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60 votes

Is colour alone enough to convey warning?

No, it is not enough. This is how your image looks for people with achromatopsia (grayscale vision) This with Blue-Weak Tritanomaly This with Blue-Blind Tritanopia As you can see, there are evident ...
Devin's user avatar
  • 38.1k
28 votes
Accepted

Colorblindness-friendly colors called "green", "blue", "yellow", and "red"

Would patterns work for your use case? You could keep the shape, size, position and orientation the same for each one and have a 'colour blindness mode' where instead of colours to distinguish the ...
GrahamTheDev's user avatar
  • 2,598
23 votes

Is colour alone enough to convey warning?

Color alone is never sufficient to convey information because: Roughly 5% of the world population has some form of color vision deficiency, either dichromacy (only two types of working cone cells), ...
Austin Hemmelgarn's user avatar
19 votes

Is colour alone enough to convey warning?

The color alone is not sufficient as a distinguishing feature. The comparison to a traffic light is also not entirely correct. A traffic light has not only the three colors but also a very specific ...
BrunoH's user avatar
  • 3,435
17 votes

Alert colors are really user-friendly to color-blind users?

Quick Answer In your case that color scheme is NOT safe for colorblind people. First of all don't forget that there are different types of color vision deficiency. Let's summarize why your image is ...
Adriano Repetti's user avatar
14 votes

Color Palette for All types of Color Blindness

The problem with your question is that there are a few different types of colour blindness and each of them perceive colours in different ways to the point that there are no 'colour' pallets that will ...
Roux Martin's user avatar
  • 14.2k
13 votes
Accepted

Color Palette for All types of Color Blindness

The key thing while designing for color blindness is that your colors should provide enough contrast to allow people with monochromatic vision to distinguish between shades since they cant see colors. ...
Mervin's user avatar
  • 44k
11 votes

Colorblindness-friendly colors called "green", "blue", "yellow", and "red"

Consider the following "color-blind friendly palette" I think this palette has colors that can be easily interpreted to be green (4th), yellow (5th), blue(3rd or 6th) and red (7th).
knrumsey's user avatar
  • 211
11 votes

Colorblindness-friendly colors called "green", "blue", "yellow", and "red"

As a colourblind person - thank you. And may the inventors of the colors of LEDs(*) burn in hell for eternity. (since everyone is taking this comment too seriously, I am removing it and let everyone ...
WoJ's user avatar
  • 359
10 votes
Accepted

Do red "destructive" buttons hurt accessibility?

Disclaimer: The software I produce is not required to be WCAG compliant, so I cannot speak to any official requirements. However, my dad is colorblind, so there's that... One of the most important ...
maxathousand's user avatar
  • 19.5k
9 votes

Is it okay to use orange color for buttons and red for warning messages/buttons?

I'd keep your primary action as is, but make your secondary action a link using the same colour as the primary button. This way your secondary action... is less prominant and not so 'in your face', ...
Roger Attrill's user avatar
8 votes

Alert colors are really user-friendly to color-blind users?

You should consider checking any color palette options using an on-line simulator such as Coblis (http://www.color-blindness.com/coblis-color-blindness-simulator/), which shows you how images look ...
Mattynabib's user avatar
  • 3,501
6 votes

Is it a good idea to use red color in User Interfaces?

You seem to be under the impression that color blind people cannot see certain colors at all. This is not the case. Most color blind people are able to see things just as clearly as the rest of the ...
Wendy Wojenka's user avatar
6 votes
Accepted

Alternatives for red/green in diff output

Red and green has a certain logic to it, in the sense that Western culture does associate green with “positive” states and red with “negative” states. In this sense, red is appropriate for deleted ...
Michael Zuschlag's user avatar
6 votes

Alternatives for red/green in diff output

The direct answer to your question is completely opinion based, so I'll ignore it. Instead... To arbitrarily pick two different colors would go against a well established standard. By not maintaining ...
Nicholas Pappas's user avatar
6 votes

Colorblindness-friendly colors called "green", "blue", "yellow", and "red"

While it is commendable to be considering this factor, you also have to think about the bigger picture here. That is, you are trying to make a game that you want as many people as possible to be ...
musefan's user avatar
  • 7,111
5 votes
Accepted

Accessibility color difference best practices

The W3C Techniques For Accessibility Evaluation And Repair Tools says: Two colors provide good color visibility if the brightness difference and the color difference between the two colors are ...
Roger Attrill's user avatar
5 votes

Colorblindness-friendly colors called "green", "blue", "yellow", and "red"

In science/data science, the viridis color palattes have become pretty popular over the last few years for creating colorblind friendly figures. It's targeted for R programmers, but here's a link to a ...
anjama's user avatar
  • 151
5 votes
Accepted

How do I subtly show that an element in large collection of elements was recently changed?

Interesting question. I believe that you're almost on track, some slight re-adjustments are needed. I want to be able to highlight those elements that have changed in the last 24 hours I'd like it to ...
hoodybites's user avatar
5 votes

Does Wordle's high contrast mode confuse the meanings of the colors for colorblind users?

I'm not sure I understand your question correctly, but I've the impression that you assume that people with color blindness see the same as people with "normal" vision. If this is the case, ...
Devin's user avatar
  • 38.1k
4 votes
Accepted

What is the thought behind veg and non veg icons?

It's not a universal standard but a system imposed specifically in India by the Food Safety and Standards Act (2006). ...A declaration to this effect shall be made by a symbol and colour code so ...
Matt Obee's user avatar
  • 14.5k
4 votes

Alert colors are really user-friendly to color-blind users?

While important, colour-blindness is not necessarily relevant to this case. If the alerts are positioned in such a way that they cannot be confused with anything else and different kinds of alerts ...
Roux Martin's user avatar
  • 14.2k
4 votes
Accepted

What is the number 0.05 in the calculation of contrast ratio between colors?

The Gamma correction and RGB constants are derived from the Standard Default Color Space for the Internet (sRGB), and the 0.05 offset is included to compensate for contrast ratios that occur when a ...
Lokesh Dhakar's user avatar
4 votes

Color blindness test for a chart color palette

You can use this tool to preview your image for different types of colourblindness: Coblis — Color Blindness Simulator
Hasan Hemmati's user avatar
4 votes

What is the UX guideline or ruleset for making accessible while we have conditional formatting colors applied to each rows?

From an accessibility conformance perspective with respect to WCAG 2.1, the main guideline that comes into play here is WCAG 1.4.1 Use of Color (emphasis mine): Color is not used as the only visual ...
slugolicious's user avatar
  • 3,305
3 votes
Accepted

Can palettes be unambiguous for colour blind users?

Since Your users are entirely illiterate Your users are potentially colour blind You only have to display four distinct options You are able to issue verbal instructions to your users about how ...
Michael Heraghty's user avatar
3 votes

Color blindness test for a chart color palette

Color Oracle is my preferred tool. It is great. You change the settings on the app and it changes everything in your screen.
Mike Mark's user avatar
  • 883
3 votes

How can I find a color scheme that is appropriate for color blind persons?

There are different types and degrees of color blindness. So, what one color blind person can't see, another may be able to see perfectly fine. The absolute safest bet is black and white. But, ...
Christine's user avatar
  • 394
3 votes

How do I subtly show that an element in large collection of elements was recently changed?

Could you add a button/option that specifically highlights what has actually changed? Then, if someone is looking for those events that would help them and not distract those who aren't. It's a ...
mgraham's user avatar
  • 1,803
3 votes

LED indicator considerations for colorblind users?

There are some good articles written about the accessibility of traffic lights written, which I think applies equally well to LED indicators. However, the size of LED indicators and the distance that ...
Michael Lai's user avatar
  • 27.3k

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