#Picture Optimization

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frosty kite
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Please tell me about best code including picture in mdx file.

tall adderBOT
#

Hi @frosty kite. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

#

To achieve optimal picture optimization in an Astro MDX file, you should use Astro’s built-in <Picture /> component. This component allows you to generate a <picture> tag with multiple formats (such as avif, webp, and a fallback like png), which provides the best performance and compatibility for your images.

Here’s the best practice code for including and optimizing a picture in an .mdx file:

---
import { Picture } from 'astro:assets';
import myImage from '../assets/my_image.png'; // Adjust the path as needed
---

<Picture
  src={myImage}
  formats={['avif', 'webp']}
  alt="A description of my image."
/>
  • The formats prop specifies the output formats for the image, with the most modern format listed first for best performance.
  • The alt attribute is required for accessibility.
  • You can also use additional props for responsive images or to further customize the output.

This approach ensures your images are optimized at build time (or on-demand for SSR), and the resulting HTML will include multiple sources for the browser to choose the best format available Astro components for images <Picture /> Reference.

Note: The <Picture /> component is available in .mdx files, but not in standard .md files. For .md files, use the standard Markdown image syntax, which will also be optimized if the image is stored in src/ Images in MDX files.

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#

@frosty kite Kapa.ai is still learning and improving, please let me know how I did by reacting below.

frosty kite
#

I will use jpeg format. Also best using Picture component?

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@tall adder I will use jpeg format. Also best using Picture component?

tall adderBOT
#

Let me check the knowledge base for you again. One moment! :books:

#

Yes, using the <Picture /> component is the best way to optimize images in Astro, including JPEGs, when working in .mdx files. The <Picture /> component allows you to specify multiple output formats (such as webp and avif for modern browsers, plus jpg as a fallback), ensuring optimal performance and compatibility.

Here’s how you can use the <Picture /> component with a JPEG image in an .mdx file:

---
import { Picture } from 'astro:assets';
import myPhoto from '../assets/my_photo.jpg'; // Adjust the path as needed
---

<Picture
  src={myPhoto}
  formats={['avif', 'webp']}  // Modern formats for best performance
  fallbackFormat="jpg"        // Ensures JPEG is used as a fallback
  alt="A description of my photo."
/>
  • The formats prop lists the modern formats you want to generate.
  • The fallbackFormat="jpg" ensures that the final <img> tag uses JPEG as the fallback, which is ideal for browsers that do not support newer formats.
  • The alt attribute is required for accessibility.

This approach will generate a <picture> element with multiple <source> tags for the specified formats and a fallback <img> in JPEG format, providing both optimization and broad browser support <Picture /> Reference Images in MDX files.

So, for JPEG images, the <Picture /> component is indeed the best and recommended way to optimize and serve your images in Astro MDX files.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@frosty kite Kapa.ai is still learning and improving, please let me know how I did by reacting below.

frosty kite
#

I want to serve some picture at the same time.
But only picture component will not optimize pic size.

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@tall adder
I want to serve some picture at the same time.
But only picture component will not optimize pic size.

tall adderBOT
#

Let me check the knowledge base for you again. One moment! :books:

#

You are correct that the <Picture /> component in Astro is designed to optimize images and serve multiple formats and sizes, but the actual optimization (such as generating responsive image sizes) depends on how you configure and use the component.

To ensure that your pictures are optimized for different sizes (responsive images), you should use the responsive image properties with the <Picture /> component, such as the layout, width, and height props. When you set a layout (like "constrained" or "full-width"), Astro will automatically generate multiple image sizes and the appropriate srcset and sizes attributes for responsive loading. This ensures that the browser downloads the most appropriate image size for the user's device, optimizing both performance and bandwidth.

Example: Serving an optimized, responsive picture in MDX

---
import { Picture } from 'astro:assets';
import myPhoto from '../assets/my_photo.jpg';
---

<Picture
  src={myPhoto}
  formats={['avif', 'webp']}
  fallbackFormat="jpg"
  alt="A description of my photo."
  layout="constrained"
  width={800}
  height={600}
/>
  • The layout="constrained" prop enables responsive image generation.
  • width and height define the maximum display size and help Astro generate the correct srcset and sizes.
  • This setup ensures your image is optimized and responsive, not just format-optimized.

If you omit the layout prop, the <Picture /> component will not generate responsive images by default, and only a single size will be served Responsive image properties Responsive image behavior.

#

Summary:
To serve multiple optimized picture sizes at the same time, use the <Picture /> component with the layout, width, and height props. This will ensure Astro generates and serves responsive, optimized images for your users.

If you need to serve different images for different breakpoints (e.g., mobile vs. desktop), you can create a custom component using the getImage() function and <picture> element, as shown in the custom image component recipe.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: