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gatsby-remark-images

Processes images in markdown so they can be used in the production build.

In the processing, it make images responsive by:

  • Adding an elastic container to hold the size of the image while it loads to avoid layout jumps.
  • Generating multiple versions of images at different widths and sets the srcset and sizes of the img element so regardless of the width of the device, the correct image is downloaded.
  • Using the ā€œblur upā€ technique popularized by Medium and Facebook where a small 20px wide version of the image is shown as a placeholder until the actual image is downloaded.

Install

npm install --save gatsby-remark-images gatsby-plugin-sharp

How to use

// In your gatsby-config.js
plugins: [
  `gatsby-plugin-sharp`,
  {
    resolve: `gatsby-transformer-remark`,
    options: {
      plugins: [
        {
          resolve: `gatsby-remark-images`,
          options: {
            // It's important to specify the maxWidth (in pixels) of
            // the content container as this plugin uses this as the
            // base for generating different widths of each image.
            maxWidth: 590,
          },
        },
      ],
    },
  },
];

Options

Name Default Description
maxWidth 650 The maxWidth in pixels of the div where the markdown will be displayed. This value is used when deciding what the width of the various responsive thumbnails should be.
linkImagesToOriginal true Add a link to each image to the original image. Sometimes people want to see a full-sized version of an image e.g. to see extra detail on a part of the image and this is a convenient and common pattern for enabling this. Set this option to false to disable this behavior.
showCaptions false Add a caption to each image with the contents of the title attribute, when this is not empty. Set this option to true to enable this behavior.
sizeByPixelDensity false Analyze imagesā€™ pixel density to make decisions about target image size. This is what GitHub is doing when embedding images in tickets. This is a useful setting for documentation pages with a lot of screenshots. It can have unintended side effects on high pixel density artworks.

Example: A screenshot made on a retina screen with a resolution of 144 (e.g. Macbook) and a width of 100px, will be rendered at 50px.
wrapperStyle Add custom styles to the div wrapping the responsive images. Use the syntax for the style attribute e.g. margin-bottom:10px; background: red;
backgroundColor white Set the background color of the image to match the background image of your design

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