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HTML

              
                <h1>Access image colors as metadata in <a href="https://sanity.io/?utm_source=css-tricks&utm_campaign=csstricks">sanity.io</a></h1>
<p>With image colors as metadata you can decide which contrast color for overlaying text. You can also use the color palette for other parts of your design.</p>
<div id="app">
  <span id="loading">Loading...</span>
</div>
<footer>
  <p>This is a demo using structured content in <a href="https://sanity.io/?utm_source=css-tricks&utm_campaign=csstricks">sanity.io</a></p>
  <p>Photos from <a href="https://unsplash.com">unsplash.com</a></p>
</footer>
              
            
!

CSS

              
                :root {
  --primary-color: #aef;
  --background-color: #1d1e22;
  --border-radius: 3px;
}
body {
  padding: 1em;
  background: var(--background-color);
  color: #fff;
}
a {
  color: var(--primary-color);
}
pre {
  font-size: 11px;
  overflow: auto;
  white-space: pre-wrap;
  overflow-wrap: break-word;
}

img {
  width: 100%;
}

button {
  position: relative;
  font-size: 1em;
  display: inline-block;
  padding: 0.5em;
  border: 2px solid currentColor;
  background-color: #fff;
  margin-top: 1em;
  border-radius: var(--border-radius);
}

.metadata {
  background: #fff;
  color: black;
  width: auto;
  margin: 1em;
  padding: 1em;
  top: 1em;
}

.container {
  display: flex;
  flex-wrap: wrap;
}

.card {
  background-color: #fff;
  color: #000;
  flex-basis: 30%;
  margin: 3px;
  padding: 5px;
  border-radius: var(--border-radius);
}
@media only screen and (max-width: 600px) {
  .card {
      flex-basis: 100%;
  }
}
figure {
  margin: 0;
  display: block;
  position: relative;
}
.figure__overlay {
  position: absolute;
  text-transform: uppercase;
  font-weight: bold;
  font-size: 10vw;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.ReactModal__Overlay--after-open {
  overflow: hidden;
  position: fixed;
  width: 100%;
  height: 100%;
  max-height: 100vh;
  overflow-y: auto
}
              
            
!

JS

              
                ReactModal.setAppElement('#app')

const client = SanityClient({
  projectId: "anokeucs",
  dataset: "production",
  useCdn: true
})
const query = `*[_type == 'post' && defined(mainImage)]{ 
    ...,
    "mainImage": mainImage.asset->
  }`

class ImageExample extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      result: [],
      showModal: ''
    }
    this.openDialog = this.openDialog.bind(this)
    this.closeDialog = this.closeDialog.bind(this)
  }
  openDialog(_id) {
    this.setState({ showModal: _id })
  }
  closeDialog(_id) {
    this.setState({ showModal: '' })
  }

  componentDidMount() {
    client.fetch(query).then((result = []) => this.setState({ result }))
  }
  render() {
    const { result = [] } = this.state
    if (!result.length) return <div>Loading...</div>
    return (
      <div className="container">
        {result.map(({ _id, mainImage }) => (
          <div
            key={_id}
            className="card"
            style={{
              backgroundColor: mainImage.metadata.palette.dominant.background,
              color: mainImage.metadata.palette.dominant.foreground
            }}
          >
            <figure>
              <img src={`${mainImage.url}?w=800`} />
              <div className="figure__overlay">
                {mainImage.metadata.palette.dominant.foreground}
              </div>
            </figure>
            <button onClick={() => this.openDialog(_id)}>
              Inspect metadata
            </button>
            <ReactModal
              isOpen={this.state.showModal === _id}
              contentLabel="Minimal Modal Example"
              id={_id}
              OnAfterClose={() => document.body.style.overflow = 'hidden' }
OnRequestClose={() => document.body.removeAttribute('style') }
              className="metadata"
            >
              <button onClick={() => this.closeDialog(_id)}>Close</button>

              <pre>{JSON.stringify(mainImage, null, 2)}</pre>
            </ReactModal>
          </div>
        ))}
      </div>
    )
  }
}

ReactDOM.render(<ImageExample />, document.getElementById("app"))

              
            
!
999px

Console