Christian Lawson-Perfect<p>Yesterday <span class="h-card" translate="no"><a href="https://mathstodon.xyz/@peterrowlett" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@<span>peterrowlett</span></a></span> asked me if I'd made a tool for simulating colour vision deficiency and I thought "yeah, that's totally the kind of thing I would have done".</p><p>Well, if I had done it, I can't find it now. So I spent an hour this morning making one:</p><p><a href="https://cvd-simulator.think.somethingorotherwhatever.com/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">cvd-simulator.think.somethingo</span><span class="invisible">rotherwhatever.com/</span></a></p><p>I used the same method that Firefox's dev tools uses to simulate colour vision deficiency: multiply each pixel's (R,G,B) vector by a matrix representing the eye's response in each kind of colour receptor.</p><p><a href="https://mathstodon.xyz/tags/accessibility" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>accessibility</span></a> <a href="https://mathstodon.xyz/tags/ColourVisionDeficiency" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ColourVisionDeficiency</span></a></p>