Expose erode and dilate operations #4243

docs/public/humans.txt

@@ -314,3 +314,6 @@ GitHub: https://github.com/happycollision
 
 Name: Florent Zabera
 GitHub: https://github.com/florentzabera
+
+Name: Quentin Pinçon
+GitHub: https://github.com/qpincon

docs/src/content/docs/api-operation.md

@@ -284,6 +284,52 @@ const gaussianBlurred = await sharp(input)
 ```
 
 
+## dilate
+> dilate([width]) ⇒ <code>Sharp</code>
+
+Expand foreground objects using the dilate morphological operator.
+
+
+**Throws**:
+
+- <code>Error</code> Invalid parameters
+
+
+| Param | Type | Default | Description |
+| --- | --- | --- | --- |
+| [width] | <code>Number</code> | <code>1</code> | dilation width in pixels. |
+
+**Example**  
+```js
+const output = await sharp(input)
+  .dilate()
+  .toBuffer();
+```
+
+
+## erode
+> erode([width]) ⇒ <code>Sharp</code>
+
+Shrink foreground objects using the erode morphological operator.
+
+
+**Throws**:
+
+- <code>Error</code> Invalid parameters
+
+
+| Param | Type | Default | Description |
+| --- | --- | --- | --- |
+| [width] | <code>Number</code> | <code>1</code> | erosion width in pixels. |
+
+**Example**  
+```js
+const output = await sharp(input)
+  .erode()
+  .toBuffer();
+```
+
+
 ## flatten
 > flatten([options]) ⇒ <code>Sharp</code>
 

docs/src/content/docs/changelog.md

@@ -45,6 +45,10 @@ Requires libvips v8.16.1
   [#4207](https://github.com/lovell/sharp/pull/4207)
   [@calebmer](https://github.com/calebmer)
 
+* Expose erode and dilate operations.
+  [#4243](https://github.com/lovell/sharp/pull/4243)
+  [@qpincon](https://github.com/qpincon)
+
 * Add support for RGBE images. Requires libvips compiled with radiance support.
   [#4316](https://github.com/lovell/sharp/pull/4316)
   [@florentzabera](https://github.com/florentzabera)