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CharisandChris Chinchilla
47705a8968
* fix: rewrite relative URLs when syncing to GitHub discussion Relative URLs back to supabse.com won't work in GitHub discussions, so rewrite them back to absolute URLs starting with https://supabase.com * fix: replace all supabase urls with relative urls * chore: add linting for relative urls * chore: bump linter version * Prettier --------- Co-authored-by: Chris Chinchilla <chris.ward@supabase.io>
79 lines
2.3 KiB
Plaintext
79 lines
2.3 KiB
Plaintext
---
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title: 'Image Manipulation'
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description: 'How to optimize and transform images using Edge Functions.'
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---
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Supabase Storage has [out-of-the-box support](/docs/guides/storage/serving/image-transformations?queryGroups=language&language=js) for the most common image transformations and optimizations you need.
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If you need to do anything custom beyond what Supabase Storage provides, you can use Edge Functions to write custom image manipulation scripts.
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In this example, we will use [`magick-wasm`](https://github.com/dlemstra/magick-wasm) to perform image manipulations. `magick-wasm` is the WebAssembly port of the popular ImageMagick library and supports processing over 100 file formats.
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<Admonition type="caution">
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Edge Functions currently doesn't support image processing libraries such as `Sharp`, which depend on native libraries. Only WASM-based libraries are supported.
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</Admonition>
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### Prerequisites
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Make sure you have the latest version of the [Supabase CLI](/docs/guides/cli#installation) installed.
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### Create the Edge Function
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Create a new function locally:
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```bash
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supabase functions new image-blur
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```
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### Write the function
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In this example, we are implementing a function allowing users to upload an image and get a blurred thumbnail.
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Here's the implementation in `index.ts` file:
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<$CodeSample
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path="edge-functions/supabase/functions/image-manipulation/index.ts"
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lines={[[1, -1]]}
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/>
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### Test it locally
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You can test the function locally by running:
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```bash
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supabase start
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supabase functions serve --no-verify-jwt
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```
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Then, make a request using `curl` or your favorite API testing tool.
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```bash
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curl --location '<http://localhost:54321/functions/v1/image-blur>' \\
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--form 'file=@"/path/to/image.png"'
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--output '/path/to/output.png'
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```
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If you open the `output.png` file you will find a transformed version of your original image.
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### Deploy to your hosted project
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Now, let's deploy the function to your Supabase project.
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```bash
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supabase link
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supabase functions deploy image-blur
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```
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<Admonition type="caution">
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Hosted Edge Functions have [limits](/docs/guides/functions/limits) on memory and CPU usage.
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If you try to perform complex image processing or handle large images (> 5MB) your function may return a resource limit exceeded error.
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</Admonition>
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