Modern CSS Filter Effects
Grayscale, blur, hue, sepia, duotone and glow filters for photos, logos, icons and text.
1Hue Rotation
Continuously cycles the colours of a gradient, illustration or image through the colour wheel. Class: fx-hue-rotation
<div class="d-flex flex-wrap align-items-center justify-content-center gap-3 p-3 h-100" style="min-height:200px">
<div class="fx-hue-rotation rounded-circle" style="width:96px;height:96px;background:linear-gradient(135deg, var(--wt-primary), var(--wt-accent))">
</div>
<img src="https://images.unsplash.com/photo-1554366347-897a5113f6ab?auto=format&fit=crop&w=1200&h=800&q=70" alt="Photo cycling through hues" class="fx-hue-rotation object-fit-cover rounded-3" style="width:150px;height:110px">
</div>
/* CSS (already in assets/css/effects.css) */
.fx-hue-rotation { animation: fx-hue-rotation-hue 8s linear infinite; }
@keyframes fx-hue-rotation-hue { to { filter: hue-rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
.fx-hue-rotation, .fx-hue-rotation::before, .fx-hue-rotation::after, .fx-hue-rotation *, .fx-hue-rotation *::before, .fx-hue-rotation *::after { animation: none !important; transition: none !important; }
}2Duotone Effect
Turns any photo into a two-colour print in the theme colours; put the class on a wrapper around the img. Class: fx-duotone-effect
<div class="d-flex flex-wrap align-items-center justify-content-center gap-3 p-3 h-100" style="min-height:200px">
<figure class="fx-duotone-effect rounded-3 mb-0">
<img src="https://images.unsplash.com/photo-1606922183036-62e19495eaab?auto=format&fit=crop&w=1200&h=800&q=70" alt="Duotone photo" class="object-fit-cover" style="width:210px;height:145px">
</figure>
</div>
/* CSS (already in assets/css/effects.css) */
.fx-duotone-effect { position: relative; display: inline-block; overflow: hidden; isolation: isolate; background: var(--wt-accent); }
.fx-duotone-effect img { display: block; filter: grayscale(1) contrast(1.2) brightness(1.1); mix-blend-mode: multiply; transition: filter .5s; }
.fx-duotone-effect::after {
content: ""; position: absolute; inset: 0; pointer-events: none;
background: var(--wt-primary); mix-blend-mode: lighten; transition: opacity .5s;
}
.fx-duotone-effect:hover::after { opacity: 0; }
.fx-duotone-effect:hover img { filter: grayscale(0); mix-blend-mode: normal; }
@media (prefers-reduced-motion: reduce) {
.fx-duotone-effect, .fx-duotone-effect::before, .fx-duotone-effect::after, .fx-duotone-effect *, .fx-duotone-effect *::before, .fx-duotone-effect *::after { animation: none !important; transition: none !important; }
}