigned
2016-06-28 13:58 K-Pone Note Added: 0005176
2016-06-28 13:58 K-Pone File Added: goodbadcolors.png
2016-06-28 20:25 Clonkonaut Note Added: 0005177
2016-06-28 20:42 K-Pone Note Added: 0005178
2016-07-25 16:04 occ Note Added: 0005215
2016-07-25 16:05 Clonkonaut Status assigned => resolved
2016-07-25 16:05 Clonkonaut Resolution open => fixed
+Issue History