Questions tagged [contrast]
is the difference in luminance and/or color that makes an object (or its representation in an image or display) distinguishable.
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How do you create both sufficient contrast and a harmonious outcome for text on different tints of the same color?
Here are two examples. One is a table, the other an illustration. Both use different tints of the same color with text on top. How do you change the color of the text across these tints to be both ...
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Yellow in high contrast modes
We're implementing different color themes across our apps.
All our basic themes are WCAG level AA compliant, but now it's high contrast theme's turn. It's going to be a theme that features maximum ...
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Do disabled buttons still need to be contrast compliant for accessibility?
Very related to this question: Accessible Disabled State but that is about how to style disabled buttons to make them accessibility compliant, but my question is slightly different.
Is it actually an ...
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WCAG' Non-text contrast requirements, what exactly are the guidelines with hover?
WCAG does a weird job of explaining their non-text contrast requirements with hover states.
Within their "Understanding non-text contrast" documentation, they have this bizarre example:
As ...
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Statistics (or tools) on screen calibration & readability
Fairly straight forward question, but I could not find any answers to it. Are there any known statistics regarding screen calibration & readability?
Are there any colors to avoid where screen ...
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Practical 'lightest' shade of grey for contrast with white
I often use a light shade of grey such as rgb(242,242,242) in my designs to provide a subtle contrast to white, e.g. for the background of alternating rows in a table.
I can easily distinguish ...
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Legibility and contrast for light weight sources. Regarding accessibility
I am developing a web application, starting from an approved design, I have the task of evaluating if it is readable.
The question is: the light body, modifies the consideration over the contrast? ...
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Color contrast too low, but element good visible
I am checking a software against the software ergonomic requirements of WCAG 2.1 Level AA. On part is the colour contrast, which must be for graphics 3.0:1. In the following graphic the orange part is ...
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Text Contrast Issue: How to enhance a hero image section?
I'm using a hero image as a landing page for a ecommerce site. Here's what it looks like so far:
I'm having issues with the text's contrast over the background image. Any ideas on how I can make the ...
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Maximum contrast ratio for good accessibility
So we are remaking an enterprise app from scratch. This time we want to base our design decisions on proper research.
Our users use the app 24/7 with high requirements for UX. So our main goal is to ...
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What is the number 0.05 in the calculation of contrast ratio between colors?
To calculate contrast ratio the following formula is used (source):
(L1 + 0.05) / (L2 + 0.05)
where:
L1 is the relative luminance of the lighter of the colors, and
L2 is the relative luminance of ...
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WCAG 2.0 color contrast - How strict do you need to follow?
I have some buttons with a purple background and I am trying to set the text color so it is in compliance of the WCAG 2.0 color contrast rules.
My issue is that I just don't understand how based on ...
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(WCAG 1.4.11) Understanding 'subsuming' in Non-text Contrast AA Level
In a vaccuuum I understand how to interpret the criterion.
If a border is the only way to identify a control then Border vs container must have >3 contrast.
If a background is the only way to ...
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How to check contrast of a transparent button with a border?
Simple question but I can't find the correct way to test.
I have a normal button, that is transparent but has a border colour with some opacity. I'm not convinced that the contrast ration is high ...
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Are contrast checkers really accurate?
Is WCAG AA level truly necessary? I'm having difficulty making optimal contrast choices, and honestly, bold text, even at 16px, appears much more readable than regular text. Additionally, I often ...
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Do small icons have to pass at least 3:1 for contrast accessibility?
Can anyone clarify if icons (UI elements) 20x20 etc have to be 3:1 and is that a recommendation?
Thanks
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APCA (WCAG 3.0) does not allow for 14px font to be used as a regular base
According to APCA (WCAG 3.0), we are not able to use 14px font as a regular base, but when it comes to SaaS application design, 14px is commonly used as the base font size. Despite my attempt to use ...
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Change link color based in background color?
Our white-background webpages use the blue hyperlinks as shown in the image below.
Occasionally we have dash-bordered yellow information sections on a white webpage as shown. In that case someone said ...
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Contrast ratio for button background color?
I am working with making a website WCAG II compliant. The designers are asking to use yellow buttons (specifically, #fcdb31) with blue text on top of them on white backgrounds.
While the blue type on ...
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Background video & accessibility of text overlays
I have a situation with an autoplaying video banner (you know the type, full screen html background element) where there is text overlayed on top of it -- common in marketing landing pages and their ...
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Do line numbers in a code theme need to meet WCAG AA contrast?
We're designing a custom code theme which displays line numbers, and we're having some internal debate whether these line numbers need to meet WCAG AA contrast guidelines? They're not the main body ...
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Formula for color contrast between text and background
In my Android app a user can choose the color of an item. This color is then shown in background with a text on it. I want to display the text either in black or white - depending on the background ...
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Why do many prominent web apps use blue primary button with white text, when it fails the WCAG 2.1 contrast threshold
WCAG 2.1 says to have a minimum contrast ratio of 4.5:1, but blue primary buttons of Twitter, Figma and Outlook have white text which fails to cross the threshold ratio. Is there another scientific ...
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Using text-shadow for accessibility
I'm interested in understanding whether there has been any research or confirmed values for using the text-shadow property with the goal of meeting WCAG minimum colour contrast values.
In my ...
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Color picker - what to do if the user selects the same color as the background?
I am working on a app that has an area dedicated to color choosing, like so:
Now, ordinarily, this works fine, but what if the user chooses the same color as the background color? It would look like ...
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How to automatically calculate contrast
Scenario: a user can change the default design of a site by selecting a color. This color is applied to the menu background color. The problem is that I have to change the menu text color depending on ...
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Image comparison sliders and visual accessibility
I am creating an image slider for a site, and I am confused on how to successfully meet wcag requirements. Below is an example that conveys the idea of what I am creating.
I have read a couple ...
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Is 200% browser enlarge an alternative for colors with contrast less than 4,51:1?
I have a website that has font size for body 14px. All the colors have contrast ratio of 3:1.
wgac 2.1 states that normal fonts should have a ratio of 4,51. But if the user zooms in the site, normal ...
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Is high contrast mode really useful?
In most operating systems and on some websites there is a high contrast mode, intended for use by visually impaired people. I have doubts, however, whether using such mode makes any sense - from what ...
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Contrast of a message box
I'm in the middle of updating the colours of our app and making them as consistent as possible, but also trying to bring them in line with the WCAG AA rating for contrast.
One area I'm unsure if I ...
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Looking for research regarding pure black vs dark gray for readability
I've heard people say that websites with pure black text on a white background can cause exhaustion when reading, and that it's better to use a very dark gray text or a light gray background color to ...
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Button passes contrast test however button's background and div's background are low contrast
I have been going back and forth with design about this. I think there should be a contrast with the button and the div that holds the button, however, design says there is no rule about that. I try ...
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WCAG 2.1 contrast issue for Google/Angular Material Design
I'm relatively new to accessibility compliance, but my research has found a confusing anomaly: The Angular Material buttons, links, etc are apparently WCAG compliant, yet do not seem to have the ...
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What are the negative and positive aspects of dark color scheme?
I am using Light-on-dark color scheme (dark background with light text) in my application.
My question is, what are the negative and positive aspects of this color scheme and why this color scheme ...
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Is there a standard for indicating a high contrast style? [closed]
I am working on a web app and have developed both a normal stylesheet and a secondary high contrast stylesheet. I am coming unstuck when it comes to allowing a user to switch between styles.
Is ...
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What is the procedure for measuring color contrast around anti-aliasing?
What is the proper method for measuring the color contrast of on-screen elements that are anti-aliased (particularly, but not limited to, text)? Does a standard method even exist?
Here's my specific ...
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How to force the user to draw on certain elements if there are images in the layout
Well, I ran into the problem of distinguishability of content in a mobile application. In fact, there are a huge number of pictures on the page (movie poster, preview of the film as a picture). A lot ...
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Colors VS Screens - Colors to avoid
I'm working on my personal webpage, my primary background color (apart from white) is straight-forward turquoise (#40e0d0) from the styles selection in my navigator.
On my laptop, the color is more ...
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Text contrast for highly saturated call to action buttons
It's become a part of my way of working that I check areas of my design are adhering to accessibility guidelines, WCAG2.0 colour contrast in particular.
At the moment I'm working on creating a new ...
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Color contrast for graphics
I'm trying to find information about minimum contrast ratio between graphic elements (e.g. a bar-graph and its background) but I can't seem to find any. Are there any good practices?
WCAG 2.0 ...
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How to interpret wcag2.0 guidelines on contrast for buttons and icons
The accessibility guidelines from the W3C offer neat and usable guidelines for creating text that is readable for everyone. There are a number of very useful tools for checking contrast levels, so it'...
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Mostly white screen (8 hours per day)
I am using an application which has a white background color.
I am using this application 8 hours per day.
I think a GUI with less contrast would be better for my eyes. I guess this would save some ...
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What is the difference between WCAG 2 AAA Compliant and WCAG 2 AA Compliant
I use a web app to check my site color contrast. Most of my color (Back/fore ground colors) are OK and I see YES inside textboxes except the one which refers to WCAG 2 AAA. What is it? What is the ...
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How many visually distinct colors can accurately be associated with a separated legend in a figure?
For charts and graphs it's a relatively common question by programmers to want to procedurally generate an arbitrary number of colors that are visually distinct.
Various research (or educated guesses)...
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Play & Stop VS Start & Stop for meditation app
I'm working on a mobile app and deciding about whether to change the name of the button from play to start. This controls the circle as shown below.
At the moment it's play and stop but do you think ...
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Should I switch to a dark theme UI if the app is used at night?
Should I dynamically change the theming of my application based on ambient lighting?
My app will be used in bright daylight, as well as in a dark movie theatre, or may be opened at night. I ...
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High contrast/visible colors for google maps
I am creating some custom markers for an application that uses google maps
They stand for a tow truck and a broken car.
An important constraint is that they must contrast with the map bellow, in ...
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Dynamic mobile styling based on the lighting of the users environment
Would it be useful to come up with a dynamic mobile styling feature based on the lighting of the users environment. Similar to how the imac reduces its brightness if you cover the cam on top of the ...
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What should a well-designed high contrast function do?
I want to make my website accessible for nearly everyone. I already have a function to increase font-size. Now I am doing the high contrast function.
However, how should such an interface for ...
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Material Design - text colors don't maximize contrast
Description
The color palette for Material Design specifies hues as well as suitable colored (white/black) text to be used for each backing-hue. So for example in the Red palette there are 10 '...
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