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gatsby-image
Advanced tools
Lazy-loading React image component with optional support for the blur-up effect.
Speedy, optimized images without the work.
gatsby-image
is a React component specially designed to work seamlessly with Gatsby's GraphQL queries. It combines Gatsby's native image processing capabilities with advanced image loading techniques to easily and completely optimize image loading for your sites.
Large, unoptimized images dramatically slow down your site.
But creating optimized images for websites has long been a thorny problem. Ideally you would:
Doing this consistantly across a site feels like sisyphean labor. You manually optimize your images and then… several images are swapped in at the last minute or a design-tweak shaves 100px of width off your images.
Most solutions involve a lot of manual labor and bookkeeping to ensure every image is optimized.
This isn't ideal. Optimized images should be easy and the default.
With Gatsby, we can make images way way better.
gatsby-image
is designed to work seamlessly with Gatsby's native image processing capabilities powered by GraphQL and Sharp. To produce
perfect images, you need only:
gatsby-image
and use it in place of the built-in img
gatsby-image
.The GraphQL query creates multiple thumbnails with optimized JPEG and PNG compression. The gatsby-image
component automatically sets up the "blur-up" effect as well as lazy loading of images further down the screen.
This is what a component using gatsby-images
looks like.
import React from 'react'
import Img from 'gatsby-image'
export default ({ data }) => (
<div>
<h1>Hello gatsby-image</h1>
<Img resolutions={data.file.childImageSharp.resolutions} />
</div>
)
export const query = graphql`
query GatsbyImageSampleQuery {
file(relativePath: { eq: "blog/avatars/kyle-mathews.jpeg"}) {
childImageSharp {
# Specify the image processing steps right in the query
# Makes it trivial to update as your page's design changes.
resolutions(width: l25, height: 125) {
...GatsbyImageSharpResolutions
}
}
}
}
`
There are two types of responsive images supported by gatsby-image.
In the first scenario, you want to vary the image's size for different screen resolutions -- in other words, create retina images.
For the second scenario, you want to create multiple sizes of thumbnails for devices with widths stretching from smartphone to wide desktop monitors.
To decide between the two, ask yourself: "do I know the exact size this image will be?" If yes, it's the first type. If no and its width and/or height need to vary depending on the size of the screen, then it's the second type.
In Gatsby's GraphQL implementation, you query for the first type by querying a child object of an image called resolutions
— which you can see in the sample component above. For the second type, you do a similar query but for a child object called sizes
.
GraphQL includes a concept called "query fragments". Which, as the name suggests, are a part of a query that can be used in multiple queries. To ease building with gatsby-image
, Gatsby image processing plugins which support gatsby-image
ship with fragments which you can easily include in your queries.
Note, due to a limitation of GraphiQL, you can not currently use these fragments in the GraphiQL IDE.
Plugins supporting gatsby-image
currently include gatsby-transformer-sharp and gatsby-source-contentful.
Their fragments are:
GatsbyImageSharpResolutions
GatsbyImageSharpResolutions_noBase64
GatsbyImageSharpSizes
GatsbyImageSharpSizes_noBase64
GatsbyContentfulResolutions
GatsbyContentfulResolutions_noBase64
GatsbyContentfulSizes
GatsbyContentfulSizes_noBase64
If you don't want to use the blur-up effect, choose the fragment with noBase64
at the end.
Pass in the data returned from the resolutions
object in your query via the resolutions
prop. e.g. <Img resolutions={resolutions} />
{
imageSharp {
# Other options include height (set both width and height to crop),
# grayscale, duotone, rotate, etc.
resolutions(width: 400) {
# Choose either the fragment including a small base64ed image or one without.
...GatsbyImageSharpResolutions
}
}
}
Pass in the data returned from the sizes
object in your query via the sizes
prop. e.g. <Img sizes={sizes} />
{
imageSharp {
# i.e. the max width of your container is 700 pixels.
#
# Other options include maxHeight (set both maxWidth and maxHeight to crop),
# grayscale, duotone, rotate, etc.
sizes(maxWidth: 700) {
# Choose either the fragment including a small base64ed image or one without.
...GatsbyImageSharpSizes_noBase64
}
}
}
gatsby-image
propsName | Type | Description |
---|---|---|
resolutions | object | Data returned from the resolutions query |
sizes | object | Data returned from the sizes query |
fadeIn | bool | Defaults to fading in the image on load |
title | string | Passed to the img element |
alt | string | Passed to the img element |
className | `string | object` |
outerWrapperClassName | `string | object` |
style | object | Spread into the default styles in the wrapper div |
position | string | Defaults to relative . Pass in absolute to make the component absolute positioned |
backgroundColor | `string | bool` |
display: none;
on a component using a resolutions
prop, you need to also pass in to the style prop { display: 'inherit' }
.* Images don't load until JavaScript is loaded. Gatsby's automatic code splitting generally makes this fine but if images seem slow coming in on a page, check how much JavaScript is being loaded there.FAQs
Lazy-loading React image component with optional support for the blur-up effect.
The npm package gatsby-image receives a total of 8,681 weekly downloads. As such, gatsby-image popularity was classified as popular.
We found that gatsby-image demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 19 open source maintainers collaborating on the project.
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