![]() This tool created a window on top of your screen you can move around (so it’s easier to screenshot than Oracle). Sim Daltonism is a Mac tool to simulate different types of colorblindness. Then, you can use color blindness simulators to check your color choice against different types of color blindness.Ĭolor Oracle is a free colorblind simulator that works for Windows, Mac and Linux. Also, product colors pickers if you are doing an e-commerce website (more about that in the articles in next section). Forms, infographics, graphs, tags, statuses are usually a good place to start. You can of course start by checking your mockups and hunt down any places where this criteria can be applied. The first criteria is about making sure that the information isn’t only conveyed by color. Don’t worry, I have a selection of tools and resources to help you get started with inclusive design and color accessibility. Okay, so now you might wonder “but how am I supposed to measure this 4.5 or 3 contrast ratio, do I need to do maths for each color combination?!”. ![]() Note that this doesn’t apply to purely decorative elements and inactive states. This applies to icons, charts, buttons, hover, focus and active states, interactive components, form inputs, etc. graphical objects and user interface components that needs to be identified by the user must have a contrast ratio of at least 3:1 with adjacent colors.The contrast ratio rule also applies to non text elements : Non-text elements to adjascent minimum contrast ratio The conversion points > pixels isn’t super simple but if you want more details you can check Understanding Success Criterion 1.4.3: Contrast (Minimum)īasically: small text under 24px (or bold text under 19px) need to follow the 4.5 rule, bigger text over 24px (or bold text over 19px) need to follow the 3.0 ratio rule. Note that decorative graphics and text part of logos don’t need to meet those criteria. 3:1 for text bigger than 24px /18 points or bold text bigger than 19px /14.4.5:1 for text smaller than 24px /18 points or bold text smaller than 19px /14.There’s more example on the Understanding Success Criterion 1.4.1: Use of Color page.įor the second criteria, it means that the contrast between text (or foreground elements) and color should be: If you have a form, you can’t just use a red border to show there’s an error. Text against background minimum contrast ratioįor the first criteria, it means for instance that if you create a graph, you should have some secondary way of helping people understand the different sections. Ensure sufficient contrast ratio between foreground (text or icons but this also now applied to form borders and other elements) and their background.Don’t use color as the only visual means of conveying an information, action, etc.So for inclusivity, accessibility and colors, there’s 2 big things you need to remember: In this big list, the 1.4 section is dedicated to “making it easier for users to see and hear content including separating foreground from background.” Those look scary, a little bit like the HTML specification, I know. For this small introduction, I will stick to the AA criteria. What you need to understand about accessibility is that there’s a list of criterion you can find under the WCAG 2.1 guidelines to help you. ![]() I will not enter in all the details since I’m no accessibility expert. This is why you need to be careful about accessibility when you are using color in your products. Some users might be color blind, some users might be visually impaired, some users might be in different environments. Unfortunately, not everybody gets to experience colors the same way. The color can convey your brand identity, help users understand information, etc. Color choice is all about communication and is usually a decision marketing and visual design sometimes fight over. ![]() When building products with diversity in mind (digital ones but this could also apply to other products), color choice is important. ** Cet article existe aussi en Français ** Contrasts and accessibility: a few basics on color I will keep on updating this article with new resources regularly. So I thought I would share the resources, tips and tools I regularly use to build and check the color accessibility of my products in one single place for future reference. It brought up some interesting discussions on color accessibility, inclusive design an interesting discussion about the use of emojis.Ī few people asked me for advice on how to chose accessible color palettes for their projects. I wrote a quick tweet about teaching the basics of accessibility and colors to design students a few months ago that go quite some attention. Remember that the following content might be outdated.
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